Re: [ARTIQ] clock recovery on Metlino and Kasli

2016-06-30 Thread Grzegorz Kasprowicz
Well, one can do this, there were discussion about replacing of VCXO with internall PLL (there is Xilinx note about it) But it requires additional work in gateware and it is not trivial to make it working reliably. Greg -Original Message- From: Sébastien Bourdeauducq [mailto:s...@m-labs.

Re: [ARTIQ] clock recovery on Metlino and Kasli

2016-06-30 Thread Slichter, Daniel H. (Fed)
> Since we are not going to use White Rabbit, I propose removing them. Do we have an alternate time/synchronization protocol planned for DRTIO? Does it make sense to leave WR components as a fallback for risk mitigation, in case we change our minds subsequently?

Re: [ARTIQ] clock recovery on Metlino and Kasli

2016-06-30 Thread Grzegorz Kasprowicz
OK On 30 June 2016 at 10:50, Sébastien Bourdeauducq wrote: > On Thursday, June 30, 2016 04:49 PM, Grzegorz Kasprowicz wrote: > >> In case of WR it already worked quite well 6 years ago but later on this >> circuit was modified several times:) >> All the time little things. >> So since we have mo

Re: [ARTIQ] clock recovery on Metlino and Kasli

2016-06-30 Thread Sébastien Bourdeauducq
On Thursday, June 30, 2016 04:49 PM, Grzegorz Kasprowicz wrote: In case of WR it already worked quite well 6 years ago but later on this circuit was modified several times:) All the time little things. So since we have more important things to do I'd leave it as it is. Since we are not going to

Re: [ARTIQ] clock recovery on Metlino and Kasli

2016-06-30 Thread Grzegorz Kasprowicz
Well, it is straightforward. But devil is in the details. In case of WR it already worked quite well 6 years ago but later on this circuit was modified several times:) All the time little things. So since we have more important things to do I'd leave it as it is. We can install both options on the

Re: [ARTIQ] clock recovery on Metlino and Kasli

2016-06-30 Thread Sébastien Bourdeauducq
On Thursday, June 30, 2016 04:38 PM, Grzegorz Kasprowicz wrote: But it requires additional work in gateware and it is not trivial to make it working reliably. What are the difficulties? Looking briefly at the White Rabbit DDMTD paper, it sounds pretty straightforward to me except that we may