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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CIRCC датащи(PDF) 63 Page - SMSC Corporation |
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CIRCC датащи(HTML) 63 Page - SMSC Corporation |
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63 / 70 page  63 Receive Receiving messages with Programmed I/O using FIFO Interrupt requires reading a fixed number of data bytes, usually related to the threshold, whenever the FIFO Interrupt becomes active. An appropriate FIFO Threshold value allows the host to efficiently satsify the FIFO service requests until the message reception is complete. IOCHRDY Time-out In programmed I/O mode when AEN = low and String Move = active, IOCHRDY can be used to slightly extend the access cycle if the FIFO is temporarily unable to fulfill the transfer request (Figure 33). If IOCHRDY remains inactive for more than 10Fs, a time-out error occurs and subsequent IOCHRDY cycles are prevented until the string move bit is specifically reactivated. Because of the 10Fs IOCHRDY time-out, it is recommended that string move timing only be used for 1.152 Mbps transfers and above. DMA Enable IOW String Move Tx Enable TxServReq FIFO Int. Enable FIFO Interrupt Data Done EOM Interrupt FIGURE 31 - INTERRUPT DRIVEN PROGRAMMED I/O TRANSMIT TIMING DMA Enable IOR String Move Rx Enable RxServReq FIFO Int. Enable FIFO Interrupt EOM Interrupt FIGURE 32 - INTERRUPT DRIVEN PROGRAMMED I/O RECEIVE TIMING |
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