Altera 10-Gbps Ethernet MAC MegaCore Function - Manual (Page 164)

Appendix C: Packet Classifier C–3
February 2014 Altera Corporation 10-Gbps Ethernet MAC MegaCore Function User Guide
C.2.3. Ingress Control Signals
Table C–4 describes the ingress control signals for the Packet Classifier.
Table C–4. Ingress Control Signals for the Packet Classifier (Part 1 of 2)
Signal Direction Width Description
tx_etstamp_ins_ctrl_in_ingress_timest
amp_96b
Input 96
96-bit format of ingress timestamp that holds
data so that the output can align with the start
of an incoming packet.
tx_etstamp_ins_ctrl_in_ingress_timest
amp_64b
Input 64
64-bit format of ingress timestamp that holds
data so that the output can align with the start
of an incoming packet.
tx_etstamp_ins_ctrl_out_ingress_times
tamp_96b
Output 96
96-bit format of ingress timestamp that holds
data so that the output can align with the start
of an outgoing packet.
tx_etstamp_ins_ctrl_out_ingress_times
tamp_64b
Output 64
64-bit format of ingress timestamp that holds
data so that the output can align with the start
of an outgoing packet.
tx_egress_timestamp_request_in_valid Input 1
Assert this signal when timestamp is required
for the particular frame. This signal must be
aligned to the start of an incoming packet.
tx_egress_timestamp_request_in_finger
print
Input 4
A width-configurable fingerprint that correlates
timestamps for incoming packets.
tx_egress_timestamp_request_out_valid Output 1
Assert this signal when timestamp is required
for the particular frame. This signal must be
aligned to the start of an outgoing packet.
tx_egress_timestamp_request_out_finge
rprint
Output 4
A width-configurable fingerprint that correlates
timestamps for outgoing packets.
clock mode Input 2
Determines the clock mode.
00: Ordinary clock
01: Boundary clock
10: End to end transparent clock
11: Peer to peer transparent clock
pkt_with_crc Input 1
Indicates whether or not a packet contains CRC.
1: Packet contains CRC
0: Packet does not contain CRC
tx_etstamp_ins_ctrl_in_residence_time
_update
Input 1
Indicates the update for residence time.
1: Allows update for residence time based on
decoded results.
0: Prevents update for residence time. When
this signal is deasserted,
tx_etstamp_ins_ctrl_out_residence_ti
me_update also gets deasserted.