System and method for efficiently supporting access to I/O devic

Details System and method for efficiently supporting access to I/O devic System and method for efficiently supporting access to I/O devic

1990-01-02

1993-10-12

Dixon, Joseph L.

Boots, shoes, and leggings

364DIG1, 364DIG2, 36424344, 36424345, 3642436, 3642456, G06F 1208, G06F 1300

Patent

active

052533530

ABSTRACT:
A data processing system (10) includes a CPU (12) connected to a direct-mapped cache (14) by address bus (16) and data bus (18). The cache (14) includes a first-level cache (20) connected to a second-level cache (22) by address bus (24) and data bus (26). The second-level cache (22) of the cache (14) is connected to address bus (28) and data bus (30) by address bus (32) and data bus (34). The address and data busses (28) and (30) are connected to memory (36) and I/O device (41) by address bus (40), data bus (42), address bus (44) and data bus (46), respectively. In the system (10), I/O interface (38) decodes physical memory addresses and responds to addresses in specific ranges using first and second addresses alternately, which are chosen to collide in the data cache (14). I/O software alternates between the two addresses instead of alternating between a device register address and a reserved-region address as in prior art systems.

REFERENCES:
patent: 4802085 (1989-01-01), Levy et al.
Cousins, R., "DMA Considerations on RISC Workstations," Computer Architecture News, vol. 17, No. 5, Sep. 1989, pp. 16-23.
Tehranian, M. T., "Twin Cache Tags Enable Concurrent Micro/DMA Processing," Computer Design, vol. 24, No. 6, Jun. 1985, pp. 157-159.
Peterson, "System-Level Concerns Set Performance Gains," High Performance Systems, vol. 10, No. 9, Sep. 1989, pp. 71-77.

Affiliated with

Also associated with

Rating

System and method for efficiently supporting access to I/O devic does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System and method for efficiently supporting access to I/O devic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for efficiently supporting access to I/O devic will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1912630