Hierarchical programming of electrically configurable integrated circuits
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United States of America Patent
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Mar 4, 1997
Grant Date -
N/A
app pub date -
Oct 23, 1995
filing date -
Oct 23, 1995
priority date (Note) -
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Abstract
A data-cascading hierarchically arranged electrically configurable logic device (ECD) system and an enable-cascading hierarchically arranged ECD system are provided. In both cases, the configuration bitstream includes a local count and at least one remainder count for each ECD. The local count determines the amount of configuration data to be stored locally. By setting this count to zero, an ECD can be bypassed. The remainder count determines the amount of data to be stored by devices down one hierarchical branch from the local ECD. By setting this count to zero, this branch can be bypassed and ECDs of a second branch can be configured sooner. In the data cascading system, the counts determine how data is routed through the ECDs. In the enable cascading system, the data is broadcast to all ECDs. The counts determine when and if the configuration enable inputs of downstream ECDs are to be activated.
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