| 摘要 |
A FIFO uses a fill indicator circuit to indicate a fill status and provide control signals to a data source and data sink to cease operation. A serial string of FIFO cells propagates data from input to output by sending request and acknowledge signals between adjacent cells. The request signal initiates data transfer to the next logical cell and the acknowledge signal indicates completion of the transfer. The fill indicator has one cell for each FIFO cell for monitoring the request and acknowledge signals looking for predetermined state sequences to indicate whether each FIFO cell is full or empty.
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