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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN91C100FD датащи(PDF) 49 Page - SMSC Corporation |
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LAN91C100FD датащи(HTML) 49 Page - SMSC Corporation |
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49 / 79 page  FEAST Fast Ethernet Controller with Full Duplex Capability SMSC DS – LAN91C100FD Rev. D Page 49 Rev. 10/14/2002 PRELIMINARY Figure 5.7 - Drive Send and Allocate Routines 5.5 Memory Partitioning Unlike other controllers, the LAN91C100FD does not require a fixed memory partitioning between transmit and receive resources. The MMU allocates and de-allocates memory upon different events. An additional mechanism allows the CPU to prevent the receive process from starving the transmit memory allocation. ALLOCATE Issue "Allocate Memory" Command to MMU Read Interrupt Status Register Enqueue Packet Set "Ready for Packet" Flag Return Copy Remaining TX Data Packet into RAM Return Buffers to Upper Layer Write Allocated Packet into Packet # Register Write Address Pointer Register Copy Part of TX Data Packet into RAM Write Source Address into Proper Location Store Data Buffer Pointer Clear "Ready for Packet" Flag Enable Allocation Interrupt Allocation Passed? Yes No DRIVER SEND Choose Bank Select Register 2 Call ALLOCATE Exit Driver Send Read Allocation Result Register |
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