On Thursday, June 23, 2016 09:43 PM, j arl wrote:
Ethernet is not required on the Sayma cards.
DRTIO is the first-choice for interfacing with Sayma cards. Supporting
Ethernet on Port 0 provides risk mitigation for DRTIO
It is unlikely that Ethernet would work but not the transceiver link,
unless there are gross PCB layout errors (missing transceiver clock,
wrong pinouts, etc.). Ethernet on the contrary requires more parts
(external PHY etc.) which are as many potential points of failure, and
the transceivers can be operated at low speeds with just a gateware
change in case there are signal integrity issues.
and an alternate interface for stand-alone operation of Sayma.
In this case, it should go to a RJ45 instead of pins on the uTCA
connector. Note that the gateware/software design for high performance
Sayma-over-Ethernet is not trivial nor currently planned.
And Ethernet does not have deterministic latency, so additional
synchronization signals would be required if timing is important.
For this stand-alone operation, low-speed buses such as SPI (à la PDQ3)
probably would be better anyway (I assume the other end of the link is a
FPGA).
Sébastien
_______________________________________________
ARTIQ mailing list
https://ssl.serverraum.org/lists/listinfo/artiq
