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Ideally, I want to set_output_delay only for paths from internal FFs to ulpi_dir, but it only supports targets, not sources? Yes, it's possible in SDC. You can use the set_max_delay and set_min_delay instead. For e.g, if I really understood your requirement on ulpi_data: set_max_delay -from [get_registers *] -to [get_ports ulpi_data] 8.200 Where \$8.200\$ ...

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