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DP83821 Fiches technique(PDF) 32 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce DP83821
Description  10/100/1000 Mb/s PCI Ethernet Network Interface Controller
PDF  86 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83821 Fiches technique(HTML) 32 Page - National Semiconductor (TI)

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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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