Hi Mike, In my application the time I get with MAC timestamping is good enough, but not the 1PPS signal. With two boards, one master and one slave connected back-to-back the max 1PPS jitter is approximately 200ns. The 1PPS on the slave side will be used to regenerate a higher frequency clock. My goal is to get down to 10-20ns 1PPS jitter. I am using a high stability external PTP clock reference for both master and slave. BR AD
> Sent: Monday, January 21, 2019 at 2:15 PM > From: "Lynch, Mike" <mike.ly...@hbm.com> > To: "Arthur Dent" <arthurd...@cyberdude.com> > Subject: RE: [Linuxptp-users] PHYs supporting HW timestamping > > Are you using an internal or external PTP reference clock? Is 150Mhz > accurate enough or do you need to account for the latency between the PHY and > the MAC? > > -----Original Message----- > From: Arthur Dent [mailto:arthurd...@cyberdude.com] > Sent: Monday, January 21, 2019 3:08 AM > To: linuxptp-users@lists.sourceforge.net > Subject: [Linuxptp-users] PHYs supporting HW timestamping > > Hi > On my Cyclone V SoC board I have ptp running with HW timestamping in MAC > (stmmac), but I need even better accuracy, i.e. hardware timestamping in PHY. > Is my only option to use TI’s DP83640 PHY (which only supports 100Mb) or am I > reading the information on > http://atpscan.global.hornetsecurity.com/index.php?atp_str=6oEZ_WXDKGAgauHn9VB73M-nT30yjx2ABcTlxmWMq6JKzSTQ7blQiVqL8avnNdU4IWMtn73mMShRf4sHOZqJ6G-pQlFVkhKaFMUjHFrGN09wLO54ty3kciK4oEzA0W-w1SsmHGzsH5Nca8_FAfL1Nx_SkGUUcbRWDpyrFhWgL6dCnPZd7_6L-eTBZq7UAQ6L_sRne2KmnqLsv_IyDHhODWoIF-8xU0sb9YHQJZYt2LeAeHV3Q8M4nCTf78tJhMxhlZBtFZoe5vvEWDJTz73IhqXgT97gaScEyTICQYC7IVBrXammN_QlBPIq2iM6OiM5MjZmM2JjMGMzYWMjOjojCy5R8n1LNQf7w6MmG4hPhA > 0incorrectly? > BR > AD > > > _______________________________________________ > Linuxptp-users mailing list > Linuxptp-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linuxptp-users > _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
