WO2000077652A9 - Sequenz-partitionierung auf zellstrukturen - Google Patents
Sequenz-partitionierung auf zellstrukturenInfo
- Publication number
- WO2000077652A9 WO2000077652A9 PCT/DE2000/001869 DE0001869W WO0077652A9 WO 2000077652 A9 WO2000077652 A9 WO 2000077652A9 DE 0001869 W DE0001869 W DE 0001869W WO 0077652 A9 WO0077652 A9 WO 0077652A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- memory
- cell structure
- data
- sequencer
- configuration
- Prior art date
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/76—Architectures of general purpose stored program computers
- G06F15/80—Architectures of general purpose stored program computers comprising an array of processing units with common control, e.g. single instruction multiple data processors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/76—Architectures of general purpose stored program computers
- G06F15/78—Architectures of general purpose stored program computers comprising a single central processing unit
- G06F15/7867—Architectures of general purpose stored program computers comprising a single central processing unit with reconfigurable architecture
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/40—Transformation of program code
- G06F8/41—Compilation
- G06F8/43—Checking; Contextual analysis
- G06F8/433—Dependency analysis; Data or control flow analysis
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/40—Transformation of program code
- G06F8/41—Compilation
- G06F8/45—Exploiting coarse grain parallelism in compilation, i.e. parallelism between groups of instructions
Definitions
- the present invention extends to the field of programmable and, in particular, reprogrammable arithmetic and / or logic modules (VPUs) with a large number of arithmetic and / or logic units, the interconnection of which is also programmable and reprogrammable during operation.
- VPUs reprogrammable arithmetic and / or logic modules
- Such logic modules are available from various companies under the generic term FPGA.
- FPGA field-programmable arithmetic and / or logic modules
- All of the modules described have a two-dimensional or multidimensional arrangement of logical and / or arithmetic units (PAEs), which can be interconnected via bus systems.
- PEEs logical and / or arithmetic units
- the object of the invention is to provide a programming method which enables the described modules to be programmed efficiently in common high-level languages and at the same time the advantages of the parallelism of the described ones, which results from the large number of units Use blocks largely automatically, completely and efficiently.
- WHILE loops (0203) do not have a constant termination value. Rather, a condition evaluates when the loop is aborted. Therefore, when the loop breaks, it is usually not known (if the condition is not constant) at synthesis time. Due to the dynamic behavior, synthesis tools cannot permanently map these loops to hardware, i.e. be transferred to a target block.
- recursions cannot be mapped to hardware using prior art synthesis tools if the depth of recursion is not known at the time of synthesis and is therefore constant. With recursion, new resources are allocated with each new recursion level. This would mean that new hardware must be made available with each recursion level, but this is not dynamically possible.
- Simple time dependencies (0301) are not partitioned into several sub-applications by today's synthesis tools and are therefore only transferable as a whole to a target module.
- Conditional executions (0302) and loops via conditions (0303) can also only be mapped if sufficient resources exist on the target block.
- An essential step in the method according to the invention is the partitioning of graphs (applications) into time-independent subgraphs (subapplications).
- a status signal (trigger, see PACT08) can be generated, which prompts the higher-level loading unit to reload the next partial application.
- PACT08 a status signal
- the trigger can always be generated if the register is written to.
- memories i.b. from those that work according to the FIFO principle, the generation of the trigger depends on several conditions. For example, the following conditions can generate a trigger individually or in combination:
- a partial application is also called a module in the following, in order to increase intelligibility from the perspective of classic programming.
- signals are as follows also called variables. These variables differ from conventional variables in one respect: Each variable is assigned a status signal (ready), which indicates whether this variable has a valid value. If a signal has a valid (calculated) value, the status signal is ready; if the signal has no valid value (calculation not yet completed), the status signal is Not_Ready. The principle is described in detail in patent application P196 51 075.9.
- WHILE termination criteria of loops
- recursions as well as conditional jumps in partial applications are implemented by triggers.
- case 1 the triggers are exchanged between PAEs
- case 2 the triggers are sent from the PAEs to the CT. It is essential to the invention that the transition between cases 1 and 2 essentially depends on the number of current partial applications in the matrix of PAEs. In other words, triggers are sent to the subapplications that are currently running on the PAEs. If a partial application is not configured, the triggers are sent to the CT. It is important to note that if this sub-application were also configured, the corresponding triggers would be sent directly to the corresponding PAEs.
- a suitable hardware architecture makes it possible to overlap several modules. That Several modules are pre-configured in the PAEs at the same time and it is possible to switch between the configurations with a minimum of time, so that exactly one configuration is activated from a number of several configurations per PAE.
- part of the set can be activated with part of A and another part of the set with part B at the same time.
- the separation of the two parts is exactly given by the PAE, in which the switchover state between A and B occurs. This means that, starting from a certain point in time, all PAEs in which A was activated for execution before this point in time, B t is activated and is still activated in A in all other PAEs after this point in time. With increasing time, more and more PAEs B are activated.
- the switchover takes place on the basis of certain data, states which result from the calculation of the data or on the basis of any other events which are generated, for example, from external sources or from the CT.
- a signal (RECONFIG-TRIGGER) can be sent to the CT, which causes the CT to preload new configurations.
- the preloading on others can depend on the current data processing or independent PAEs.
- WRC wave reconfiguration
- a data packet runs into the PAE1.
- the PAE has 4 possible configurations (A, F, H, C), which can be selected using suitable hardware (see Fig. 10/11).
- the configuration F is activated in PAE1 for the current data packet (shown hatched).
- the data package runs according to PAE2 and a new data package appears in PAE1.
- F is also active in PAE2.
- An event (Tl) appears with PAEl together with the data packet. The result arises from the occurrence of any event from outside the PAE (e.g. a status flag -Qdar_Erl ⁇ qers) or is generated within the PAE by the calculation performed.
- Fig. 13c the configuration H is activated in PAE1 due to the event (tl), at the same time a new event (t2) appears, which in the next cycle (Fig. 13d) causes configuration A to be activated.
- Fig. 13e T3 at PAE1, which causes F to be overwritten with G (Fig. 13f).
- T4 arrives, G is activated (Fig. 13g).
- (t ⁇ ) causes K to load instead of C (Fig. 13h, i) and (t ⁇ ) loads and starts F instead of H (Fig. 13j).
- FIGS. 13g *) to 13j *) illustrate that not all PAEs have to work according to the same pattern when going through a wave reconfiguration. How a PAE is configured by a wave reconfiguration depends in principle on its own configuration. It should be shown here that PAE4 to PAE6 are configured in such a way that they react differently to the events than the other PAEs. For example, in Fig. 13g *) not A but H is activated due to event T2 (cf. Fig. 13g). The same applies to 13h *). Due to event T3, G is not loaded in FIG. 13i *), but configuration F remains and A remains activated. In Fig. 13j *) it is indicated at PAE7 that event T3 will trigger the loading of G again. In PAE4, event T activates F instead of configuration G (see FIG. 13j).
- a wave of reconfigurations due to events moves through a set of PAEs that can be 2-dimensional or multi-dimensional.
- the graphs shown in the following figures always have a module as a graph node, it being assumed that several modules can be mapped to a target module. This means that although all modules are independent of one another in time, only the modules are reconfigured and / or a data memory is inserted which is marked with a vertical line and ⁇ t. This point is called the U configuration time.
- the time of reconfiguration depends on the specific data or the states that result from the processing of the specific data.
