07-19-2018 10:09 AM
PG252 indicates that the reference clock for the VCU should come from an external source:
However, when I run Block Automation on a VCU that I've added, it creates (by default) a reference clock from a PS-generated clock:
It does this instead of creating an external port for the reference clock, as it does for the MIG's reference clock.
I also see that the VCU TRD (which I don't have) is intended to run on the ZCU106 board--but I can't find a suitable external clock reference on that board which the VCU might use.
So I'm getting mixed signals here, and I'm uncertain of the clock requirement for the VCU's Reference Clock.
-Joe G.
07-23-2018 08:54 AM - edited 07-23-2018 08:55 AM
07-23-2018 04:41 AM
Hello @jg_bds,
This is indeed strange.
What I can tell you, is that VCU TRD is using an external input clock (SYS_CLK):
set_property PACKAGE_PIN AH12 [get_ports SYSCLK_300_P]
set_property PACKAGE_PIN AJ12 [get_ports SYSCLK_300_N]
On the board, it is connected to a Si570 PLL. 300 MHz is it's default value.
That clock is running at 300Mhz and feed an internal PLL with 3 output clock.
The clk_out3 is the reference clock for the VCU and set to 33.333 MHZ.
Regards,
Sébastien.
07-23-2018 08:54 AM - edited 07-23-2018 08:55 AM
07-23-2018 02:02 PM
07-24-2018 01:19 AM
I'd try to run a simple implementation on the ZCU106 first in order to validate your idea.
-Sébastien.