Article ID: 000078811 Content Type: Troubleshooting Last Reviewed: 03/11/2015

What is the function of the snaptypesel bits within the Timestamp_control register in the HPS Ethernet MAC?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
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 11 Delay_Req
01 X0 SYNC, Follow_Up, Delay_Req, Delay_Resp, Pdelay_Req, Pdelay_Resp, Pdelay_Resp_Follow_Up
010 1 SYNC, Pdelay_Req, Pdelay_Resp
01 1 Delay_Req, Pdelay_Req, Pdelay_Resp
10 XSYNC, Delay_Req
11 XXPdelay_Req, Pdelay_Resp

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