Key Elements - Reorder Buffer (ROB), ROB Map

0: 0 | F

1: 0 | F

2: 0 | F

ROBMap | V

Reorder Buffer will be managed as circular buffer. Head points to first free entry, tail points to oldest valid entry. ‘Dst’ is the Register File number for this destination value. Status can be Empty, Issued_Valid, Issued_Invalid, Finished_Valid, Finished_Invalid. ‘V bit in ROBmap indicates if entry is valid or not.

30: 0 | F

31: 0 | F

Reorder Buffer

| Status | Dst | Value

0 | Empty | 0 | 0

1 | Empty | 0 | 0

2 | Empty | 0 | 0

3 | Empty | 0 | 0

4 | Empty | 0 | 0

Head =>

<=Tail

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