Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

altpll component query

I am using a DE2-115 board with Cyclone IVE. When I design something in SOPC, I just use one external clock input of 50 MHz, and then I use the altpll component in Quartus MegaWizard Plugin Manager t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

For the second paragraph, system.h file only tell you that your cpu should work at 50MHz, it only rely on your settings in SOPC Builder. If your cpu's input clock is not 50MHz, cpu can't working normally.

For the third paragraph, if you want your cpu working at 100MHz, just give it a 100MHz input clock, of course your cpu's clock settings should change to 100MHz in SOPC Builder.

I've never use the pll inside SOPC Builder, I hear from someone that it's not a good way.