Visible to Intel only — GUID: uou1613085540174
Ixiasoft
Visible to Intel only — GUID: uou1613085540174
Ixiasoft
7.14.2. TX 2-Step Timestamp Interface
The timestamp interface signals are valid when i_tx_valid and i_tx_startofpacket signals are high. To initiate a timestamp request, the i_ptp_ts_req signal must be high. You also must specify a fingerprint value in the i_ptp_fp signal. The fingerprint values are re-usable once the IP core returns a packet with the timestamp.
When the IP core returns the timestamp for a packet with a 2-step timestamp request, it asserts the o_ptp_ets_valid signal to indicate that the o_ptp_ets and o_ptp_ets_fp signals contain the timestamp information. The o_ptp_ets contains the timestamp and the o_ptp_ets_fp signal indicates the specific packet the timestamp is for. The IP processes the timestamp requests in the order they were received.
Signal Name |
Width | Description |
---|---|---|
i_ptp_ts_req i_ptp_ts_req[1:0] |
1 bit (10GE/25GE/50GE/100GE/200GE) 2 bits (400GE) |
Request a 2-step timestamp signal for the current TX packet when Ethernet rate is 10GE/25GE/50GE/100GE/200GE/400GE.
|
i_ptp_fp[w], where w represents timestamp fingerprint width i_ptp_fp[w*2], where w is 8-12 |
w bit (10GE/25GE/50GE/100GE/200GE) (w*2) bits (400GE) |
Fingerprint signal for current TX packet when Ethernet rate is 10GE/ 25GE/50GE/100GE/200GE/400GE. Assigns an 8 bit fingerprint to a TX packet that is being transmitted so the returned TX egress timestamp can be identified with respective TX packet.
Used for both 2-step and 1-step PTP packets. Intel recommends to use large range of fingerprints to avoid assigning same fingerprint to two currently processed TX packets. |
o_ptp_ets_valid o_ptp_ets_valid[1:0] |
1 bit (10GE/25GE/50GE/100GE/200GE) 2 bits (400GE) |
TX egress timestamp valid signal when Ethernet rate is 10GE/ 25GE/50GE/100GE/200GE/400GE. |
o_ptp_ets[95:0] o_ptp_ets[191:0] |
96 bits (10GE/25GE/50GE/100GE/200GE 192 bits (400GE) |
TX egress timestamp bus when Ethernet rate is 10GE/ 25GE/50GE/100GE/200GE/400GE.
The bus presents an egress timestamp for the TX packet transmitted with the fingerprint given by o_ptp_ets_fp signal.
The egress timestamp applies for 2-step and 1-step PTP packets. |
o_ptp_ets_fp[w] o_ptp_ets_fp[w*2], where w is 8-12 |
w bits (10GE/25GE/50GE/100GE/200GE) (w*2) bits (400GE) |
TX egress timestamp fingerprint when Ethernet rate is 10GE/25GE/ 50GE/100GE/200GE/400GE.
The bus presents the fingerprint for the current 2-step egress timestamp. You use the fingerprint to determine which TX packet the timestamp belongs to.
The egress timestamp applies for 2-step and 1-step PTP packets. |