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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN91C95 датащи(PDF) 73 Page - SMSC Corporation |
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LAN91C95 датащи(HTML) 73 Page - SMSC Corporation |
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73 / 144 page  73 I/O SPACE - BANK2 OFFSET NAME TYPE SYMBOL 4 FIFO PORTS REGISTER READ ONLY FIFO This register provides access to the read ports of the Receive FIFO and the Transmit completion FIFO. The packet numbers to be processed by the interrupt service routines are read from this register. HIGH BYTE REMPTY RX FIFO PACKET NUMBER 1 0 0 0 0 0 0 0 LOW BYTE TEMPTY TX DONE PACKET NUMBER 1 0 0 0 0 0 0 0 REMPTY - No receive packets queued in the RX FIFO. For polling purposes, uses the RCV_INT bit in the Interrupt Status Register. TOP OF RX FIFO PACKET NUMBER - Packet number presently at the output of the RX FIFO. Only valid if REMPTY is clear. The packet is removed from the RX FIFO using MMU Commands 3) or 4). TEMPTY - No transmit packets in completion queue. For polling purposes, uses the TX_INT bit in the Interrupt Status Register. TX DONE PACKET NUMBER - Packet number presently at the output of the TX Completion FIFO. Only valid if TEMPTY is clear. The packet is removed when a TX INT acknowledge is issued. NOTE: For software compatibility with future versions, the value read from each FIFO register is intended to be written into the PNR as is, without masking higher bits (provided TEMPTY and REMPTY = 0 respectively). |
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