- the reconfiguration times are positioned according to the resources of the target modules. This gives the graph length any scaling.
- Modules can be configured overlaid.
- the reconfiguration of modules is controlled by the data itself or the result of the processing of the data.
- the data generated by the modules are stored and the modules following in time read the data from this memory and in turn save the results in a memory or output the final result to the periphery.
- the status registers of the individual cells are made available to all other arithmetic units via a status bus system (0802), which can be freely routed and segregated in addition to the data bus (0801) (Fig. 8b).
- a status bus system 802
- FIG. 8a In order to clarify the difference to existing parallel computer systems, the prior art is given in FIG. 8a. There is one
- the processors are connected to one another via a common data bus (0803). There is no explicit bus system for the synchronous exchange of data and status.
- the network of status signals (0802) provides a freely and deliberately distributed status register of a single conventional processor (or of several processors of an SMP computer).
- the status of each individual ALU (or each individual processor) and in particular each individual information of the status is available in each case to the ALU (s) (processors) which require the information.
- VPUs basically allows the construction of any complex sequencers from individual PAEs. That means:
- the data flow can represent the calculation steps of the algorithm exactly by appropriate configuration.
- VPUs which in particular also corresponds to the sequential requirements of an algorithm.
- the main advantage of the VPU architecture is that an algorithm can be broken up by a compiler so that the data flow parts are extracted by an "optimal" data flow represented by configuring an adapted data flow AND the sequential parts of the algorithm by an "optimal" sequencer can be represented by configuring a customized sequencer.
- sequencers and data flows can be accommodated on one VPU at the same time, depending solely on the available resources.
- State information of the machine model (MACHINE-STATE). This status information is only valid within the processing of a specific module and is only used locally in the sequencers and data flow units of this specific module. This means that these MACHINE-STATEs represent the states that run concealed within the hardware in state-of-the-art processors, are implicit in the instructions and the processing steps and, after an instruction has expired, contain no further information for subsequent instructions. Such conditions do not need to be saved. The condition for this is that interrupts only after complete execution of all currently active modules.
- All relevant and later required status information is transferred from one module to the next, as is often implemented as standard in pipelines.
- the status information is then implicitly stored in a memory together with the data, so that the statuses are simultaneously available when the data is called up.
- An explicit handling of the status information ib by means of PUSH and POP is thus omitted, which, depending on the algorithm, on the one hand leads to a substantial acceleration of the processing and on the other hand to simplified programming.
- the status information can either be saved with the respective data packet or only in the case of an interrupt can be saved and specially marked.
- the address of at least one of the operands of the data packet being processed together with the data packet may be useful to pass the address of at least one of the operands of the data packet being processed together with the data packet through the PAEs.
- the address is not modified, but is available as a pointer to the last operands processed when the data packet is written to RAM. This pointer can either be saved with the respective data packet, or only saved and specially marked in the event of an interrupt.
- all pointers to the operands can be calculated by an address (or a group of addresses), it makes sense to save only one address (or a group of addresses).
- the virtual machine model serves as the basis.
- the array of PAEs (PA) is regarded as an arithmetic unit that can be configured in terms of its architecture.
- the CT (s) represent a loading unit (LOAD-UNIT) for opcodes.
- the IOAG (s) take over the bus interface and / or the register set.
- a group of PAEs (which can also be a PAE) is configured to execute a complex command or command sequence and then the data relating to this command (which can also be a single data word) are processed. Then this group is reconfigured to process the next command.
- the size and arrangement of the group can change. According to the partitioning technologies already discussed, it is up to the compiler to create optimal groups.
- An instruction word corresponds to a module. Several modules can be processed at the same time, provided that the dependency of the data permits and sufficient resources are free on the block.
- the next instruction word is usually loaded immediately after execution of the instruction word. For time optimization, it is possible to preload the next instruction word already during execution (see FIG. 10). If there are several possible next instruction words, several can be preloaded and the correct instruction word is selected, for example by a trigger signal, before execution (see FIG. 4a B1 / B2, FIG. 15 ID C / ID K, FIG. 36 A / B / C)
- a group of PAEs (which can also be a PAE) is configured to execute a frequently used command sequence.
- the data which can also be a single data word, are fed to the group and the group if required receive.
- This group remains over a large number of cycles without reconfiguration.
- This arrangement is comparable to a special arithmetic unit in a processor according to the prior art (for example MMX), which is intended for special tasks and is used only when required.
- PACT02 describes an RDY / ACK standard protocol which describes the essential requirements according to the synchronization of DE 44 16 881 with regard to a typical one
- REQ / ACK data is available at the sender for the recipient
- REQ data is requested from the recipient at the sender ACK: general confirmation for receiving or sending
- Speichermodel1 Memory (one or more) can be integrated in VPUs, which are addressed similarly to a PAE.
- a memory model is described below, which at the same time represents an interface to external peripherals and / or external memory:
- a VPU-internal memory with PAE-like bus functions can represent different memory modes:
- a controllable interface is assigned to the memory
- Memory areas either write or read in words or blocks.
- the interface can be used here, but it is not absolutely necessary if the data e.g. are only used locally in the VPU and the storage space of an internal memory is sufficient.
- a simple stack processor can be built using the REQ / ACK protocol and the internal memory in LIFO mode. Thereby temporary data from the PAEs written on the stack and loaded from the stack if necessary.
- the compiler technologies required for this are well known. Due to the variable stack depth, which is achieved by data exchange between the internal memory and an external memory, the stack can be of any size.
- Each PAE can represent a computing unit based on the accumulator principle. As known from PACT02, it is possible to feed back the output register to the input of the PAE. This creates an accumulator according to the prior art. In connection with the sequencer according to FIG. 11, simple accumulator processors can be constructed.
- a simple register processor can be built using the REQ / ACK protocol and the internal memory in standard memory mode.
- the register addresses are generated by a group of PAEs, while another group of PAEs handles the processing of the data.
- the memory has two interfaces. A first one that connects the memory to the array and a second one that connects the memory to an IO unit.
- the memory should be designed as a dual-ported RAM, so that write and read accesses can take place independently of one another.
- the first interface is the usual PAE interface (PAEl), which guarantees access to the bus system of the array, as well as synchronization and trigger processing. Triggers can be used to display different states of memory or to force actions in memory, for example
- Cache hit / miss The cache mode shows whether an address was found in the cache
- a configurable state machine that controls the various operating modes is assigned to the PAE interface.
- a counter is assigned to the state machine in order to generate the addresses in FIFO and LIFO mode.
- the addresses are routed to the memory via a multiplexer, so that additional addresses that are generated in the array can be routed to the memory.
- the second interface is used to connect an IO unit (IOI).
- IOI IO unit
- the IO unit is designed as a configurable controller with an external interface.
- the controller reads or writes word or block data into or out of memory. The data is exchanged with the IO unit.
- the controller also supports various cache functions using an additional TAG memory.
- IOI and PAEl are synchronized with each other so that there is no collision between the two interfaces.
- the synchronization depends on the operating mode, while For example, in standard memory or stack mode only either the IOI or the PAEl can access the entire memory, in FIFO mode the synchronization is line by line, i.e. while IOI is accessing a line x, the PAEl can access any other line unequal x access at the same time.
- the IO unit is designed according to the peripheral requirements, for example:
- Serial controller e.g. NGIO
- a VPU can have any storage elements with any 10 units. Different IO units can be implemented on one VPU.
- the addressable memory size is limited by the memory size.
- a base address is specified in the external memory in the IOI controller.
