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Pipeline Execution of Instruction Types
Pipeline4-30 SPRU733
4.2.12 MPYID Instruction
The MPYID instruction uses the E1 through E10 phases of the pipeline to
complete its operations (see Table 4−14). The sources are read on cycles E1
through E4, the lower 32 bits of the result are written on E9, and the upper
32 bits of the result are written on E10. The MPYID instruction is executed on
the .M unit. The functional unit latency for the MPYID instruction is 4.
Figure 4−24 shows the fetch, decode, and execute phases of the pipeline that
the MPYID instruction uses.
Table 4−14. MPYID Instruction Execution
Pipeline Stage
E1 E2 E3 E4 E5 E6 E7 E8 E9 E10
Read src1
src2
src1
src2
src1
src2
src1
src2
Written dst_l dst_h
Unit in use
.M .M .M .M
Figure 4−24. MPYID Instruction Phases
PG PS PW PR DP DC E1 E2 E3 E4 E5 E6 E7 E8 E9 E10
9 delay slots