Raster operations unit with interleaving of read and write...

Details Raster operations unit with interleaving of read and write... Raster operations unit with interleaving of read and write...

2006-08-24

2011-10-11

Hsu, Joni (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics display memory system

Graphic display memory controller

C345S520000, C345S537000

Reexamination Certificate

active

08035647

ABSTRACT:
A raster operations (ROP) unit interleaves read and write requests for efficiently communicating with a frame buffer via a PCI Express (PCI E) link or other system bus that provides separate upstream and downstream data transfer paths. One example of a ROP unit processes pixels in groups, performing read modify writeback sequences for each group. The read requests associated with pixels in a second group are advantageously interleaved with the writeback requests for pixels in the first group prior to sending the requests on the system bus.

REFERENCES:
patent: 5801717 (1998-09-01), Engstrom et al.
patent: 5937204 (1999-08-01), Schinnerer
patent: 6801203 (2004-10-01), Hussain
patent: 7328956 (2008-02-01), Silverbrook et al.
patent: 7463819 (2008-12-01), Law et al.
patent: 7538772 (2009-05-01), Fouladi et al.

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