- the controller reads block-by-block data from the external memory address and writes it to memory, with the internal and external addresses respectively be incremented (or decremented); until all of the internal memory has been transferred or until a preset limit has been reached.
- the array works with the local data until the controller writes it back to external memory. Writing is analogous to the reading process described. Reading and writing by the controller can be triggered a) by triggers or b) by the array accessing an address that is not stored locally. If the array accesses such an address, the internal memory is first written to the external one and then the memory block is reloaded by the desired address.
- a trigger can be used to push / pop the register set with the external memory for a task change or a context switch.
- the lookup table function is a simplification of 1.2.
- the data is read from the external RAM into the internal RAM either once or several times by a CT call or a trigger.
- the array reads data from internal memory, but does not write data to internal memory.
- the base address in the external memory is stored in the controller either by the CT or the array and can be changed at runtime. Loading from the external memory is triggered either by the CT or by a trigger from the array and can also be done at runtime.
- the array optionally accesses the memory.
- the memory works like a cache memory for the external memory according to the prior art.
- a trigger from the array or the CT can cause the cache to be emptied (ie the cache has been written completely to the external memory).
- FIFO mode is usually used when data streams are routed to the VPU from outside. Then the FIFO serves as a decoupling between the external data processing and the VPU internal data processing, such that either the external is written to the FIFO and read by the VPU or vice versa.
- the states of the FIFO are signaled by triggers to the array and possibly also externally.
- the FIFO itself is implemented according to the prior art with different write and read pointers.
- An internal stack is built up using an address register. With each write access to the memory by the array, the register is incremented (b) depending on the mode (a). The register is reversed for read access from the array
- the internal memory If the internal memory is too small to build a stack, it can be swapped out to the external memory.
- the external address counter (ERC) is modified line by line.
- the remaining stack content must be moved to the beginning of the stack, the internal stack address is adjusted accordingly.
- a more efficient variant is to design the stack as a ring buffer (see PACT04).
- An internal address counter is modified by adding or removing stack entries. As soon as the internal address counter (IAC) at the top of the memory exceeds, it points to the lowest address. If the IAC falls below the lowest address, it points to the top one.
- An additional counter (FC) shows the level of the memory, i.e. the counter is incremented with each word written, decremented with each read. The FC shows when the memory is empty or full. This technology is known from FIFOs. If a block is thus written into the external memory, the adaptation of the FC is sufficient to update the stack.
- An external address counter (EAC) always points to the oldest entry in the internal memory and is therefore located at the end of the stack opposite the IAC. The EAC is modified if
- the ERC is modified according to the external stack operation (set up or take down).
- An MMU that fulfills two functions can be assigned to the external memory interface:
- the programming principle of the VPU technology according to the invention consists in separating sequential codes and breaking them down into as many small and independent sub-algorithms as possible, while the sub-algorithms of the data flow code are mapped directly onto the VPU.
- VPU Vpu C
- VC Vpu C
- the compiler extracts the VC in the preprocessor and forwards it directly to the VC back-end processing (VCBP).
- Each individual MC is placed in a virtual array and routed. Then the space requirements and the expected performance are analyzed. To do this, the VCBP is called and the individual MCs are partitioned together with the VC, which are always mapped.
- the MCs whose VPU implementation achieve the highest performance growth are taken over, the rest are passed on as C ++ to the next compiler level.
- This compiler level can be implemented differently depending on the architecture of the VPU system:
- the remaining C ++ code is analyzed for each independent module.
- the most suitable sequencer variant is selected from a database and stored as a VC code (SVC). This step is mostly iterative, ie a sequencer variant is selected, the code is compiled, analyzed and compared with the compiled code of other sequencer variants.
- the object code (SVCO) of the C ++ code is generated for the selected SVC.
- SVC VC code
- SVCO object code
- Both 2.1 and 2.2 are used The mode of operation corresponds to that of 2.2.
- VPU with sequencer and external processor This function also corresponds to 2.2. There are special static sequencer models in the database for the external processor.
- the linker connects the individual modules (VC, MC, SVC and SVCO) into an executable program. To do this, he uses the VCBP to place the individual modules, route them and determine the temporal partitioning. The linker also adds the communication structures between the individual modules and, if necessary, inserts registers and memories. Based on an analysis of the control structures and dependencies of the individual modules, structures for storing the internal states of the array and the sequencers are added in the event of a reconfiguration.
- the machine models used can be combined as required within a VPU. Depending on which model is optimal, you can also switch between the models within an algorithm. If additional memory is added to a register processor, from which the operands are read and into which the results are written, a load / store processor can be set up. Several different memories can be allocated by treating the individual operands and the result separately.
- These memories then work as a kind of load / store unit and represent a kind of cache for the external memory.
- the addresses are calculated by PAEs separated from the data processing.
- Pointer is calculated just before using the data structures it points to, often the pipeline cannot be filled quickly enough and processing becomes inefficient especially in VPUs.
- the solution is to use the compiler to rearrange the pointer structures so that the pointer addresses are calculated as long as possible before they are used. At the same time, there should be as few direct dependencies between a pointer and the data it points to.
- P196 54 of the prior art is defined in terms of the configuration properties of cells (PAEs). Two properties are to be considered:
- a PAE (0903) is assigned a set of configuration registers (0904) that contains a configuration (FIG. 9a).
- a group of PAEs (0902) can access a memory for storing or reading data in accordance with P196 54 846.2 (FIG. 9b)
- the task is to a) create a process that speeds up the reconfiguration of PAEs and decouples them temporally from the superordinate loading unit, and b) to design the process in such a way that the possibility is created simultaneously of several configurations to sequences, and c) several simultaneously Keep configurations in a PAE, one of which is always activated and can be quickly switched between different configurations.
- the configuration register is decoupled from the higher-level loading unit (CT) (FIG. 10) by using a set of several configuration registers (1001). Exactly one of the configuration registers selectively determines the function of the PAE. The selection of the active register is carried out via a multiplexer (1002).
- the CT can write to any of the configuration registers as long as this does not determine the current configuration of the PAE, ie it is active. The writing to the active register is in principle possible, the methods described in PACT10 are available.
- An arbitrary status signal or a group of arbitrary status signals which are routed to 1002 via a bus system (0802) (FIG. 10a).
- the status signals are generated by any PAEs or made available by external connections of the block (see Fig. 8).
- the status signal of the PAE which is configured by 1001/1002, is used for selection (Fig. 10b).
- a signal generated by the higher-level CT is used for selection (FIG. 10c).
- the CT is decoupled in time by using several registers. This means that the CT can "preload" several configurations without being directly dependent on time.
- the method described in FIG. 10 can easily be expanded to a sequencer (FIG. 11).
- a sequencer is used Instruction decoder (1101) used to control the selection signals of the multiplexer (1002).
- the sequencer determines the next configuration to be selected depending on the currently selected configuration (1102) and additional status information (1103/1104).
- the status information can be
- 1001 can also be designed as a memory, instead of
- a command from 1101 is addressed.
- the addressing depends on the command itself and on a status register. In this respect, the construction of a "von Neumann" machine corresponds, with the difference
- FIG. 12 Another additional or alternative method (FIG. 12) for building sequencers within VPUs is the use of the internal data memories (1201, 0901) for storing the configuration information for a PAE or a group of PAEs.
- the data output of a memory switched to a configuration input or data input of a PAE or several PAEs (1202).
- the address (1203) for 1201 can be generated by the same PAE / PAEs or one or more other ones.
