Texas Instruments TMS320C67X/C67X+ DSP User Manual
Page 381
Functional Unit Constraints
4-49
Pipeline
SPRU733
Table 4−33 shows the instruction constraints for 4-cycle instructions executing
on the .L unit.
Table 4−33. 4-Cycle .L-Unit Instruction Constraints
Instruction Execution
Cycle
1
2
3
4
5
4-cycle
R
W
Instruction Type
Subsequent Same-Unit Instruction Executable
Single-cycle
n
n
Xw
n
4-cycle
n
n
n
n
INTDP
n
n
n
n
ADDDP/SUBDP
n
n
n
n
Instruction Type
Same Side, Different Unit, Both Using Cross Path Executable
Single-cycle
n
n
n
n
DP compare
n
n
n
n
2-cycle DP
n
n
n
n
4-cycle
n
n
n
n
Load
n
n
n
n
Store
n
n
n
n
Branch
n
n
n
n
16 × 16 multiply
n
n
n
n
MPYI
n
n
n
n
MPYID
n
n
n
n
MPYDP
n
n
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; Xw = Next instruction cannot enter E1 during cycle-write
constraint