Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 351)

Pipeline Execution of Instruction Types
4-19 Pipeline SPRU733
Figure 4−13. Store Instruction Execution Block Diagram
Memory
E2
E3
Memory controller
Register file
E1
.D
Data
E2
Address
Functional
unit
When you perform a load and a store to the same memory location, these rules
apply (i = cycle):
- When a load is executed before a store, the old value is loaded and the
new value is stored.
i
LDW
i + 1 STW
- When a store is executed before a load, the new value is stored and the
new value is loaded.
i
STW
i + 1 LDW
- When the instructions are executed in parallel, the old value is loaded first
and then the new value is stored, but both occur in the same phase.
i
STW
i || LDW