Forum Discussion

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

Cyclone V PLL desired output frequency

Hi! I have a problem using Altera PLL V 12.1 megafunction for Cyclone V. I choosed integer type of PLL and typed 20 MHz for Reference Clock Frequency. After that I choosed two output clock, ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

The feature abandoned in Cyclone V is "post-scale counter cascading". I guess, it has been removed in favour of other more essential features. Low frequency post-scalers can be easily implemented in logic fabric, in so far the cascading feature can replaced without problems. Of course it's annoying if your design needs rework because it used cascading.