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DS31256 数据表(PDF) 94 Page - Maxim Integrated Products |
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DS31256 数据表(HTML) 94 Page - Maxim Integrated Products |
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94 / 183 page  DS31256 256-Channel, High-Throughput HDLC Controller 94 of 183 Figure 9-6. Receive Free-Queue Structure Once the receive DMA is activated (by setting the RDE control bit in the master configuration register, see Section 5), it can begin reading data out of the free queue. It knows where to read data out of the free queue by reading the read pointer and adding it to the base address to obtain the actual 32-bit address. Once the DMA has read the free queue, it increments the read pointer by two dwords. A check must be made to ensure the incremented address does not equal or exceed either the receive free-queue small- buffer start address (in the case of the large buffer circular queue) or the receive free-queue end address (in the case of the small buffer circular queue). If the incremented address does equal or exceed either of these addresses, the incremented read pointer is set equal to 0000h. Base + 00h Base + 08h Base + 10h Base + 18h Base + 20h Base + End Address Free-Queue Large Buffer Host Write Pointer Free-Queue Large Buffer DMA Read Pointer Maximum of 65,536 Free-Queue Descriptors DMA Acquired Free-Queue Descriptor Free-Queue Small Buffer DMA Read Pointer Free-Queue Small Buffer Host Write Pointer Free-Queue Small Buffer Start Address Large Buffer Circular Queue Small Buffer Circular Queue Host Readied Free-Queue Descriptor DMA Acquired Free-Queue Descriptor DMA Acquired Free-Queue Descriptor DMA Acquired Free-Queue Descriptor DMA Acquired Free-Queue Descriptor DMA Acquired Free-Queue Descriptor Host Readied Free-Queue Descriptor Host Readied Free-Queue Descriptor Host Readied Free-Queue Descriptor Host Readied Free Queue Descriptor Host Readied Free-Queue Descriptor Host Readied Free-Queue Descriptor |
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