- the sequencer is not permanently implemented, but is simulated by a PAE or a group of PAEs.
- the internal memories can reload programs from the external memories (cf. memory system according to the invention).
- the PAE is provided with an additional register set, the individual registers of which are either determined by the configuration, led to the ALU or written to by the ALU; or can be used freely by the command set of an implemented sequencer (register mode).
- One of the registers can also be used as an accumulator (accumulator mode). If the PAE is used as a full-fledged machine, it makes sense to use one of the registers as an address counter for external data addresses.
- the RDY / ACK REQ / ACK synchronization model already described is used to manage stacks and accumulators outside the PAE (e.g. in the memories according to the invention).
- the modules of type A are grouped together and end up with a conditional jump, either to B1 or B2.
- a reconfiguration point is inserted at this position (0401), since it makes sense to consider the branches of the conditional jump as one group each (case 1). If, on the other hand, both branches of B (B1 and B2) would also fit together with A on the target module (case 2), it would make sense to insert only one reconfiguration point at 0402, since this reduces the number of configurations and increases the processing speed. Both branches (Bl and B2) jump to C at 0402.
- the configuration of the cells on the target module is shown schematically in Fig. 4b.
- the functions of the individual graph nodes are mapped to the cells of the target module.
- One line each represents a configuration.
- the dashed arrows when changing lines indicate a reconfiguration.
- S n is a data-storing cell of any configuration (register, memory, etc.).
- S n I is a memory that accepts data and S n O outputs a memory of the data.
- the memory S n is the same for the same n, I and O denote the data transfer direction.
- the model in FIG. 4 corresponds to a data flow model, but with the essential expansion of the reconfiguration point and the partitioning of the graph that can be achieved with it, whereby the data transferred between the partitions are cached.
- a graph B n from a set of graphs B is selectively called from any graph set and constellation (0501). After executing B, the data return to 0501.
- the graph B selectably provides a special arithmetic unit and / or special opcodes for certain functions and is used alternatively to accelerate C.
- B1 can be an optimized algorithm for calculating matrix multiplications
- B2 represents an FIR filter
- B3 represents a pattern recognition.
- the appropriate or corresponding graph B is called in accordance with an opcode which is decoded by 0501.
- 5b schematically illustrates the mapping to the individual cells, the pipeline-like calculator character being symbolized in 0502.
- loops are shown in FIG. 6a. Basically, loops can be handled in three ways:
- Loops are set up across several cells within the data flow (0602a / b). The end of the loop is fed back to the beginning of the loop.
- Sequencer approach A sequencer with a minimal instruction set executes the loop (0603a / b).
- the cells of the target building blocks are designed in such a way that they contain the corresponding sequencer (cf. FIG. 11a / b).
- a suitable disassembly of loops can optimize their execution if necessary:
- the loop body i.e. the part to be repeated
- the loop body can often be optimized by removing certain operations from the loop and placing them in front of or behind the loop (0604a / b). This significantly reduces the number of commands to be sequenced. The removed operations are performed only once before or after the loop is executed.
- Another optimization option is the division of loops into several smaller or shorter loops. The division takes place in such a way that several parallel or several sequential (0605a / b) loops are created.
- 7 illustrates the implementation of a recursion.
- the same resources (0701) in the form of cells are used for each recursion level (1-3).
- the results of each recursion level (1-3) are written to a memory (0702) built up according to the stack principle during construction (0711 :).
- the stack is dismantled simultaneously with the dismantling (0712 :) of the levels.
- FIG. 14 shows the virtual machine model.
- Data (1401) and states (1402) belonging to the data are read from an external memory into a VPU (1403).
- 1401/1402 are selected via an address 1404 generated by the VPU.
- PAEs are grouped into different groups (1405, 1406, 1407).
- Each group has a data processing part (1408) which has local implicit states (1409) which have no influence on the surrounding groups. Therefore, its states are not forwarded outside of the group. However, it can depend on the external conditions.
- Another part (1410) generates states that influence the surrounding groups.
- the data and states of the results are stored in a further memory (1411, 1412).
- the address of operands (14004) can be saved (1413) as a pointer.
- 1404 can be managed via register (1414) for time synchronization.
- FIG. 14 A simple model is shown in FIG. 14 for clarification. Networking and grouping can be much more complex than in this model. States and data can also be transferred to modules other than the ones below. It is possible that data is transferred to modules other than the states. Both data and states of a certain module can be of several different modules can be received. 1408, 1409 and 1410 can be present within a group. Depending on the algorithm, individual parts may also be missing (e.g. 1410 and 1409 available, but 1410 not).
- FIG. 15 shows how partial applications are extracted from a processing graph.
- the graph is broken down in such a way that long graphs are sensibly divided and displayed in sub-applications (H, A, C, K). After jumps, new subgraphs are formed (C, K), with a separate subgraph being created for each jump.
- each subgraph can be loaded separately from the CT (see PACTIO). It is essential that subgraphs can be managed using the mechanisms in PACTIO. This includes in particular the intelligent configuration, execution / start and deletion of the sub-applications.
- subapplication 1503 causes subapplication A to be loaded or configured while subapplication K is being executed. This means that a) sub-application A is already completely configured in the PAEs at the end of execution of sub-application K, provided the PAEs have several configuration registers; b) Sub-application A at the end of execution of sub-application K has already been loaded into the CT if the PAEs have only one configuration register.
- Another special feature is shown for partial applications A.
- a FETCH command can be triggered by a trigger using its own ID. This means that partial applications can be preloaded depending on the state of the array.
- the ULIW model differs essentially from the VLIW model in that
- the routing of the data includes
- the described method of partitioning compilers can also be used for today's standard processors based on the RISC / CISC principle. If a PACTIO unit (CT) is then used to control the command cache, this can be considerably optimized and accelerated.
- CT PACTIO unit
- Figure 16 shows the structure of a stack processor. Protocols are generated by the PAE array (1601) in order to write or read to a memory (1602) configured as LIFO. An RDY / ACK protocol is used for writing and REQ / ACK protocol for reading. Networking and operating modes are configured by the CT (1603). 1602 can transfer its content to the external memory (1604).
- a number of the PAEs are supposed to work as a register processor (FIG. 17).
- Each PAE consists of an arithmetic unit (1701) and an accumulator (1702) to which the result of 1701 is fed back (1703).
- Each PAE thus represents an accumulator processor in this example.
- a PAE (1705) reads and writes the data into the RAM (1704) configured as standard memory.
- Another PAE (1706) generates the register addresses.
- the registers are often implicit and can then be configured as constants and sent by the data processing PAEs.
- the use of accumulator processors for a register processor is exemplary. PAEs without an accumulator can also be used to set up register processors.
- the architecture shown in FIG. 17 can be used to control registers as well as to control a load / store unit.
- FIG. 18 shows a complex machine as an example in which the PAE array (1801) on the one hand controls a load / store unit (1802) with downstream RAM (1803) and at the same time a register bank (1804) with downstream RAM (1805 ) having.
- 1802 and 1804 can each be controlled by a PAE or any group of PAEs.
- the unit is controlled by a CT (1806) according to the VPU principle.
- FIGS. 19, 20, 21 show an internal memory according to the invention, which at the same time represents a communication unit with external memories and / or peripherals.
- the individual figures show different operating modes of the same memory. The Operating modes and individual detailed settings are configured.
- Figure 19a shows a memory according to the invention in "register / cache” mode. Data words from a usually larger and slower external memory (1902) are stored in the memory (1901) according to the invention.
