Forum Discussion
ContributorCyclone 10 Gx FPLL Settings
Hi,
I am looking for Cyclone 10GX FPLL data about the values for loop filter resistance, charge pump current...
My main application is using Nios II to dynamically change the values but I am not able to find any information related to this usage.
For example, AN-728 provides data about the loop filter, charge pump..
Similar constraint should exist for FPLL..
Please help!
Thank you!
BRs,
Johnson
3 Replies
JonWay_alteraFrequent Contributor
You can find fpll register map in: https://www.altera.com/content/dam/altera-www/global/en_US/others/literature/hb/cyclone-10/c10-registermap-official.xlsx
References: fpll is mostly for transceiver usage. For core usage, there is a how-to video that you can refer.
JLee25Hi JonWay,
Thank you for the shared data.
What I am trying to know is how to find proper fPLL settings for,
" loop filter resistance, charge pump current..".
I am not able to fine the guidelines like "AN-728".
As my design needs to manually adjust the M values dynamically.
BRs,
Johnson
- JonWay_altera
Hi,
The excel sheet has the info of the loop filter resistance and charge pump as well.
Just like IOPLL, these values are auto calculated.I would suggest that you follow the Youtube how-to to generate the mif, and then compare what are the changes in the loop filter/charge pump.
