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DS3134 Datasheet(PDF) 106 Page - Dallas Semiconductor |
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DS3134 Datasheet(HTML) 106 Page - Dallas Semiconductor |
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106 / 203 page  DS3134 106 of 203 Empty Case The Receive Free Queue is considered empty when the read and write pointers are identical. Receive Free 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 Free 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 Free Queue Full State valid descriptor valid descriptor empty descriptor < write pointer read pointer > valid descriptor valid descriptor valid descriptor valid descriptor Table 8.1.3A describes the manner in which to calculate the absolute 32-bit address of the read and write pointers for the Receive Free Queue. Receive Free Queue Read/Write Pointer Absolute Address Calculation Table 8.1.3A Buffer Algorithm Large Absolute Address = Free Queue Base + Write Pointer * 8 Absolute Address = Free Queue Base + Read Pointer * 8 Small Absolute Address = Free Queue Base + Small Buffer Start * 8 + Write Pointer * 8 Absolute Address = Free Queue Base + Small Buffer Start * 8 + Read Pointer * 8 |
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