Logic block for programmable logic devices
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United States of America Patent
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Jul 7, 1992
Issued Date -
N/A
app pub date -
Aug 8, 1991
filing date -
Sep 29, 1989
priority date (Note) -
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status (Latency Note)
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Abstract
A standard logic block, or macrocell, is provided for use on programmable logic devices. The macrocell uses RAM to perform logic functions, and further includes circuitry which allows writing of data to the RAM during use. Each logic block can be configured at programming time to be either a user RAM, allowing the user to write data to such memory during use, or configured as performing logic functions. The contents of macrocells configured as providing logic functions cannot be changed except by reprogramming the device.
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