Separate handling of read and write of read-modify-write

Details Separate handling of read and write of read-modify-write Separate handling of read and write of read-modify-write

2008-04-22

2008-04-22

Song, Jasmine (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S105000, C711S167000, C365S189050, C710S052000

Reexamination Certificate

active

07363442

ABSTRACT:
A method, an apparatus, and a computer program are provided for the separate handling of read and write operations of Read-Modify-Write Commands in an XDR™ memory system. This invention allows the system to issue other commands between the reads and writes of a RMW. This insures that the dataflow time from read to write is not a penalty. A RMW buffer is used to store the read data and a write buffer is used to store the write data. A MUX is used to merge the read data and the write data, and transmit the merged data to the target DRAM via the XIO. The RMW buffer can also be used for scrubbing commands.

REFERENCES:
patent: 6101614 (2000-08-01), Gonzales et al.
patent: 6370611 (2002-04-01), Callison et al.
patent: 6718444 (2004-04-01), Hughes
patent: 6973551 (2005-12-01), Walton
patent: 2005/0080953 (2005-04-01), Oner et al.
patent: 2006/0080589 (2006-04-01), Holm et al.

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