Texas Instruments TMS320C67X/C67X+ DSP Car Speaker User Manual


 
Functional Unit Constraints
Pipeline4-36 SPRU733
Table 420 shows the instruction constraints for 2-cycle DP instructions exe-
cuting on the .S unit.
Table 420. 2-Cycle DP .S-Unit Instruction Constraints
Instruction Execution
Cycle 1 2 3
2-cycle RW W
Instruction Type
Subsequent Same-Unit Instruction Executable
Single-cycle Xw
DP compare 
2-cycle DP
Xw
ADDDP/SUBDP
ADDSP/SUBSP
Branch

Instruction Type
Same Side, Different Unit, Both Using Cross Path Executable
Single cycle
Load 
Store

INTDP

ADDDP/SUBDP

16 × 16 multiply

4-cycle

MPYI

MPYID

MPYDP
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