Apparatus and method for controlling write access to a group...

Static information storage and retrieval – Addressing

Reexamination Certificate

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C365S230020, C365S189011, C365S189070

Reexamination Certificate

active

07859937

ABSTRACT:
An apparatus and method for controlling write access to a group of storage elements is provided. Each storage element within the group is identified by an n-bit address, and the total number of storage elements in the group is less than 2n. Write enable circuitry is responsive to an access request specifying an n-bit address to issue a write control signal to the storage element addressed by the access request in the event that the access request is a write access request. The write control signal causes a write to that addressed storage element to occur. The write enable circuitry comprises selective address modification circuitry for outputting as an internal address the unmodified n-bit address if the access request is a write access request, and for outputting as the internal address an n-bit unused address if the access request is not a write access request. Comparison circuitry then compares the internal address with the addresses of the storage elements in the group, and in the event of a match being detected, issues the write control signal to the corresponding storage element. Due to the selective modification performed by the selective address modification circuitry, a match will only be detected by the comparison circuitry for a write access request. This design enables a reduction in the size of the write enable circuitry to be achieved.

REFERENCES:
patent: 6442058 (2002-08-01), Mori
patent: 2005/0078548 (2005-04-01), Kang et al.
patent: 2009/0063808 (2009-03-01), Matsuyama et al.

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