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toolchain: Add IOB attribute#310

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occheung wants to merge 1 commit intom-labs:masterfrom
occheung:iob-attr
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toolchain: Add IOB attribute#310
occheung wants to merge 1 commit intom-labs:masterfrom
occheung:iob-attr

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This adds an IOB attribute for signals and instances.

In vivado, IOB attribute tells the synthesizer to place the register in the I/O block, if applicable.
See the necessary conditions to place the register in the I/O block.
https://adaptivesupport.amd.com/s/article/66668?language=en_US

@occheung occheung marked this pull request as ready for review May 22, 2025 01:57
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