Altera 10-Gbps Ethernet MAC MegaCore Function - Manual (Page 141)

9–22 Chapter 9: Interface Signals
10-Gbps Ethernet MAC MegaCore Function User Guide February 2014 Altera Corporation
tx_egress_timestamp_96b_valid Output 1
A transmit interface signal. Assert this signal to
indicate that a timestamp is obtained and a
timestamp request is valid for the particular
frame.
Assert this signal in the same clock cycle as the
start of packet
(avalon_st_tx_startofpacket is asserted).
tx_egress_timestamp_96b_fingerprint Output 1–16
Configurable width fingerprint that returns with
correlated timestamps.
The signal width is determined by the
TSTAMP_FP_WIDTH parameter.
tx_egress_timestamp_64b_data Output 64
A transmit interface signal. This signal requests
timestamp of frames on the TX path. The
timestamp is used to calculate the residence
time.
Consists of 48-bit nanoseconds field and 16-bit
fractional nanoseconds field.
tx_egress_timestamp_64b_valid Output 1
A transmit interface signal. Assert this signal to
indicate that a timestamp is obtained and a
timestamp request is valid for the particular
frame.
Assert this signal in the same clock cycle as the
start of packet
(avalon_st_tx_startofpacket or
avalon_st_tx_startofpacket_n
is
asserted).
tx_egress_timestamp_64b_fingerprint Output 1–16
Configurable width fingerprint that returns with
correlated timestamps.
The signal width is determined by the
TSTAMP_FP_WIDTH parameter.
Table 9–11. IEEE 1588v2 TX Egress Timestamp Interface Signals (Part 2 of 2)
Signal Direction Width Description