Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1995-08-24
1996-07-16
Beausoliel, Jr., Robert W.
Static information storage and retrieval
Magnetic bubbles
Guide structure
365200, 3642384, 36424291, 364DIG1, G06F 1100
Patent
active
055376657
ABSTRACT:
An apparatus and method for controlling the initialization of shifting circuitry which provides column redundancy for multiple banks of cache memory on-board a microprocessor. Upon sensing deassertion of a reset signal, a master controller supplies non-overlapping two phase clock signals to one bank controller for each bank of the cache memory. Each bank has a set of fuses which supply a bank shift location to the bank controller indicating the location of a bad column in the bank. The master controller also activates a pre-loadable counter which provides each bank controller with a signal which counts down to zero from half the maximum number of columns in a bank. Each bank controller then provides the shifting signals necessary to initialize the shifting circuitry for its bank. In this way, defective columns located in different positions in each bank can be replaced by redundant paths, thereby repairing the cache and increasing the manufacturing yield of microprocessors with an on-board cache memory.
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Malamy Adam
Patel Rajiv N.
Beausoliel, Jr. Robert W.
Le Dieu-Minh
Sun Microsystems Inc.
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