Hi guys, I want to make some small modification on PLL of Cyclone V devices. However, it seems i can't do anything thru ECO on it as altera previous generation deivces (for example Cyclone III). Why?

The PLLs on the Cyclone V don't work the same as the earlier parts. Read the PLL chapter of the device handbook. Since you didn't give any details on what you were trying, I can't say why it doesn't work.

--- Quote Start --- The PLLs on the Cyclone V don't work the same as the earlier parts. Read the PLL chapter of the device handbook. Since you didn't give any details on what you were trying, I can't say why it doesn't work. --- Quote End --- I want to modify the PLL's output's phase after full compilation, so i used to use ECO to modify it. Which makes me implemented it fast whitout full complie my project again.

Hello, have you tried to follow http://electro-logic.blogspot.it/2015/09/fpga-engineering-change-orders.html (hello, have you tried to follow http://electro-logic.blogspot.it/2015/09/fpga-engineering-change-orders.html) ? I think it is done with Cyclone IV but should works also with Cyclone V. Are you using Cyclone V PLL IP? Tutorial is in Italian but you can translate it with Google or Bing.

Altera app note 661 "Implementing Fractional PLL Reconfiguration with Altera PLL and Altera PLL Reconfig IP Cores" seems to explain how to do this. Examples 2 and 4 are on phase shift. This is different from Cyclone IV.

--- Quote Start --- Hello, have you tried to follow http://electro-logic.blogspot.it/2015/09/fpga-engineering-change-orders.html (hello, have you tried to follow http://electro-logic.blogspot.it/2015/09/fpga-engineering-change-orders.html) ? I think it is done with Cyclone IV but should works also with Cyclone V. Are you using Cyclone V PLL IP? Tutorial is in Italian but you can translate it with Google or Bing. --- Quote End --- Hi Flz, I'm using CV PLL. I can't open your link.

Can't ECO modify PLL's properties of Cyclone V devices?

12 Replies

Altera_Forum
Honored Contributor
11 years ago
--- Quote Start ---
The PLLs on the Cyclone V don't work the same as the earlier parts. Read the PLL chapter of the device handbook. Since you didn't give any details on what you were trying, I can't say why it doesn't work.
--- Quote End ---

I want to modify the PLL's output's phase after full compilation, so i used to use ECO to modify it. Which makes me implemented it fast whitout full complie my project again.
Altera_Forum
Honored Contributor
11 years ago
The PLLs on the Cyclone V don't work the same as the earlier parts. Read the PLL chapter of the device handbook. Since you didn't give any details on what you were trying, I can't say why it doesn't work.

Forum Discussion

Can't ECO modify PLL's properties of Cyclone V devices?

12 Replies

Recent Discussions

CommunityGuart test

Can Agilex 3 A3CY100BM16AE7S (AXC3000) use SDM cryptographic services?

Quartus 25.1std | Signal Tap Crash

Build errors on helloworld tutorial

The Quartus Prime Lite Edition Installer 23.1