Don,
[quote user="Don Lydon"]Do I need to use a specific Ethernet Interface (RGMII, G/MII, RMII) on the AM3874 to support IEEE1588, 802.3?[/quote]
This is the feedback from our AVB expert:
Our MAC ports have hardware support for IEEE1588 (of which the AVB 802.1AS is a subset) and also hardware support for queue management (Rx/Tx) and traffic shaping(Tx-only). In my opinion, the first is probably required for an AVB system, the second is helpful, but not necessarily required. For the rest, it’s all software protocols. There isn’t any requirement to use any particular interface, though on DM814x/AM387x, there is some clocking restrictions when using RGMII because the CPTS clock will be from the same source as the RGMII clock. This means you can’t adjust the CPTS clock for syntonizing to the grand master without potentially causing the 125MHz RGMII clock to go out of spec.
Regards,
Pavel