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DS3134 датащи(PDF) 112 Page - Dallas Semiconductor |
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DS3134 датащи(HTML) 112 Page - Dallas Semiconductor |
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112 / 203 page ![]() DS3134 112 of 203 The Receive Done Queue is circular queue. To keep track of the addresses of the circular queue in the Receive Done Queue, there are a set of internal addresses within the device that accessed by both the Host and the DMA. On initialization, the Host will configure all of the registers shown in Table 8.1.4A. After initialization, the DMA will only write to (i.e. change) the write pointer and the Host will only write to the read pointer. Empty Case The Receive Done Queue is considered empty when the read and write pointers are identical. Receive Done Queue Empty State empty descriptor empty descriptor empty descriptor read pointer > empty descriptor < write pointer empty descriptor empty descriptor empty descriptor Full Case The Receive Done Queue is considered full when the read pointer is ahead of the write pointer by one descriptor. Hence, one descriptor must always remain empty. Receive Done Queue Full State valid descriptor valid descriptor empty descriptor < write pointer read pointer > valid descriptor valid descriptor valid descriptor valid descriptor |
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