Texas Instruments TMS320C67X/C67X+ DSP Car Speaker User Manual


 
Functional Unit Constraints
Pipeline4-46 SPRU733
Table 430 shows the instruction constraints for MPYSPDP instructions
executing on the .M unit.
Table 430. 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 cycleread/
decode constraint; Xw = Next instruction cannot enter E1 during cyclewrite constraint; Xu = Next instruction cannot
enter E1 during cycleother resource conflict