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CIRCC Datasheet(PDF) 61 Page - SMSC Corporation |
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CIRCC Datasheet(HTML) 61 Page - SMSC Corporation |
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61 / 70 page  61 PROGRAMMED I/O Programmed I/O mode is selected when the DMA Enable bit in SCE Configuration Register B is zero. The CIrCC also supports String Move timing which is a block-mode programmed I/O operation that utilizes IOCHRDY to control the transfer (Figure 28). String Move mode is selected when the String Move bit in SCE Configuration Register B is one. Polling Interface Programmed I/O without IOCHRDY requires polling the FIFO status flags before reading or writing FIFO data. The Receiver interface depends upon the FIFO Not Empty flag. If FIFO Not Empty is true, there is read data available in the FIFO (Figure 29). The Transmitter interface depends upon the FIFO Full flag. If FIFO Full is false, there is room for write data in the FIFO (Figure 30). DMA Enable DRQ TC FIFO NOT EMPTY DMA Burst Refresh Interval Rx Enable FIGURE 27 - DMA BURST MODE RECEIVE TIMING FIFO Not Empty IOCHRDY IOR String Move AEN FIGURE 28 - STRING MOVE TIMING |
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