|Publication number||USRE41878 E1|
|Application number||US 12/505,670|
|Publication date||Oct 26, 2010|
|Filing date||Jul 20, 2009|
|Priority date||May 12, 2004|
|Also published as||US7248470, US20050277337|
|Publication number||12505670, 505670, US RE41878 E1, US RE41878E1, US-E1-RE41878, USRE41878 E1, USRE41878E1|
|Inventors||Yu-Guang Chen, Ying-Chun Tseng|
|Original Assignee||Asustek Computer Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Classifications (12), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
(1) Field of the Invention
This invention relates to a computer system with a peripheral component interconnect Express (PCI Express) interface, more particularly to a computer system adapting a high speed PCI Express interfaced apparatus to a relative low speed PCI Express connector.
(2) Description of Related Art
A computer system typically includes a main board with a system bus formed thereon as a basic component. Various devices including the central processing unit (CPU), the chipset, and memory on the main board are communicated with each other. The chipset plays an important role in ruling signal and data transmission through the system bus and some periphery buses. In the art, the choice of chipset is highly related to that of the CPU. In addition, there are also various connectors utilizing the periphery buses for connecting periphery components such as the displaying card, hard disks, floppy disks, CDROM, etc.
The AGP interface, which is developed to meet the need of handling huge data streams resulted from texture mapping in 3D imaging, is provided to overcome the transmission speed limitation of a traditional PCI interfaced displaying card. However, some advance PCI interfaced periphery components, such as small computer systems interface (SCSI) hard disks with ultra 320 standard and Ethernet adapters supporting transmission speed up to 10 GB, is not compatible with the AGP interface. Also, the operation of those PCI interfaced periphery components may surpass the allowable transmission speed of the traditional PCI interface. Therefore, as a result, a new I/O port interface, i.e. the PCI Express interface, is introduced.
The PCI Express interface, which is developed to replace traditional PCI interfaces, is provided with high transmission speed and great extensibility. For a better understanding, a typical computer system with a PCI Express interface is shown in FIG. 2. The chipset 110 in the computer system may connect to a PCI Express connector 330 with or without a switch 320, and further connect to some traditional PCI connectors 350 by using a bridge 340. Upon such an arrangement, the PCI Express interface can support traditional PCI interfaced apparatus and have potential to replace the PCI interface, or even the AGP interface.
The PCI Express interface featuring a serial point to point connection utilizes a low voltage differential signal (LVDS) (using two transmission lines to create a voltage differential to represent logic signal 0 or 1) transmission to increase the transmission speed with a reduced noise. Under the technique standard of the PCI Express interface, a basic PCI Express link specifies two LVDS, one for transmitting signals, and another for receiving signals. Such a link is also represented as a “lane” with a standardized bit rate of 2.5 Gbps.
As mentioned, it is known that the bandwidth as well as the transmission speed of the PCI Express interface is decided by the amount of lanes, and the increase in lanes implies an increase of contacts within the PCI Express connector. Moreover, it is disclosed that the PCI Express connector may have 1, 2, 4, 8, 12, 16, or 32 lanes and may have a selectable bandwidth ranged from 2.5 Gbps to 80 Gbps.
As mentioned above and according to
Accordingly, by compared to the 1×PCI daughter board, the 4×PCI daughter board has a wider connecting portion for receiving the contacts of a connector. Therefore, though the PCI Express connector with a preset bandwidth can mate with a PCI Express daughter board with a relative bigger bandwidth, yet such a PCI Express daughter board is still far to be acceptable.
Moreover, the bandwidth of a PCI Express connector provided on the prior art main board is always identical to the maximum supporting bandwidth of the PCI Express controller inside the chipset. Thus, only the PCI Express daughter board with a smaller bandwidth with respect to the PCI Express controller on the main board is applicable. For example, in the case that the chipset on the main board supports only 1×PCI Express interface, a 1×PCI Express interface connector is definitely the only choice. At this time, a 2×PCI Express daughter board who has a bigger bandwidth cannot be accepted in this connector. It is why the misunderstanding that a PCI Express controller cannot operate with a PCI Express daughter board with a bigger bandwidth happens to retard the development of some periphery apparatuses utilizing the PCI Express daughter board.
