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Altera_Forum
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19 years ago

System not generating with 2 clock sources

Hi folks, I am having a problem when trying to use two PLL’s on my Cyclone II EP2C35in SOPC builder. I have one 100MHz PLL derived from a 50 MHz oscillator and another 10Mhz PLL derived from th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Having played about some more with SOPC builder I have noticed that if my counter module is running at a different frequency from the CPU then the system will not generate.

If I have my counter module and CPU running at 100Mhz, I can run the system ID peripheral, JTAG UART, RAM etc at 10MHz and the system generates correctly. If I try and run the counter at 10Mhz then the system will not generate.

Has anyone experienced similar problems?