- the data read or sent by the PAEs from the main memory 1902 is buffered in 1901 by means of a cache method. Any known cache method can be used.
- the assignment of the addresses between 1901 and 1902 can be arbitrary and only depends on the respective algorithms of the two operating modes.
- 19b shows the corresponding machine as a block diagram.
- a control unit (1904) is assigned to the bus between 1901 and 1902 and, depending on the operating mode, acts as a load / store unit (according to the prior art) or as a cache controller (according to the prior art).
- a memory management unit (MMU) (1905) with address translation and verification can be assigned to this unit become.
- Both the 1904 and 1905 can be controlled by the PAEs.
- the MMU is programmed, the load / store addresses set or a cache flush triggered.
- FIG. 20 shows the use of the memory (2001) in the FIFO mode, in which data streams are decoupled according to the known FIFO principle.
- the typical use is in a write (2001a) or read interface (2001b).
- Data is decoupled in time between the PAEs that are connected to the internal bus system (2002) and the peripheral bus (2003).
- a unit (2004) which controls the write and read pointer of the FIFO depending on the bus operations from 2003 and 2002.
- FIG. 21 shows the working principle of the memory according to the invention in stack mode.
- a stack is (according to the prior art) a stack memory, the top / bottom element of which is the currently active. Data is always added above / below, and the data above / below is also removed. That the last written date is also the one that is read first (Last In First Out). Whether a stack grows up or down is insignificant and depends on the implementation. The following exemplary embodiment considers stacks that grow upwards.
- the most current data is kept in the internal memory 2101, the most recent entry (2107) is located at the top in 2101. Old entries are stored in the external memory 2102. If the stack continues to grow, the space% m internal memory 2101 is no longer sufficient.
- a part of 2101 is written as a block to the more current end (2103) of the stack in 2102. This part is the oldest and therefore the least current data (2104).
- the remaining data in 2101 are then shifted in such a way that the data copied to 2102 in 2101 are overwritten with the remaining data (2105) and thus sufficient free memory (2106) is created for new stack entries.
- the data in 2101 is shifted from a certain (freely selectable) point in such a way that free memory is created behind the oldest and most inaccurate data.
- a memory block from 2102 is copied into the freed-up memory, which is then deleted in 2102.
- 2101 and 2102 represent a single stack, with the current entries being in 2101 and the older and less current entries being in 2102.
- the method effectively represents a cache for stacks. Since the data blocks are preferably transmitted by block operations, the data transfer between 2101 and 2102 can be carried out in the fast burst operating modes of modern memories (SDRAM, RAMBUS, etc.).
- the stack grows upwards. If the stack grows downwards (a frequently used method), the positions up / down and the directions in which the data are moved within a memory are exchanged exactly.
- the internal stack 2101 is expediently designed as a type of ring memory.
- the data at one end of the ring is transferred between PAEs and 2101 and at the other end of the ring between 2101 and 2102. This creates the Advantage that data can easily be moved between 2101 and 2102 without affecting the internal addresses in 2101. Only the position pointers of the lower and upper data and the level counter have to be adjusted.
- the data transmission between 2101 and 2102 can be triggered by the known ring memory flags "almost full (almost full) / full (full)" and "almost empty (almost empty) / empty (empty)".
- a unit (2110) for managing the pointers and counters is assigned to the internal stack 2101.
- a unit (2111) for controlling the data transfers is looped into the bus (2114) between 2101 and 2102.
- a MMU (2112) according to the state of the art with the corresponding test systems and address translations can be assigned to this unit.
- connection between the PAEs and 2101 is realized via the 2113 bus system.
- FIG. 1 An example of the reordering of graphs is shown in FIG.
- the left column (22 .. a) shows an unoptimized arrangement of commands.
- Pointers A (2207a) and B (2211a) are loaded.
- the values of the pointers are required (2208a, 2212a).
- This dependency is too short to be carried out efficiently, since a certain time (2220a, 2221a) is required for loading from the memory.
- By rearranging the commands (22..b) the time periods are increased to a maximum (2220b, 2221b).
- the value of the pointer of A is required in 2210 and in 2208, 2208 is sorted into 2210 because this saves more time for calculating B.
- Calculations that are independent of the pointers are possible (2203.2204.2206) For example, insert between 2211 and 2212 to get more time for memory accesses.
- a compiler or assembler can use system parameters that represent the access times to carry out the corresponding optimization.
- Figure 23 shows a special case of Figures 4-7.
- An algorithm often consists of data flow parts and sequential parts, even within loops. Structures of this type can be constructed efficiently in accordance with the described method using the bus system described in PACT07.
- the RDY / ACK protocol of the bus system is first expanded by the REQ / ACK protocol according to the invention.
- register contents of individual PAEs can be queried by one or more other PAEs or by the CT.
- a loop (2305) is now broken down into at least two graphs, a first (2301) representing the data flow component and a second (2302) representing the sequential component.
- a conditional jump chooses between the two graphs.
- the special thing is that 2302 needs to know the internal status of 2301 for execution and conversely 2301 needs to know the status of 2302.
- the sequencer reads out the states of the respective registers from the PACT07 using the bus system (2303). The sequencer executes its operations and writes all changed states back to the registers (again via the bus system according to PACT07) (2304). Finally, it should be noted that the graphs discussed are not necessarily tight loops (2305) must act.
- the method can generally be used on any sub-algorithm that is executed several times within a program run (reentrant) and is optionally processed either sequentially or in parallel (data flow-like), the states between the sequential and the parallel part having to be transferred.
- the wave configuration offers considerable advantages in terms of the speed of the reconfiguration, particularly in the case of simple sequential operations.
- sequencer can also be designed as an external microprocessor.
- a processor is connected to the array via the data channels and exchanges local, temporary data with the array via bus systems. All sequential parts of an algorithm that cannot be mapped into the array of PAEs are processed on the processor.
- Register bus which enables access to the registers of the VPU and thus guarantees data exchange (2302, 2304) between 2302 and 2301.
- Figure 24a shows the influence of wave reconfiguration on a simple sequential algorithm.
- a series of PAEs from the matrix of all PAEs of a VPU is shown.
- the states are indicated in the clocks after clock t with one clock delay each.
- 24b shows the temporal effect of the reconfiguration of large parts. For example, a set of PAUs from a VPU is shown. The states in the clocks after clock t are indicated with a different delay of several clocks in each case.
- Figure 25 illustrates the scalability of the VPU technology.
- the scalability essentially results from the rolling out of a graph without a chronological sequence separates individual sub-applications.
- the algorithm from FIG. 4 is selected as an example.
- the individual subgraphs are transmitted to the VPU one after the other, with either Bi or B 2 being loaded.
- FIG. 25b all subgraphs are transferred to a set of VPUs and connected to one another with bus systems. This means that large amounts of data can be processed efficiently without the negative impact of reconfiguration.
- FIG. 26 shows a circuit for accelerating the (re) configuration time of PAEs.
- the circuit can be used to process sequential algorithms.
- the array of PAEs (2605) is partitioned into several parts (2603). Each part is assigned an independent unit for (re) configuration (2602).
- a CT (2601) according to the prior art (cf. PACTIO), which in turn is connected to a further CT or to a memory (2604), is superior to these units.
- the CT loads the algorithms into the configuration units (2602).
- the 2602 automatically load the configuration data into the PAEs assigned to them.
- FIG. 1 A structure of a configuration unit is shown in FIG.
