Static information storage and retrieval – Addressing – Multiple port access
Patent
1998-12-23
2000-03-14
Fears, Terrell W.
Static information storage and retrieval
Addressing
Multiple port access
36523003, G11C 1300
Patent
active
060381930
ABSTRACT:
A read system for a multi-ported register file includes a segmented bit line coupled to a global bit line. Each local bit line segment is coupled to a sub-set of the register files in a column to reduce device load and connection load. The local bit line segments are each coupled in series by local sense amps with the local bit line segment coupled to the input of a global sense amplifier. The number of cells coupled to the last bit line segment is more than the number of cells coupled to a bit line segment farthest from the global sense amplifier to balance device and interconnect load and provide for uniform read timing. Both the local bit line segments and global bit line are precharged prior to sensing a bit so that the local sense amplifiers do not require output pull-up transistors. This scheme will not work if the local sense amp includes a pull-up PMOS transistor at its output.
REFERENCES:
patent: 5493536 (1996-02-01), Aoki
Kant Shree
Wang Yong
Fears Terrell W.
Sun Microsystems Inc.
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