review IOB flip-flop use

m-labs / artiq

A leading-edge control system for quantum information experiments

https://m-labs.hk/artiq

GNU Lesser General Public License v3.0

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review IOB flip-flop use #1384

Open sbourdeauducq opened 5 years ago

sbourdeauducq commented 5 years ago

as per discussion in https://github.com/m-labs/artiq/pull/1382

jordens commented 4 years ago

Vivado complains about the IOB=TRUE usage:

CRITICAL WARNING: [Place 30-722] Terminal 'urukul5_dds_reset_sync_in_n' has IOB constraint set to TRUE, but it is either not connected to a FLOP element or the connected FLOP element could not be brought into the I/O