- the core of the unit is a sequencer (2701) which ' masters a series of commands.
- the main commands are: wait ⁇ trg #>
- the source and destination can each be in a memory or a peripheral address.
- the —commands — copy — an assigned — Bl & G-k — on — PAE address and PAE data from memory to the PAE array. ⁇ count> indicates how large the data block to be copied is.
- the data block is either attached directly to the opcode (a) or referenced by specifying the first memory address ⁇ memref> (b).
- Each pa_adr n -pa_dta n line represents a configuration for a PAE.
- pa_adr n specifies the address and pa_dta n the configuration word of the PAE.
- the RDY / ACK-REJ protocol is known from PACTIO. If the configuration data is accepted by a PAE, the PAE acknowledges the sent data with an ACK. If, on the other hand, a PAE cannot accept the configuration data because it is not in a configurable state, it sends a REJ back. This causes the configuration of the sub-algorithm to fail.
- the position rejected with REJ pa_adr n -pa_dta n line is saved.
- the commands will be called again later (see PACTIO, FILMO). If the command has been processed completely, ie no REJ has occurred, the command does not carry out any further configuration but terminates immediately. If a REJ occurred, the command jumps directly to the position of the rejected pa_adr n -pa_dta n _ line.
- the position is saved differently depending on the command: pabmr: The address is saved in the register named ⁇ regno>. pabmm: The address is saved directly in the command at the ⁇ offset> location.
- the commands can be implemented using DMA structures as memory / IO transfers according to the prior art.
- the DMAs are expanded by logic for monitoring the incoming ACK / REJ.
- the start address is determined by ⁇ regno> or ⁇ offset>.
- the last address of the data block is calculated by the address of the command plus its opcode length minus one plus the number of pa_adr n -pa_dta n lines. It makes sense to extend the circuit described in PACTIO with the commands mentioned.
- FIG. 27 shows the structure of a unit 2602.
- the unit consists of a register set 2701 to which a simple ALU for stack operations is assigned (2702).
- the structure contains address register and stack pointer.
- a fully-fledged ALU can be used as an option.
- a minimal width bus system (2703) connects register and ALU. The width is dimensioned so that simple control flow commands or simple ALU operations can be displayed in a meaningful way.
- the previously described PABM commands and the commands according to PACTIO are supported.
- Register and ALU are controlled by a sequencer 2706, which is a complete microcontroller by executing instructions.
- a unit 2704 is connected to 2703, which accepts and acknowledges triggers from the assigned PAEs and, if necessary, in turn sends triggers to the PAEs. Incoming triggers trigger an interrupt in the sequencer 2706 or are queried by the WAIT command.
- An interface (2705) to a data bus of the assigned PAEs is optionally connected to 2703 in order to be able to send data to the PAEs. For example, the assembly codes of a sequencer implemented in the PAEs are sent via 2705. If necessary, the interface contains a converter for adapting the different bus widths.
- the units 2701 to 2706 are connected via a multiplexer / demultiplexer (2707) to a bus system (2708) which is many times wider and leads to the memory (2709).
- the bus system 2708 leads to an interface (2709) which is controlled by the PA commands and leads to the configuration bus of the PAEs. 2708 is deliberately designed to be able to send as many configuration bits per clock unit as possible to the PAEs via 2709.
- Another interface (2710) connects the bus to a higher-level CT, which exchanges configuration and control data with 2602.
- the interfaces 2710 and 2709 have been used several times in PACTIO, PACT ?? have been described.
- 2706 can handle a reduced and task-optimized minimal instruction set, which is optimized above all for the PA commands, jumps, interrupts and lookup commands. Furthermore, the optimized wide bus system 2708, which is transmitted via 2707 to a narrow bus system, is of particular importance for the reconfiguration speed of the unit.
- FIG. 27a is a special embodiment of FIG. 27.
- the interface 2705 is used to transmit assembly code to sequencers configured in the PAE array.
- the processing power of the sequencers depends largely on the speed of the 2705 interface and its memory access.
- 2705 is replaced by a DMA function with direct memory access (2720 n ).
- 2720 n carries out its own memory accesses and has its own bus system (2722 n ) with corresponding adaptation of the bus width (2721 n ); the bus for loading wide command sequences (ULIW) can be relatively wide, so that the limit case 2721 n is completely eliminated.
- the memory 2711 has been physically separated into 2711a and 2711b n .
- 2711a and 2711b n The address space above 2711a and 2711b n remains linear, but can be independent of both memory blocks from 2701, 2702, 2706 be accessed at the same time; 2720 n can only access 2711b n .
- 2720 n, 2721 n and n can 2711b several times (n) be implemented to enable multiple sequencer can be managed simultaneously.
- 2711b n can again be divided into several physically independent memory areas.
- FIG. 38 describes implementation examples for 2720 n .
- the structure of complex programs is illustrated in FIG.
- the basic modules of the programs are the complex configurations (2801) which contain the configurations of one or more PAEs and the associated bus and trigger configurations.
- the 2801 are represented by an opcode (2802), which can have additional parameters (2803). These parameters can contain constant data values, variable start values or special configurations. Depending on the function, there are one, several or no parameters.
- Several opcodes use a common set of complex configurations and thus form an opcode group (2805).
- the different opcodes of a group differ in the special configurations of the complex configurations. Differentiations (2807) are used for this, which either contain additional configuration words or overwrite configuration words occurring in 2801.
- a program (2804) is composed of a sequence of opcodes with the respective parameters.
- a complex function can be loaded into the array once and can then be reconfigured using different parameters or differentiations. This will only reconfigured the changing parts of the configuration.
- Different opcode groups use different complex configurations. (2805a, ..., 2805n).
- the different levels are processed in different levels by CTs (cf. CT hierarchies in PACTIO). The different levels are shown in 2810, where 1 is the lowest level and N is the highest level. CTs can be built up to any hierarchy (see PACTIO).
- Configuration words that map an algorithm to the array of PAEs.
- the algorithm can also be designed as a sequencer. Configuration takes place via interface 2709. Configuration words are defined by the hardware.
- Algorithm-specific codes that depend on the possible design of a sequencer or algorithm. These codes are defined by the programmer or compiler and are used to control an algorithm. If, for example, a Z80 is configured as a sequencer in the PAEs, these codes represent the opcode of the Z80 microprocessor. Algorithm-specific codes are sent to the array of PAEs via 2705.
- FIG. 2901 and 2902 represent the input and output registers of the data.
- the registers are assigned the complete networking logic for connection to the data bus (s) (2920, 2921) of the array (see PACT02).
- the trigger lines acc. PACT08 are tapped by 2903 from the trigger bus (2922) and connected to the trigger bus (2923) with 2904.
- ALU any configuration switched.
- a register set (2915) is assigned to the data buses (2906, 2907) and the ALU, in which local data are stored.
- the RDY / ACK synchronization signals of the data buses and trigger buses are led to a state machine (or a sequencer) (2910) (2908) or generated by the unit (2909).
- the CT selectively accesses a plurality of configuration registers (2913) via an interface unit (2911) by means of a bus system (2912).
- 2910 selects a specific configuration in each case via a multiplexer (2914), or sequences over a plurality of configuration words which then represent commands for the sequencer.
- VPU technology mainly works pipelined, it is advantageous to provide either group 2901 and 2903 or group 2902 and 2904 or both groups with additional FIFOs. This can prevent a pipeline from stalling due to simple delays (e.g. in synchronization).
