Texas Instruments TMS320C3x - Manual (Page 264)

2-cycle store
The read of src2 cannot start
until the store is complete
2-cycle read of src1 and src2
Clocking Memory Accesses
8-28
Example 8–18. Operand Swapping Alternative
Switch the operands of the 3-operand instruction so that the internal read is
performed first.
STI R0,*AR6 ; AR6 points to MSTRB space
ADDI3 *AR3,*AR1,R0 ; AR3 points to on-chip RAM ( src 2)
; AR1 points to MSTRB space ( src 1)
H1
H3
Pipeline Operation
PC Fetch Decode Read Execute
n STI
n+1 ADDI3 STI
n+2 ADDI3 STI
n+3 — STI
n+4 — —
n+5 ADDI3 —
n+6 — —
n+7 — ADDI3
n+8 ADDI3