High-speed transfer of data between a PC compatible microcomputer and a bus ...

[54] HIGH-SPEED TRANSFER OF DATA BETWEEN A PC COMPATD3LE MICROCOMPUTER AND A BUS DEVICE

[75] Inventors: Raghu Sharma, North Oaks; Steven A.

Tuckner. Lake Elmo, both of Minn.

[73] Assignee: Multi-Tech Systems, Inc., Mounds
View, Minn.

[21] AppL No.: 774y469
[22] Filed: Oct 10,1991

[51] Int CL6 G06F 3/00

[52] U.S. CI 395/250

[58] Field of Search 395/650, 575,

395/250

[56] References Cited

U.S. PATENT DOCUMENTS

4,523,055 6/1985 Hohletal 179/2

4,663,777 5/1987 Szeto 379/88

4,701,845 10/1987 Andreasen et al 395/575

4,864,601 9/1989 Berry 379/96

5,192,999 3/1993 Graczyk et al 358/85

FOREIGN PATENT DOCUMENTS

8313583 10/1983 Australia. 2025157 1/1990 Japan.

OTHER PUBLICATIONS

Copy of an abstract of JP 2025157, published Jan. 26,1990, searched from World Patents Index.

Copy of an abstract of AU 8313583, published Oct 27, 1983, searched from British Library through Patent Express.

Multi-Tech Systems, Inc., "The New Intelligent Serial Interface", Jan., 1991, product brochure.

Comdex, Fall 1990, Las Vegas, NV, Nov. 12-16, trade show.

Comdex, Spring 1991, Atlanta, GA, May 20-23, trade show.

TCA 1991, San Diego, CA, Sep. 24-26, trade show.

Primary Examiner—Parshotam S. Lall

Attorney, Agent, or Firm—Schwegman, Lundberg,

Woessner & Kluth, P.A.

[57] ABSTRACT

A method for the high-speed transfer of data between an IBM compatible personal computer (PC) and a bus device. A DMA controller is placed on the bus device to by-pass the PC's DMA controller. High-level terminate and stay resident software on the PC uses a combination of the DMA controller on the bus device and low level DMA controller routines to transfer the data between the PC and the bus device.

2 Claims, 5 Drawing Sheets