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LAN91C100FD 数据表(PDF) 45 Page - SMSC Corporation |
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LAN91C100FD 数据表(HTML) 45 Page - SMSC Corporation |
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45 / 79 page  FEAST Fast Ethernet Controller with Full Duplex Capability SMSC DS – LAN91C100FD Rev. D Page 45 Rev. 10/14/2002 PRELIMINARY ISR Save Bank Select & Address Ptr Registers Mask SMC91C100FD Interrupts Read Interrupt Register Call TX INTR or TXEMPTY INTR TX INTR? Get Next TX RX INTR? Yes No No Yes Call RXINTR ALLOC INTR? No Yes Write Allocated Pkt # into Packet Number Reg. Write Ad Ptr Reg. & Copy Data & Source Address Enqueue Packet Packet Available for Transmission? Yes No Call ALLOCATE EPH INTR? No Yes Call EPH INTR Set "Ready for Packet" Flag Return Buffers to Upper Layer Disable Allocation Interrupt Mask Restore Address Pointer & Bank Select Registers Unmask SMC91C100FD Interrupts Exit ISR Figure 5.3 - Interrupt Service Routine |
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