Altera 10-Gbps Ethernet MAC MegaCore Function - Manual (Page 134)

Chapter 9: Interface Signals 9–15
February 2014 Altera Corporation 10-Gbps Ethernet MAC MegaCore Function User Guide
avalon_st_txstatus_error[] Output 7
When set to 1, each bit of this signal indicates an error
type in the receive frame.
■ Bit 0: Undersized frame.
■ Bit 1: Oversized frame.
■ Bit 2: Payload length error.
■ Bit 3: Unused.
■ Bit 4: Underflow.
■ Bit 5: Client error.
■ Bit 6: Unused.
The IP core presents the error status on this bus in the
same clock cycle it asserts
avalon_st_txstatus_valid
. The error status is invalid
when an underflow occurs or when CRC and/or padding
insertion is enabled.
avalon_st_tx_pfc_status_valid
(1)
Output 1
When asserted, this signal qualifies the data on the
avalon_st_tx_pfc_status_data
bus.
Table 9–8. Avalon-ST Status Interface Signals (Part 3 of 5)
Signal Direction Width Description