In a cache tag integrated on an SRAM with a memory cache, laser fuses are
programmed to indicate which, if any, tag subarrays in the cache tag are
not functioning properly. In addition, the burst length of the SRAM is
increased to reduce the number of tag subarrays necessary for operation of
the cache tag so any nonfunctional tag subarrays are no longer necessary.
In accordance with the indications from the programmed laser fuses and the
increased burst length, logic circuitry disables any nonfunctional tag
subarrays, leaving only functional tag subarrays to provide tag
functionality for the memory cache. As a result, an SRAM that is typically
scrapped as a result of nonfunctional tag subarrays can, instead, be
recovered for sale and subsequent use.
