Distributed random access memory in a programmable logic device
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United States of America Patent
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Dec 4, 2007
Grant Date -
N/A
app pub date -
Jun 16, 2006
filing date -
Jul 22, 2004
priority date (Note) -
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Abstract
Distributed random access memory in a programmable logic device uses configuration RAM bits as bits of the distributed RAM. A single write path is used to provide both configuration data and user write data. Selection circuitry, such as a multiplexer, is used to determine whether the single write path carries configuration data or user write data. In another aspect of the invention, the configuration RAM bits are used as to construct a shift register by adding pass transistors to chain the configuration RAM bits together, and clocking alternate pass transistors with two clocks 180.degree. out of phase with one another.
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