Method and apparatus for local memory and system bus refreshing

Details Method and apparatus for local memory and system bus refreshing Method and apparatus for local memory and system bus refreshing

1992-05-18

1995-09-05

Robertson, David L.

Boots, shoes, and leggings

395427, 364DIG1, 3642429, 36424292, 370 856, G06F 1300

Patent

active

054487420

ABSTRACT:
According to the invention, roughly described, the EISA arbitration scheme is used for arbitrating among a plurality of requestors for a system bus, the requestors including the CPU, a refresh controller, EISA devices and ISA/DMA devices. A refresh control signal is asserted if the refresh controller wins the arbitration, and a CAS# before RAS# refresh is performed on local memory in response to the refresh control signal after completion of any CPU access to local memory then taking place. The CPU can continue to access external cache during system bus refresh, and a CPU access to local DRAM is delayed only by the amount of time required for the shorter local DRAM refresh to complete.

REFERENCES:
patent: 4719621 (1988-01-01), May
patent: 4961167 (1990-10-01), Kumanoya et al.
patent: 4987529 (1991-01-01), Craft et al.
patent: 5175853 (1992-12-01), Kardach et al.
patent: 5265231 (1993-11-01), Nuwayser
patent: 5276888 (1994-01-01), Kardach et al.
patent: 5295110 (1994-03-01), Sakakibara
patent: 5343430 (1994-08-01), Furuyama
Intel Corp., 82350DT Eisa Chip Set (Sep. 1991).
Intel Corp., 82350 EISA Chip Set, Peripheral Components, Data Book (Jul. 1990).
Texas Instruments Corp., TACT84500 EISA Chip Set, Preview Bulletin (1991).
OPTI, Inc., OPTI-386WB PC/AT Chipset (82C391/82C392/82C206, Data Book, Version 1.2 (Mar. 28, 1991).
OPTI, Inc., HiD/386 AT Chipset High Integration Direct Mapped Cache AT 82C381/82C382D-25/33, Data Book (Nov. 1989).
Edward Solari, AT Bus Design, pp. 8-151 through 9-163 (Annabooks: 1990).

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