Forum Discussion

KJian6's avatar
KJian6
Icon for New Contributor rankNew Contributor
7 years ago

How to remove the Unused_RX_Clock_Workaround_PMR_CDR_PLL which inserted by Quartus Prime fitter ?

Hi, I have a FPGA system which include both DDR4 IP and USB3 controller. The Quartus prime 18.1 build 222 has inserted lots of Unused_RX_Clock_Workaround_PMR_CDR_PLL during place&route: U...
KJian6's avatar
KJian6
Icon for New Contributor rankNew Contributor
7 years ago

Hi Nali1:

Many thanks for your help!

However, I have tried to add the command "set_global_assignment -name ENABLE_UNUSED_RX_CLOCK_WORKAROUND OFF" only in the QSF firstly.

It didn't work and those "Transmitter PLL" are still there.

For another command "set_instance_assignment -name ENABLE_UNUSED_RX_CLOCK_WORKAROUND OFF -to <pin name>",

I don't know which pin name should be assigned here ? How to find the related "Pin Name" from the output log file ?

Would you kindly give me some guide ?

Thanks again,

KJian6