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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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DP83821 데이터시트(PDF) 32 Page - National Semiconductor (TI) |
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DP83821 데이터시트(HTML) 32 Page - National Semiconductor (TI) |
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32 / 86 page  3.0 Functional Description (Continued) 32 www.national.com 3.13.5.2 Receive Data Flow with Priority Queueing With Priority Queueing, it is still necessary to pre-allocate buffers and descriptors. Each priority queue must have a separate list of descriptors allocated. The receive data flow is similar to the above with the following exceptions: — The Receive state machine waits until packet data is available, and the priority for the packet has been determined from a VLAN tag (assumes priority 0 if no tag is present). Using this information, the receive state machine will then process descriptors as detailed above. — If no descriptors are available for the priority queue matching the packet priority, the state machine will wait for the system to append more descriptors to the descriptor list and pulse the CR:RXEN and CR:RXPRI controls. — If no descriptors are available for the priority queue matching the packet priority, the state machine will wait for the system to append more descriptors to the descriptor list and pulse the CR:RXEN and CR:RXPRI controls. |
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