Forum Discussion
New ContributorCyclone 10 LVDS SERDES Receiver refclk for multiple I/O banks
Dear All,
we are using Cyclone 10 (10CX105YF780E6G) and
we have to implement an LVDS Receiver for 33 rx_in channels with only one rx_inclk at a data rate of 900Mbps.
So, we need at least 2 I/O banks and 2 LVDS SERDES instances.
How can we use the same rx_inclk for several LVDS SERDES instances with their I/O PLLs?
Can we use the Global clock network for the reference clock to the I/O PLLs?
Best regards,
Bohris
6 Replies
AminT_IntelRegular Contributor
Hello Bohris,
May I know which version of Quartus are your team using for this design?
Thanks.
BohrisWe are using Quartus Prime Version 18.1.0 Build 222 09/21/2018 SJ Pro Edition.
- AminT_Intel
Hello,
I think 900 MHz desired inclock frequency is out of range.
Thanks.
- Bohris
The PLL inclock frequency of our design is 450MHz for a data rate of 900Mbps.
Reducing the LVDS Receiver SERDES to 8 rx_in channels with the PLL reference clock on the same bank as the data channels, the compilation is successful.
With more than 8 rx_in channels we want to use the PLL reference clock from another bank. Is this possible?- AminT_Intel
Hello Bohris,
I am sorry to tell you that that is not possible because IOs on each banks work independently. I hope you can work your design around this constraints.
Thanks.
- AminT_Intel
Hello Bohris,
You can try do that on Pin Assignment tab.
Thanks.
