Electrical computers and digital data processing systems: input/ – Input/output data processing – Direct memory accessing
Reexamination Certificate
2007-04-02
2009-06-09
Peyton, Tammara (Department: 2182)
Electrical computers and digital data processing systems: input/
Input/output data processing
Direct memory accessing
C710S005000, C710S020000, C710S024000, C710S062000, C710S312000
Reexamination Certificate
active
07546393
ABSTRACT:
The present invention provides for a system comprising a DMA queue configured to receive a DMA command comprising a tag, wherein the tag belongs to one of a plurality of tag groups. A counter couples to the DMA queue and is configured to increment a tag group count of the tag group to which the tag belongs upon receipt of the DMA command by the DMA queue and to decrement the tag group count upon execution of the DMA command. A tag group count status register couples to the counter and is configured to store the tag group count for each of the plurality of tag groups. And the tag group count status register is further configured to receive a request for a tag group status and to respond to the request for the tag group status.
REFERENCES:
patent: 6205494 (2001-03-01), Williams
patent: 6324598 (2001-11-01), Olson et al.
patent: 6609192 (2003-08-01), Guthrie et al.
patent: 6983452 (2006-01-01), Willems
patent: 7200688 (2007-04-01), Day et al.
patent: PCT/IB2005/003974 (2005-07-01), None
Day Michael Norman
Hofstee Harm Peter
Johns Charles Ray
Liu Peichum Peter
Truong Thuong Quang
Carr LLP
International Business Machines - Corporation
Peyton Tammara
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