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Altera_Forum's avatar
Altera_Forum
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15 years ago

Measuring Frequency help

I need to measuring a signal frequency i have a reference frequency of 100 MHz i used the following code bu it didn't work properly it counter right at the first but after that it got wrong:...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

how fast is clk? the fact you are samplining a 100MHz counter in another clock domain and vice versa is probably your problem. You will need to transfer the counters across the clock domains safely, either with a double register or a dual clock fifo.