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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN89218 датащи(PDF) 57 Page - Microchip Technology |
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LAN89218 датащи(HTML) 57 Page - Microchip Technology |
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57 / 148 page  2008-2015 Microchip Technology Inc. DS60001255B-page 57 LAN89218 3.13.1 RX SLAVE PIO OPERATION Using PIO mode, the host can either implement a polling or interrupt scheme to empty the received packet out of the RX data FIFO. The host will remain in the idle state until it receives an indication (interrupt or polling) that data is available in the RX data FIFO. The host will then read the RX status FIFO to get the packet status, which will contain the packet length and any other status information. The host should perform the proper number of reads, as indicated by the packet length plus the start offset and the amount of optional padding added to the end of the frame, from the RX data FIFO. FIGURE 3-25: HOST RECEIVE ROUTINE USING INTERRUPTS FIGURE 3-26: HOST RECEIVE ROUTINE WITH POLLING Not Last Packet Idle Read RX Status DWORD init Read RX Packet Last Packet RX Interrupt Read RX_FIFO_ INf Read RX Status DWORD init Read RX Packet Last Packet Not Last Packet Valid Status DWORD |
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