Knowledge Base Article
What is the function of the snaptypesel bits within the Timestamp_control register in the HPS Ethernet MAC?
Description
The snaptypesel bits along with the tsmstrena and tsevntena bits control which PTP packets cause a snapshot to be taken as shown in the table.
| snapptypsel (bit [17:16]) | tsmstrena (bit 15) | tseventena (bit 14) | PTP Messages |
| 00 | X | 0 | SYNC, Follow_Up, Delay_Req, Delay_Resp |
| 00 | 0 | 1 | SYNC |
| 00 | 1 | 1 | Delay_Req |
| 01 | X | 0 | SYNC, Follow_Up, Delay_Req, Delay_Resp, Pdelay_Req, Pdelay_Resp, Pdelay_Resp_Follow_Up |
| 01 | 0 | 1 | SYNC, Pdelay_Req, Pdelay_Resp |
| 01 | 1 | 1 | Delay_Req, Pdelay_Req, Pdelay_Resp |
| 10 | X | X | SYNC, Delay_Req |
| 11 | X | X | Pdelay_Req, Pdelay_Resp |
Updated 3 months ago
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