- 2920 is an optional bus access via which one of the memories of a CT (see FIGS. 27, 2720) or an ordinary internal memory can be connected to the sequencer 2910 instead of the configuration register. This means that large sequential programs can be executed in a PAE.
- the multiplexer 2914 is switched so that it only connects the internal memory.
- the addresses are a) generated for the CT memory by the circuit in FIG. 38. b) generated directly from 2910 for the internal memory.
- FIG. 30 shows a possible extension of the PAE to include access by the CT or another microprocessor to enable the data register.
- the address space and the interface of the bus unit (formerly 2911, 3003) are expanded by the additional data buses (3001).
- a multiplexer (3002) is connected upstream of the respective registers, which 3003 can write data into the register via bus 3001.
- the outputs of the registers are fed back to 3003 via 3001.
- 3003 transmits the data to the CT 2912.
- an independent bus 3005
- an additional interface (3004) for the transmission of the data to the CT, it is possible to transmit the data to an independent bus (3005) via an additional interface (3004).
- FIG. 31 shows the coupling of the array of PAEs (3101) to a higher-level microcontroller.
- 3101 includes all IO channels according to the memories according to the invention.
- the architecture operates according to FIG. 23. 2912 in FIG. 31a provides the bus for the configuration data and register data according to. Figure 30 available.
- the data bus is represented separately by 3104.
- 3102 represents the CT, which also represents the microprocessor in Fig. 31a.
- connection models to a processor exist independently of one another, which are selected depending on the programming model and considering price and performance:
- the respective bus is addressed via a register that is integrated directly into the register set of the processor and is addressed by the assembler as a register or group of registers.
- This model is most efficient when a few registers are sufficient for data exchange.
- IO model The respective bus is in the IO area of the processor. This is usually the simplest and cheapest option.
- the processor and the respective bus share a memory area in the data memory. This is a high-performance solution for large amounts of data.
- the processor and bus share the same memory as in the previous model.
- DMA fast DMA
- the respective memories should be physically separable from the rest of the memory (several memory banks) so that the processor and VPU can access their memories independently.
- a CT (3102) takes over the configuration of the array, while a dedicated processor (3103) ensures the programming model according to FIG. 23 via 3006 by exchanging register data with the array via 3006 and exchanging the usual data via 3104.
- FIGS. 31c / d correspond to FIGS. 31a / b, but a shared memory (3105) between the respective processor and 3101 was selected for the data exchange.
- FIG. 32 shows a circuit which enables the memory elements according to the invention to jointly access a memory or a group of memories, each individual memory of the group being individually and uniquely addressable.
- the individual memory elements (3201) are connected to a bus system in which each 3201 has its own bus has.
- the bus can be bidirectional or can be realized by two unidirectional buses.
- There is one address / data multiplexer per memory which connects a bus to the memory.
- the pending addresses of each bus are decoded (3207) and then one bus per time unit is selected (3204) by an arbiter (3208).
- the corresponding data and addresses are transferred to the respective memory bus (3205a), a state machine (3206) generating the necessary protocols.
- the address of the memory is switched to the bus by the respective state machine, which requested the data.
- the addresses of all incoming buses are evaluated per bus of the bus system 3202 by a multiplexer unit and transferred to the corresponding bus.
- the evaluation is carried out in accordance with the evaluation of the output data, ie a decoder (3209) per input bus (3205b) passes a signal to an arbiter (3210), which controls the data multiplexer. Different input buses are thus routed to bus system 3202 per time unit.
- the rigid state machine / the rigid sequencer 2910 is replaced by a freely programmable (3301) for more flexible and simple evaluation of the trigger and RDY / ACK signals.
- the full function of 3301 is determined by configuration registers 2913 prior to the execution of algorithms by CT.
- the loading of 3301 is controlled by a CT interface (3302) which is expanded to 2911 by the administration of 3301.
- the advantage of 3301 is that the different trigger and RDY / ACK signals can be handled much more flexibly than in the permanently implemented 2910.
- the disadvantage is the size of 3301. A compromise that leads to the highest flexibility with a reasonable size is to evaluate the trigger and RDY / ACK signals by a unit according to 3301 and to control all fixed processes within the PAE by a permanently implemented unit according to 2910.
- the PAE according to the invention for processing logical functions is shown in FIG. 34.
- the core of the unit is a unit for linking individual signals (3401), which is described in more detail below.
- the bus signals are connected to 3401 via the usual registers 2901, 2902, 2903, 2904.
- the registers are expanded by a feed mode that selectively exchanges individual signals between the buses and 3401 without storing them in isochronous mode (register).
- Configuration registers (3403) are adapted to the different configurations of 3401.
- the CT interface (3404) is also designed accordingly.
- FIG. 35 shows possible configurations of 3401.
- a global data bus connects the logic cells 3501 and 3502 to the registers 2901, 2902, 2903, 2904.
- 3504 is connected to the logic cells by bus switches, which can be designed as multiplexers, gates, transmission gates or simple transistors ,
- the logic cells can either be completely standardized or have different functionality (3501, 3502).
- 3503 represents a RAM memory. Possible configuration of the logic cells are:
- the selection of functions and networking can either be flexibly programmable using SRAM cells or using an unchangeable ROM or semi-static FlashROM memory.
- the parallel variant for VPUs is shown in FIG. 36.
- the operands (3601) are routed simultaneously to several possible paths of sub-algorithms (3602a, 3602b, 3602c).
- the subagorit men can have different space and time requirements.
- the data are stored according to the invention (3612a, 3612b, 3612c) before they are processed by the next sub-algorithms after reconfiguration (3603).
- the reconfiguration times of the individual sub-algorithms are also independent of one another, as is the number of sub-algorithms themselves (3603, 3614).
- Trigger signals generated by a condition (cf. PACT08) (3606) determine which of the paths is selected and forwarded to the subsequent algorithms.
- FIG. 37 shows the structure of a high-level language compiler that translates ordinary sequential high-level languages (C, Pascal, Java) onto a VPU system. Sequential code (3711) is separated from parallel code (3708), which makes 3708 directly in the
- the code (3701) is first separated in a preprocessor (3702) into data flow code (3716) (which was written in a special version of the respective programming language in a data flow-optimized manner) and ordinary sequential code (3717).
- 3717 is examined for parallelizable sub-algorithms (3703), the sequential sub-algorithms are discarded (3718).
- the parallelizable sub-algorithms are provisionally placed and routed as macros.
- the macros with the data flow-optimized code (3713) are placed together, routed and partitioned (3705).
- Statistics (3706) evaluate the individual macros, as well as their partitioning with regard to efficiency, the reconfiguration time and the effort of reconfiguration being incorporated into the efficiency analysis. Inefficient macros are removed and discarded as sequential code (3714).
- the remaining parallel code (3715) is compiled together with 3716 and assembled (3707) and VPU object code output (3708).
- a linker (3722) combines the assembler codes (3708, 3711, 3721) and generates the executable object code (3723).
- FIG. 38 shows the internal structure of 2720.
- the core of the circuit is a loadable up / down counter (3801), which receives its starting value from the circuit in FIG. 27 from the bus 3803 (corresponds to 2703) via the correspondingly set multiplexer 3802.
- the counter serves as a program counter (PC) for the assigned sequencer, the start value is the first address of the program to be executed.
- the value of 3801 is fed back to the counter via an adder (3805) and 3802.
- the sequencer carries an offset to 3805 via bus 3804, which is either subtracted from the PC or added. Relative jumps can thus be implemented efficiently.
