Functional Unit Constraints
4-41PipelineSPRU733
Table 4−25 shows the instruction constraints for 4-cycle instructions executing
on the .M unit.
Table 4−25. 4-Cycle .M-Unit Instruction Constraints
Instruction Execution
Cycle 1 2 3 4 5
4-cycle R W
Instruction Type
Subsequent Same-Unit Instruction Executable
16 × 16 multiply Xw
4-cycle
MPYI
MPYID
MPYDP
Instruction Type
Same Side, Different Unit, Both Using Cross Path Executable
Single-cycle
Load
Store
DP compare
2-cycle DP
Branch
4-cycle
INTDP
ADDDP/SUBDP
Legend: = E1 phase of the single-cycle instruction; R = Sources read for the instruction; W = Destinations written for the
instruction;
= Next instruction can enter E1 during cycle; Xw = Next instruction cannot enter E1 during cycle-write
constraint
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