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Scoreboard (Basic
Scheme (Ordering (In-order Issue, Out-of-order…
Scoreboard
Basic
Scheme
ID Stage
division
Issue
- Decode instruction
- Check for:
- structural hazard (FU occupied)
- WAW (destination reg occupied)
Read Operands
Waits until no data hazards,
then reads operands
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Hazard
Avoidance
Instructions dispatched in-order to FUs
Stall on structural hazards
Only one pending write per register (WAW)
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Structure
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FU
Status
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Infos
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Op: Operation performing (+, - , ..)
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Fj, Fk: source registers number
Qj, Qk: FUs producing src regs
Rj, Rk: Flags indicating when Fj, Fk
are ready to be read (by others)
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