2 .m-unit constraints – Texas Instruments TMS320C67X/C67X+ DSP User Manual
Page 372
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Functional Unit Constraints
Pipeline
4-40
SPRU733
4.3.2 .M-Unit Constraints
Table 4−24 shows the instruction constraints for 16 × 16 multiply instructions
executing on the .M unit.
Table 4−24. 16 y 16 Multiply .M-Unit Instruction Constraints
Instruction Execution
Cycle
1
2
3
16 × 16 multiply
R
W
Instruction Type
Subsequent Same-Unit Instruction Executable
16 × 16 multiply
n
n
4-cycle
n
n
MPYI
n
n
MPYID
n
n
MPYDP
n
n
Instruction Type
Same Side, Different Unit, Both Using Cross Path Executable
Single-cycle
n
n
Load
n
n
Store
n
n
DP compare
n
n
2-cycle DP
n
n
Branch
n
n
4-cycle
n
n
INTDP
n
n
ADDDP/SUBDP
n
n
Legend:
= E1 phase of the single-cycle instruction; R = Sources read for the instruction; W = Destinations written for the
instruction;
n
= Next instruction can enter E1 during cycle
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