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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83902A датащи(PDF) 16 Page - National Semiconductor (TI) |
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DP83902A датащи(HTML) 16 Page - National Semiconductor (TI) |
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16 / 70 page  70 Packet Reception (Continued) LINKING RECEIVE BUFFER PAGES If the length of the packet exhausts the first 256-byte buffer the DMA performs a forward link to the next buffer to store the remainder of the packet For a maximum length packet the buffer logic will link six buffers to store the entire packet Buffers cannot be skipped when linking therefore a packet will always be stored in contiguous buffers Before the next buffer can be linked the Buffer Management Logic per- forms two comparisons The first comparison tests for equality between the DMA address of the next buffer and the contents of the Page Stop Register If the buffer ad- dress equals the Page Stop Register the buffer manage- ment logic will restore the DMA to the first buffer in the Receive Buffer Ring value programmed in the Page Start Address Register The second comparison tests for equality between the DMA address of the next buffer address and the contents of the Boundary Pointer Register If the two values are equal the reception is aborted The Boundary Pointer Register can be used to protect against overwriting any area in the receive buffer ring that has not yet been read When linking buffers buffer management will never cross this pointer effectively avoiding any overwrites If the buffer address does not match either the Boundary Pointer or Page Stop Address the link to the next buffer is per- formed Linking Receive Buffer Pages TLF11157 – 12 1) Check for e to PSTOP 2) Check for e to Boundary 16 |
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