- the PC is brought out to the PAE array via bus 3811 and can be saved on the stack for call operations. For ret operations, the PC is led from the stack to 3801 via 3804 and 3802.
- Figure 38a is a variant of Figure 38 in which the stack pointer (3820) is also integrated. Via 3804, only the offset for relative jumps is made to 3805 (3804a).
- the stack pointer is an up / down counter corresponding to 3801, whose start value represents the start of the stack and is loaded via 3803.
- the PC is led directly to the data bus to the memory in order to be written to the stack via a multiplexer during call operations.
- the data bus of the memory is fed back to 3801 via 3821 and 3802, in order to carry out ret operations.
- Figure 39 illustrates the operation of the memory.
- the memory (3901) is addressed via a multiplexer (3902).
- the addresses from the array (3903) are routed directly to 3901.
- the addresses are generated in an up / down counter (3904).
- the addresses of the IO side are made available by another up / down counter (3905).
- the addresses for the external RAM (or 10) are generated by another up / down counter (3906), the base address is loaded by a register (3907).
- the register is set by the CT or an external host processor.
- the entire control is carried out by a state machine (3908).
- 3908 takes the state of the memory (full, empty, half-full, etc.) from an up / down counter (3909) which counts the number of words in the memory. If the memory is changed in blocks (stack on external stack write or read from external stack) the size of the block is given as a constant (3917) to an adder / subtractor (3910), to which the counter reading of 3909 is fed back. The result is loaded after 3909. This allows the counter reading to be quickly adapted to changes in blocks. (Of course it is possible to modify the counter with every word written or read in a block operation).
- a cache controller (3911) according to the prior art is available for cache operations, to which a tag memory (3912) is assigned. Depending on the operating mode, the value of 3911 or 3906 is sent to the outside via a multiplexer (3913) as an address (3914). The data is routed to the outside via bus 3915 and the data is exchanged with the array via bus 3916.
- a module can be declared as follows:
- module examplel input (varl, var2: tyi; var3: ty 2 ).
- register ⁇ regnamel> (resl).
- register ⁇ regname2> (res2).
- module marks the beginning of a module.
- input / output defines the input / output variables with the types ty n . begin ... end mark the fuselage of the module.
- register ⁇ regnamel / 2> transfers the result to the output, whereby the result is buffered in the register specified by ⁇ regnamel / 2>.
- ⁇ regnamel / 2> is a global reference to a specific register.
- fifo ⁇ fifoname> the data being transferred to a memory which works according to the FIFO principle.
- ⁇ fifoname> is a global reference to a specific memory working in FIFO mode. terminate @ is extended by the parameter or the signal "fifofull", which indicates that the memory is full.
- stack ⁇ stackname> where the data is transferred to a memory that works according to the stack principle.
- ⁇ stackname> is a global reference to a specific memory working in stack mode.
- terminate ⁇ distinguishes the programming according to the inventive method from the conventional sequential programming.
- the command defines the termination criterion of the module.
- the result variables resl and res2 are not evaluated by terminate ⁇ with their actual value, instead only the validity of the variables (i.e. their status signal) is checked. To do this, the two
- register is defined via input data.
- ⁇ regnamel> is the same as in examplel. " This causes the register that takes the output data in examplel to provide the input data for example2.
- fifo defines a FIFO memory with a depth of 256 for the output data resl.
- the full flag (fifofull) of the FIFO memory is used as a termination criterion in terminate ⁇ .
- module main input inl, in2: tyi; in3: ty 2 ).
- output output (outl: ty 4 ).
- signal defines a signal as an output signal without using buffering.
- the main module is terminated by terminate ⁇ (example2) as soon as the subroutine example2 terminates.
Abstract
Description
Claims
Priority Applications (11)
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EP00943684.1A EP1228440B1 (de) | 1999-06-10 | 2000-06-13 | Sequenz-partitionierung auf zellstrukturen |
JP2001503066A JP2003505753A (ja) | 1999-06-10 | 2000-06-13 | セル構造におけるシーケンス分割方法 |
US10/009,649 US8230411B1 (en) | 1999-06-10 | 2000-06-13 | Method for interleaving a program over a plurality of cells |
AU58053/00A AU5805300A (en) | 1999-06-10 | 2000-06-13 | Sequence partitioning in cell structures |
DE10081643T DE10081643D2 (de) | 1999-06-10 | 2000-06-13 | Sequenz-Partitionierung auf Zellstrukturen |
US12/720,898 US8726250B2 (en) | 1999-06-10 | 2010-03-10 | Configurable logic integrated circuit having a multidimensional structure of configurable elements |
US12/840,559 US20110012640A1 (en) | 1999-06-10 | 2010-07-21 | Configurable logic integrated circuit having a multidimensional structure of configurable elements |
US12/840,477 US8312200B2 (en) | 1999-06-10 | 2010-07-21 | Processor chip including a plurality of cache elements connected to a plurality of processor cores |
US14/276,449 US9690747B2 (en) | 1999-06-10 | 2014-05-13 | Configurable logic integrated circuit having a multidimensional structure of configurable elements |
US15/629,720 US10409765B2 (en) | 1999-06-10 | 2017-06-21 | Method for providing subapplications to an array of ALUs |
US16/547,796 US20200057749A1 (en) | 1999-06-10 | 2019-08-22 | Method for providing subapplications to an array of alus |
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US12/720,898 Continuation US8726250B2 (en) | 1999-06-10 | 2010-03-10 | Configurable logic integrated circuit having a multidimensional structure of configurable elements |
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USRE44383E1 (en) | 1997-02-08 | 2013-07-16 | Martin Vorbach | Method of self-synchronization of configurable elements of a programmable module |
USRE45109E1 (en) | 1997-02-08 | 2014-09-02 | Pact Xpp Technologies Ag | Method of self-synchronization of configurable elements of a programmable module |
USRE45223E1 (en) | 1997-02-08 | 2014-10-28 | Pact Xpp Technologies Ag | Method of self-synchronization of configurable elements of a programmable module |
US8869121B2 (en) | 2001-08-16 | 2014-10-21 | Pact Xpp Technologies Ag | Method for the translation of programs for reconfigurable architectures |
US8914590B2 (en) | 2002-08-07 | 2014-12-16 | Pact Xpp Technologies Ag | Data processing method and device |
Also Published As
Publication number | Publication date |
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US20110012640A1 (en) | 2011-01-20 |
DE10081643D2 (de) | 2002-05-29 |
US20140337601A1 (en) | 2014-11-13 |
US8726250B2 (en) | 2014-05-13 |
US10409765B2 (en) | 2019-09-10 |
US20170286364A1 (en) | 2017-10-05 |
JP2003505753A (ja) | 2003-02-12 |
US20150100756A9 (en) | 2015-04-09 |
WO2000077652A2 (de) | 2000-12-21 |
AU5805300A (en) | 2001-01-02 |
US20100228918A1 (en) | 2010-09-09 |
EP1228440B1 (de) | 2017-04-05 |
US8312200B2 (en) | 2012-11-13 |
CN1378665A (zh) | 2002-11-06 |
WO2000077652A3 (de) | 2002-04-25 |
US20200057749A1 (en) | 2020-02-20 |
US8230411B1 (en) | 2012-07-24 |
US9690747B2 (en) | 2017-06-27 |
EP1228440A2 (de) | 2002-08-07 |
US20100287324A1 (en) | 2010-11-11 |
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