Method and apparatus for monitoring a row address strobe signal

Details Method and apparatus for monitoring a row address strobe signal Method and apparatus for monitoring a row address strobe signal

1995-03-28

1997-10-21

Tung, Kee M.

Static information storage and retrieval

Magnetic bubbles

Guide structure

395501, 365193, 365203, 365205, 365233, G06F 1206

Patent

active

056805918

ABSTRACT:
A method and apparatus for integrating a row address strobe signal monitoring circuit in a graphics controller is described. The present invention includes an improved graphics controller comprising a bi-directional input/output pad and a row address strobe signal snooping circuit to monitor the row address strobe signal to detect the pre-charge status of the signal prior to a memory access by the graphics controller. The input/output pad of the present invention enables the graphics controller to simultaneously receive and drive a row address strobe signal upon being granted permission to access memory. The row address snooping method of the present invention enables the graphics controller to pre-charge the row address strobe signal while the controller is in an inactive memory access state. Pre-charging the row address signal allows the graphics controller to immediately drive a pre-charged address strobe signal to memory upon receiving permission to access memory; thereby reducing the number of clocks it takes the graphics controller to access memory.

REFERENCES:
patent: 5185719 (1993-02-01), Dhong et al.
patent: 5335322 (1994-08-01), Mattison
patent: 5479635 (1995-12-01), Kametani

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