Memory request timing randomizer

Details Memory request timing randomizer Memory request timing randomizer

2006-07-25

2006-07-25

Tung, Kee M. (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics display memory system

Graphic display memory controller

C345S558000

Reexamination Certificate

active

07081896

ABSTRACT:
Methods and apparatus for changing the timing of memory requests in a graphics system. Reading data from memory in a graphics system causes ground bounce and other electrical noise. The resulting ground bounce may be undesirably synchronized with a video retrace signal sent to a display, and may therefore cause visible artifacts. Embodiments of the present invention shift requests made by one or more clients by a duration or durations that vary with time, thereby changing the timing of the data reads from memory. The requests may be shifted by a different duration for each memory request, for each frame, or multiples of requests or frames. The durations may be random, pseudo-random, or determined by another algorithm, and they may advance or delay the requests. By making the ground bounce and other noise asynchronous with the video retrace signal, these artifacts are reduced or eliminated.

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