Modulo Iteration Interval Table For Iir (4-Cycle Loop) - Texas Instruments TMS320C6000 Programmer's Manual

6.7.6 Modulo Iteration Interval Scheduling
Table 6–17. Modulo Iteration Interval Table for IIR (4-Cycle Loop)
Unit/Cycle 0
.D1 LDH xi
.D2
.M1
.M2
.L1
.L2
.S1
.S2
1X
2X
Unit/Cycle 2
.D1
.D2
.M1
.M2
.L1
.L2
.S1
.S2
1X
2X
Note: The asterisks indicate the iteration of the loop.
Table 6–17 shows the modulo iteration interval table for the IIR filter. The SHR
instruction on cycle 10 finishes in time for the MPY p2 instruction from the next
iteration to read its result on cycle 11.
4 8, 12, 16, ...
* **
LDH xi LDH xi
ADD s0
6 10, 14, 18, ...
*
MPY p1 MPY p1
*
B LOOP
B LOOP
SHR yi+1
*
MPY p1 MPY p1
Optimizing Assembly Code via Linear Assembly
Unit/Cycle 1
.D1 LDH xi+1
.D2
.M1
.M2
.L1
.L2
.S1
.S2
1X
2X
Unit/Cycle 3
.D1
.D2
.M1
.M2
.L1
.L2
.S1
.S2
1X
2X
Loop Carry Paths
5 9, 13, 17, ...
* **
LDH xi+1 LDH ci+1
*
MPY p0
MPY p0
*
SUB cntr
SUB cntr
ADD s1
ADD s1
7 11, 15, 19, ...
STH yi+1
*
MPY p2 MPY p2
*
MPY p2 MPY p2
6-83