On 10/30/2014 11:25 PM, Slichter, Daniel H. wrote: >> Why not send the SYNC_CLK from each DDS through the backplane? > This would be the simplest thing to do, but we don't have enough > lines in the FMC connector for it right now. Since the exact timing > of the update is not necessarily critical for all DDS chips > (depending on what they are used for), it seems that for now the > simplest solution is just to let people plug the SYNC_CLKs into TTL > input individually if desired.
We can mux the clocks on the backplane (using a multiplexer chip with a stable combinatorial delay and little jitter). Measuring each of their phases one by one after a reset should be enough. The multiplexer control can be shared with the DDS selection. Sébastien _______________________________________________ ARTIQ mailing list https://ssl.serverraum.org/lists/listinfo/artiq
