| 摘要 |
A look-ahead method and apparatus for monitoring the number of bytes in a FIFO memory. The apparatus uses look-ahead techniques to determine all possible results and then selects the appropriate result from all of the possible results to update a byte count register. The selection is based on the number of bytes READ and the number of bytes WRITTEN during a FIFO memory cycle. This look-ahead method and apparatus provides a definite time advantage over known FIFO monitoring systems that perform an addition or subtraction with the READs and WRITEs at the end of each FIFO cycle, and then use the arithmetic result to update a byte count register.
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