AN2203 Freescale Semiconductor / Motorola, AN2203 Datasheet - Page 6

• Manufacturer Part Number: AN2203
• Description: MPC7450 RISC Microprocessor Family Software Optimization Guide
• Manufacturer: Freescale Semiconductor / Motorola

Pipeline Differences
2.2
The MPC7450 instruction pipeline differs significantly from the MPC750 and MPC7400 pipelines.
Figure 2-1 shows the basic pipeline of the MPC750/MPC7400 processors.
Table 2-2 briefly explains the pipeline stages.
Figure 2-2 shows the basic pipeline of the MPC7450 processor, and Table 2-3 briefly explains the stages.
6
Fetch
Branch execution
Dispatch
Execute
Write back
Pipeline Stage
Pipeline Differences
MPC7450 RISC Microprocessor Family Software Optimization Guide
Figure 2-1. MPC750 and MPC7400 Pipeline Diagram
Abbreviation
E, E0, E1, ...
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Table 2-2. MPC750/MPC7400 Pipeline Stages
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WB
BE
F
D
Figure 2-2. MPC7450 Pipeline Diagram
Branch
Branch
BE
F1
F2
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BE
F
Read from instruction cache
Execute branch and redirect fetch if needed
Decode, dispatch to execution units, assigned to rename register,
register file read
Instruction execution and completion
Architectural update
IU1
WB
WB
F1
D
F2
F
D
E
IU1
E
C
I
LSU
WB
E0
E1
LSU
D
WB
F
F1
F2
E2
E0
E1
D
C
I
Comment
MOTOROLA