Method and apparatus for performing maskable multiple color block writes
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United States of America Patent
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Jun 9, 1998
Issued Date -
N/A
app pub date -
Sep 20, 1995
filing date -
Jul 7, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Circuitry for performing a memory block write is described. The memory block includes b block words, each block word having t block bytes. Each block byte has s bits of memory. Each block byte is associated with at least two associated mask value bits. A constant register has at least s.times.t bits of memory arranged as t constant bytes, each constant byte storing a constant value, each constant byte associated with one block of every block word. The block write circuitry includes control circuitry for selecting one of a normal write function and a block write function in accordance with a block write signal. When the block write function is selected, the control circuitry stores the associated constant value in every nonmasked block byte substantially simultaneously in accordance with a value of the associated mask value bits.
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