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KAthu's avatar
KAthu
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6 years ago

Can I change weak pull up status of a FPGA pin during runtime?

Hi, I know that I can enable or disable weak pull ups in the project settings and create a bit stream. But is there a way to change the weak pull up of a pin based on some logic during runtime? Is ...
sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
6 years ago

What are you trying to accomplish by doing this?

Some IP, like the external memory interface IP, automatically enable or disable termination (on-chip termination) whether performing reads or writes and do the same to the ODT for the external memory.

#iwork4intel

KAthu's avatar
KAthu
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6 years ago

I am connecting the FPGA to an external micro-controller. And depending on the program I am running on the micro-controller, I need to enable weak pull ups on the fpga pins. (Using external pull ups is not an option for me.). My fpga design is the same for every program I run on the micro-controller. Using several muxes I implemented on the fpga, I can change the FPGA configuration for different programs during runtime.

Right now because of the pullups, I need to build several versions of the design. But if I can enable/disable pull ups using some IP during runtime, I can keep a single bitstream.