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Altera_Forum
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12 years ago

Cyclone V fitter cannot place fractional PLL

Hi All! Right now I'm trying to compile the simple design to check if pin assignment is correct before I start to route the PCB. In our project we use 8 ADCs (output interface of each ADC is 9x...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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Have you tried to cascade two fPLL?. Set the output of the first one as the input of the second one, which should be the transceiver's PLL. I found the same problem using the cycloneV development board and I overcome the problem doing that.

Luck.

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Can you tell me how to deal with it using transceiver's pll? How to cascade two fpll?