On Tue, 21 Feb 2017 07:37:34 -0500, BC wrote: > >Some 1588 chip sets have (or had, I havent looked recently) external sync >pins. >This does get into the whole, whats a motherboard / whats a peripheral >debate. Plugging in a 1588 card to get that pin probably no longer counts >as a simple solution. If plugging in a card *does* count then that opens up >a lot of possible options. > >Bob
I found while looking at the datasheets for newer Intel server ethernet cards that they have the ability to timestamp GPIO pin transitions, but none of them have their internal timebase synchronized to a counter in the CPU. It looks like they are clocked from a separate XO on the card. Maybe if it was synchronized to the PCIe clock / BCLK they could take advantage of that new Always Running Timer in Skylake processors. I'm surprised that Intel hasn't made a big deal about it. Support for it was added in the Linux e1000e driver early last year. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