Therefore, it is definitely of great demand upon how to break the limitation by the chipset standard so as to allow a PCI Express daughter board with a bigger bandwidth to be compatible with a PCI Express controller and a respective connector with a smaller lane.
A main object of the present invention is to provide a PCI Express connector, which has a preset number of contacts for supporting a preset bandwidth, for accepting a PCI Express daughter board with a bigger bandwidth with respect to the preset bandwidth.
In accordance with the present invention, the computer system comprises a chipset, a PCI Express connector with a preset bandwidth, and a PCI Express daughter board with a bigger bandwidth by comparing to the preset bandwidth. The chipset is provided with a PCI Express controller having the preset bandwidth and electrically connecting to the PCI Express connector. The PCI Express connector has a trench on a sidewall thereof. A connecting portion of the PCI Express daughter board, having a number of golden fingers for excessively supporting the bandwidth thereon, is extended through the trench to expose part of the PCI Express connector.
In an embodiment of the present invention, the PCI Express connector has a fixing structure formed in the trench to fixing the daughter board.
In an embodiment of the present invention, the PCI Express connector has slits at an edge thereof. As the PCI Express daughter board is forced into the PCI Express connector, the slits are split to form a trench at the edge for accepting the connecting portion with some additional golden fingers thereon extending therethrough.
Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings, which are given by way of illustration only, and thus are not limitative of the present invention, and in which.
As shown in
Moreover, it is noted that, as the PCI Express daughter board 500 is mated with the PCI Express connector 400 of the present invention, the golden fingers 520a and 520b of the PCI Express daughter board 500 cannot be totally accepted in the slot 420 because of a mismatch of contact numbers according to FIG. 3 and FIG. 4. As shown in
It is also noted that, according to the contact definition tables of FIG. 12 and
Because of the irregular connection in between, the PCI Express connector 400 may need an additional fixing structure to hold the PCI Express daughter board 500. Referring to
As shown in
According to the above-mentioned embodiments, it is noted that a PCI Express connectors in accordance with the present invention can be used in the electronic system to accept a PCI Express daughter board with a bigger bandwidth without considering how many lanes the PCI Express connector supports.
Accordingly, the PCI Express connector 400 in accordance with the present invention features a trench 450 to accept the wider connecting portion 510 of the PCI Express daughter board 500 with a bigger bandwidth. Thus, users may choose a faster PCI Express daughter board without regarding whether the chipset on the main board support or not.
With the example and explanations above, the features and spirits of the invention will be hopefully well described. Those skilled in the art will readily observe that numerous modifications and alterations of the device may be made when retaining the teaching of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US6402542 *||Feb 28, 2001||Jun 11, 2002||Hon Hai Precision Ind. Co., Ltd.||Electrical connector|
|US7021971 *||Feb 12, 2004||Apr 4, 2006||Super Talent Electronics, Inc.||Dual-personality extended-USB plug and receptacle with PCI-Express or Serial-At-Attachment extensions|
|US20050079743 *||Jan 19, 2004||Apr 14, 2005||Ren-Ting Hou||Extendable computer system|
|US20050228932 *||Apr 8, 2005||Oct 13, 2005||Asrock Incorporation||Computer system with a PCI express interface|
|US20100062649 *||Jul 10, 2007||Mar 11, 2010||Leon Wu||Edge connector|
|U.S. Classification||361/679.41, 439/607.1, 174/255, 710/307, 29/426.5|
|International Classification||H01R24/00, H01R27/00, G06F1/16|
|Cooperative Classification||Y10T29/49822, H01R12/721, H01R27/00|
|Dec 22, 2010||FPAY||Fee payment|
Year of fee payment: 4
|Dec 31, 2014||FPAY||Fee payment|
Year of fee payment: 8