Compression tag state interlock

Details Compression tag state interlock Compression tag state interlock

2006-09-18

2010-10-05

Wu, Xiao M (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics display memory system

First in first out

C345S555000, C345S556000, C711S163000

Reexamination Certificate

active

07808507

ABSTRACT:
Systems and methods for determining a compression tag state prior to memory client arbitration may reduce the latency for memory accesses. A compression tag is associated with each portion of a surface stored in memory and indicates whether or not the data stored in each portion is compressed or not. A client uses the compression tags to construct memory access requests and the size of each request is based on whether or not the portion of the surface to be accessed is compressed or not. When multiple clients access the same surface the compression tag reads are interlocked with the pending memory access requests to ensure that the compression tags provided to each client are accurate. This mechanism allows for memory bandwidth optimizations including reordering memory access requests for efficient access.

REFERENCES:
patent: 5263136 (1993-11-01), DeAguiar et al.
patent: 6810470 (2004-10-01), Wiseman et al.
patent: 2003/0030644 (2003-02-01), Wang et al.
patent: 2004/0091160 (2004-05-01), Hook et al.

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