STRUCTURAL HAZARDS

• The reservation stations form a buffer, allowing an instruction to be issued to the RS even if the FU is busy.
• The instruction will be stalled in the RS until the FU is free
• If another instruction needs the FU, it will stall in the issue stage until the RS is free. This may cause delay in issuing other instructions
• The CDB limits the machine to one completion per clock. If several instructions complete in the same cycle a priority scheme is used to provide access to the CDB serially.

Q: Is it possible to deal with this by duplicating the CDB?