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Table 6–15. ADDDP/SUBDP .L-Unit Instruction Hazards
Cycle
ADDDP/SUBDP
Instruction Type
Single-cycle
4-cycle
INTDP
ADDDP/SUBDP
Instruction Type
Single-cycle
DP compare
2-cycle DP
4-cycle
Load
Store
Branch
16
MPYI
MPYID
MPYDP
Legend:
Table 6–15 shows the instruction hazards for ADDDP/SUBDP instructions
executing on the .L unit.
1
R
Xr
Xr
Xrw
Xr
Same Side, Different Unit, Both Using Cross Path Executable
Xr
Xr
Xr
Xr
Xr
Xr
Xr
Xr
16 multiply
Xr
Xr
Xr
E1 phase of the single-cyle instruction
R
Sources read for the instruction
W
Destinations written for the instruction
Next instruction can enter E1 during cycle
Xr
Next instruction cannot enter E1 during cycle–read/decode hazard
Xw
Next instruction cannot enter E1 during cycle–write hazard
Xrw
Next instruction cannot enter E1 during cycle–read/decode/write hazard
Instruction Execution
2
3
4
5
R
Subsequent Same-Unit Instruction Executable
Xw
Xw
Xw
Xw
Functional Unit Hazards
6
7
8
W
W
Xw
Xw
TMS320C67x Pipeline
6-33
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