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EXECUTE

• If one or more of the operands is not yet available, monitor the common data bus until a value with the appropriate tag appears.

• When both operands are available and the FU is free, execute the operation.

• This ensures RAW hazards are dealt with.

WRITE RESULT

• When the FU finishes, broadcast it on the common data bus, and from there in to the registers and any FU's waiting for this result.