D1 -RXSRC, RECEIVE DMA SOURCE:
When set (logic 1), this bit allows the source for receive DMA to come from the W/REQB pin of channel B on the SCC. When cleared (logic 0), the source for receive DMA comes from the W/REQA pin of channel A on the SCC.
D0 -TXSRC, TRANSMIT DMA SOURCE:
When set (logic 1), this bit allows the source for transmit DMA to come from the DTR/REQA pin of channel A on the SCC. When cleared (logic 0), the source for transmit DMA comes from the W/REQA pin of channel A on the SCC.
NOTE:
If both D0 and D1 are cleared (logic 0), then the transmit and receive DMA requests both come from the W/REQA pin of channel A on the SCC. Proper board function is not guaranteed under this condition.
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