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Functional Unit Constraints
Pipeline4-46 SPRU733
Table 4−30 shows the instruction constraints for MPYSPDP instructions
executing on the .M unit.
Table 4−30. MPYSPDP .M-Unit Instruction Constraints
Instruction Execution
Cycle 1 2 3 4 5 6 7
MPYSPDP R R W W
Instruction Type
Subsequent Same-Unit Instruction Executable
16 × 16 multiply Xr Xw Xw
MPYDP
Xr Xu Xu
MPYI
Xr Xu Xu
MPYID
Xr Xu Xu
MPYSP
Xr Xw Xw
MPYSPDP
Xr Xu
MPYSP2DP
Xr Xw Xw
Instruction Type
Same Side, Different Unit, Both Using Cross Path Executable
Single-cycle Xr
Load Xr
Store
Xr
DP compare
Xr
2-cycle DP
Xr
Branch
Xr
4-cycle
Xr
INTDP
Xr
ADDDP/SUBDP
Xr
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; Xr = Next instruction cannot enter E1 during cycle−read/
decode constraint; Xw = Next instruction cannot enter E1 during cycle−write constraint; Xu = Next instruction cannot
enter E1 during cycle−other resource conflict