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DS3134 Datasheet(PDF) 132 Page - Dallas Semiconductor |
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DS3134 Datasheet(HTML) 132 Page - Dallas Semiconductor |
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132 / 203 page  DS3134 132 of 203 The Transmit DMA will read from the Transmit Pending Queue Descriptor circular queue which data buffers and their associated descriptors are ready for transmission. To keep track of the addresses of the circular queue in the Transmit Pending Queue, there are a set of internal addresses within the device that are accessed by both the Host and the DMA. On initialization, the Host will configure all of the registers shown in Table 8.2.3A. After initialization, the DMA will only write to (i.e. change) the read pointers and the Host will only write to the write pointers. Empty Case The Transmit Pending Queue is considered empty when the read and write pointers are identical. Transmit Pending Queue Empty State empty descriptor empty descriptor empty descriptor read pointer > empty descriptor < write pointer empty descriptor empty descriptor empty descriptor Full Case The Transmit Pending Queue is considered full when the read pointer is ahead of the write pointer by one descriptor. Hence, one descriptor must always remain empty. Transmit Pending 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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