Technical information

3-11
Transmit Architecture
If the AIC-6915 is programmed to transmit two words (8 bytes), the second word (bit 63-
32) is the InterruptStatus register content.
■
Typ e
-3 bit. Always 3’b101 for Transmit Complete Entry.
■
Transmit Status
- 13 bits. The bits are defined as
Bit 12: Transmit previously paused.
Bit 11: Pause control frame transmitted.
Bit 10: Control frame transmitted.
Bit 9: Transmit abort due to FIFO underrun.
Bit 8: Transmit abort due to long frame.
Bit 7: Transmit abort due to late collision.
Bit 6: Transmit abort due to excessive collision.
Bit 5: Transmit abort due to excessive deferral.
Bit 4: Transmit packet deferred.
Bit 3: Packet transmitted successfully.
Bit 2: Transmit field length out of range error.
Bit 1: Transmit field length check error.
Bit 0: Transmit CRC error.
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Pri
- 1 bit. Indicates a high- or low-priority queue.
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Index
- 15 bits. Descriptor Queue Consumer Index points to the beginning of a
packet in the Descriptor Queue. It is an 8-byte index, incremented by 1 every 8 bytes.
If the buffer/frame descriptor has a Skip field, the index points to the beginning of
the Skip field.
If the AIC-6915 is programmed to transmit two words (8 bytes), the second word (bit 63-
32) is the InterruptStatus register content.
❒
Table 3-8. Transmit Completion Queue Entry Type = Transmit Complete Entry
31 29 28 16 15 14 0
Type Transmit Status Pr
i
Index