Technical information

2-9
Receive Architecture
The AIC-6915 provides address filters that have an effect on which receive frames are
accepted and how they are processed. For more information on address filtering, refer to
Address Filtering Registers on page 7-82.
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Table 2-9. Receive Completion Descriptor (Word 2)
Bit(s) Description/Function
Partial TCP/UDP checksum field
31:16
Partial TCP/UDP Checksum
- When fragmented TCP/UDP frames are received, the
partial TCP/UDP checksum of the first frame is calculated by the TCP/UDP header
and data. The partial TCP/UDP checksum for subsequent frames is calculated by the
TCP/UDP data only
VLan + Priority field
15:0
VLanID + Priority
- This field contains bytes 13 and 14 of the IEEE 802.1Q compliant
frame.
Table 2-10. Receive Completion Descriptor (Word 3)
Bit(s) Description/Function
Timestamp field
31:0
TimeStamp
- Time stamp value at the completion of the received frame.