Data Structure
To control the execution of the instructions, the scoreboard maintains three status tables:
- Instruction Status: Indicates, for each instruction being executed, which of the four stages it is in.
- Functional Unit Status: Indicates the state of each functional unit. Each function unit maintains 9 fields in the table:
- Busy: Indicates whether the unit is being used or not
- Op: Operation to perform in the unit (e.g. MUL, DIV or MOD)
- Fi: Destination register
- Fj,Fk: Source-register numbers
- Qj,Qk: Functional units that will produce the source registers Fj, Fk
- Rj,Rk: Flags that indicates when Fj, Fk are ready
- Register Status: Indicates, for each register, which function unit will write results into it.
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