IDEA:

When a functional unit finishes an instruction, broadcast the result on a common data bus, to all the functional units, just in case this is what they're waiting for.

Q:

How does an FU know what it's waiting for?

A:

Each FU is fronted by a buffer, a ``reservation station'', containing the opcode it is supposed to perform, and the operands

• OR If the operand is not yet available, the reservation station holds a tag identifying the FU which will generate the operand.