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Altera_Forum's avatar
Altera_Forum
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12 years ago

Some problem about CPLD EPM570

Hello, I have some problems about EPM570. What's the GCLK maximum value that could be accepted? I searched datasheet and found it can input higher than 100 MHz. But I input a 100 MHz XTAL and C...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Two silly questions to make sure first.

1. Could you measure 100MHz from input pin?

Maybe your scope cannot "see" that sample.

2. Is the 100MHz crystal works well?

Check voltage level related.