Unused pin on STM32F767

[HMSEdinburge]

Hello.. i m designing a board using STM32F767, could anyone advise what should be done to those unused pins? Ground it or set it to ERC on Altium? 

[STTwo-32]

Hello @HMSEdinburge 

For the unused GPIO, they should not be left free. I/Os should be set to “0” or “1”(pull-up or pull-down to the unused I/O pins.). AN4661 can give you more details about the design rules for HWs based on the STM32F7.

Best Regards.

STTwo-32

[HMSEdinburge]

thanks for the reply, what does "For the unused GPIO, they should not be left free" ? Ground it or ERC ?