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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83902AVF датащи(PDF) 46 Page - National Semiconductor (TI) |
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DP83902AVF датащи(HTML) 46 Page - National Semiconductor (TI) |
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46 / 70 page  130 Bus Arbitration and Timing (Continued) REMOTE DMA-BIDIRECTIONAL PORT CONTROL The Remote DMA transfers data between the local buffer memory and a bidirectional port (memory to IO transfer) This transfer is arbited on a byte by byte basis versus the burst transfer used for Local DMA transfers This bidirec- tional port is also readwritten by the host All transfers through this port are asynchronous At any one time trans- fers are limited to one direction either from the port to local buffer memory (Remote Write) or from local buffer memory to the port (Remote Read) Bus Handshake Signals for Remote DMA Transfers TLF11157 – 28 REMOTE READ TIMING 1 The DMA reads byteword from local buffer memory and writes byteword into latch increments the DMA address and decrements the byte count (RBCR0 1) 2 A Request Line (PRQ) is asserted to inform the system that a byte is available 3 The system reads the port the read strobe (RACK)is used as an acknowledge by the Remote DMA and it goes back to step 1 Steps 1 – 3 are repeated until the remote DMA is complete Note that in order for the Remote DMA to transfer a byte from memory to the latch it must arbitrate access to the local bus via a BREQ BACK handshake After each byte or word is transferred to the latch BREQ is dropped If a Local DMA is in progress the Remote DMA is held off until the local DMA is complete TLF11157 – 29 46 |
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