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データシートサーチシステム |
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データシートサーチシステム |
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DP83821 データシート(PDF) 24 Page - National Semiconductor (TI) |
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DP83821 データシート(HTML) 24 Page - National Semiconductor (TI) |
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24 / 86 page  3.0 Functional Description (Continued) 24 www.national.com Figure 3-12 Ring Descriptor Organization 3.13.2.4 Descriptor Lists Descriptors may also be organized in linked lists using the link field. The linked list may be terminated by either a NULL link field, or by using the descriptor OWN bit. A list of descriptors may represent any number of packets or packet fragments. Care should be used when implementing a linked list terminated by a NULL link as there is a potential for driver software and the device to get out of sync. Before clearing a link field when freeing up descriptors, the driver should verify that the device has already traversed the link. Figure 3-13 Linked List Descriptor Organization 10180 addr 10140 10140 addr 10100 101C0 addr 10180 10100 addr 101C0 Descriptors Organized in a Ring (Recommended Method) 10180 addr 10140 10140 addr 10100 101C0 addr 10180 addr 101C0 Linked List terminated by OWN bit 10180 addr 10140 10140 addr 10100 101C0 addr 10180 00000 addr 101C0 Linked List terminated by NULL link field own !own own own |
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