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DP8390D 数据表(PDF) 7 Page - National Semiconductor (TI) |
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DP8390D 数据表(HTML) 7 Page - National Semiconductor (TI) |
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7 / 56 page ![]() 60 Direct Memory Access Control (DMA) (Continued) Dual Bus System TLF8582 – 55 32-Bit DMA Operation TLF8582 – 6 70 Packet Reception The Local DMA receive channel uses a Buffer Ring Struc- ture comprised of a series of contiguous fixed length 256 byte (128 word) buffers for storage of received packets The location of the Receive Buffer Ring is programmed in two registers a Page Start and a Page Stop Register Ethernet packets consist of a distribution of shorter link control pack- ets and longer data packets the 256 byte buffer length pro- vides a good compromise between short packets and long- er packets to most efficiently use memory In addition these buffers provide memory resources for storage of back-to- back packets in loaded networks The assignment of buffers NIC Receive Buffer Ring TLF8582 – 7 7 |
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