Altera 10-Gbps Ethernet MAC MegaCore Function - Manual (Page 146)

Chapter 9: Interface Signals 9–27
February 2014 Altera Corporation 10-Gbps Ethernet MAC MegaCore Function User Guide
9.0.9.4. Timing Diagrams—IEEE 1588v2 Timestamp
The following timing diagrams show the timestamp of frames observed on the TX
path for the IEEE 1588v2 feature.
Figure 9–9 shows the TX timestamp signals for the IEEE 1588v2 feature in a one step
operation.
Figure 9–9. Egress Timestamp Insert for IEEE 1588v2 PTP Packet Encapsulated in IEEE 802.3
Egress Timestamp Insert, IEEE 1588v2, PTP Packet
2-step Timestamp Request,Input
tx_egress_timestamp_request_valid
tx_egress_timestamp_request_data[N:0]
2-step Timestamp Return,Output
tx_egress_timestamp_96b_valid
tx_egress_timestamp_96b_fingerprint[N:0]
tx_egress_timestamp_96b_data[95:0]
tx_egress_timestamp_64b_valid
tx_egress_timestamp_64b_fingerprint[N:0]
tx_egress_timestamp_64b_data[63:0]
1-step Timestamp Insert,Input
tx_etstamp_ins_ctrl_timestamp_insert
tx_etstamp_ins_ctrl_timestamp_format
1-step Residence Time Update,Input
tx_etstamp_ins_ctrl_residence_time_update
tx_etstamp_ins_ctrl_ingress_timestamp_96b[95:0]
tx_etstamp_ins_ctrl_ingress_timestamp_64b[63:0]
tx_etstamp_ins_ctrl_residence_time_calc_format
1-step IPv4 and IPv6 Checksum,Input
tx_etstamp_ins_ctrl_checksum_zero
tx_etstamp_ins_ctrl_checksum_correct
1-step Location Offset,Input
tx_etstamp_ins_ctrl_offset_timestamp[15:0] Offset 1
Don’t-care
Don’t-care
Don’t-care
Don’t-care
Don’t-care
Don’t-care
Don’t-care
Don’t-care
Don’t-care
Don’t-care
tx_etstamp_ins_ctrl_offset_correction_field[15:0] Offset 2
tx_etstamp_ins_ctrl_offset_checksum_field[15:0]
tx_etstamp_ins_ctrl_offset_checksum_correction[15:0]