Updated Alveo U250 Constraints for Timing Issue

[aaqdas]

Description

📝 Resolves the timing violation in synthesis for Alveo U250. The pin constraints for the reference clock gt0_refclk_p showed that reference clock is directly connected to a 156.25 MHz Clock. However, the clock is constrained to 322MHz in Timing Constraints.

Type of change

• Bug fix
• New feature
• Documentation update
• A new research paper code implementation
• Other

Tests & Results

📝 Static Bitstream Generated and Linked with rdma_perf example shell. Timing report verified shows no violation. I can share the timing report separately if required for verification by maintainers

Checklist

• I have commented my code and made corresponding changes to the documentation.
• I have added tests/results that prove my fix is effective or that my feature works.
• My changes generate no new warnings or errors & all tests successfully pass.

[bo3z]

Thanks @aaqdas for this. The change looks good to me; we will try to merge in the near future after we have done some more tests with the u250. We are currently focusing on some improvement functionality on the u280 / u55c.