AN2203 Freescale Semiconductor / Motorola, AN2203 Datasheet - Page 66

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

MPC7450 Execution Latencies
Table A-7 shows load and store instruction latencies. Load/store multiple and string instruction cycles are
represented as a fixed number of cycles plus a variable number of cycles, where n = the number of words
accessed by the instruction. Pipelined load/store instructions are shown with total latency and throughput
separated by a colon.
66
dcba
dcbf
dcbi
dcbst
dcbt
dcbtst
dcbz
dss
Mnemonic
Table A-6. Floating-Point Unit (FPU) Execution Latencies (continued)
MPC7450 RISC Microprocessor Family Software Optimization Guide
fnabs[.]
fneg[.]
fnmadds[.]
fnmadd[.]
fnmsubs[.]
fnmsub[.]
fres[.]
frsp[.]
frsqrte[.]
fsel[.]
fsubs[.]
fsub[.]
mcrfs
mffs[.]
mtfsb0[.]
mtfsb1[.]
mtfsfi[.]
mtfsf[.]
Mnemonic
Table A-7. Store Unit (LSU) Instruction Latencies
Freescale Semiconductor, Inc.
- NA -
- NA -
- NA -
- NA -
- NA -
- NA -
- NA -
- NA -
Class
For More Information On This Product,
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
Unit
- NA -
- NA -
MPC750
Unit
LSU
LSU
LSU
LSU
LSU
LSU
Go to: www.freescale.com
MPC750
Cycles
3 {e}
3 {e}
3:1
3:1
4:2
3:1
4:2
3:1
3:1
3:1
3:1
3:1
3:1
10
3
3
3
3
3:6(M=0)
Cycles
3:5 {e}
3:5 {e}
- NA -
- NA -
3:3
2:1
2:1
Unit
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
MPC7400
Unit
LSU
LSU
LSU
LSU
LSU
LSU
LSU
LSU
Cycles
3:1 {e}
MPC7400
3 {e}
3 {e}
3 {e}
3 {e}
3 {e}
3:1
3:1
3:1
3:1
3:1
3:1
3:1
3:1
3:1
3:1
3:1
10
2:3*b {s}
2:3*b {s}
2:3*b {s}
Cycles
2:3 {s}
2:3 {s}
2:1
2:1
2:1
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
FPU
Unit
MPC7450
Unit
LSU
LSU
LSU
LSU
LSU
LSU
LSU
LSU
Cycles
MPC7450
5{e}
5{e}
5{e}
5{e}
5{e}
5{e}
5:1
5:1
5:1
5:1
5:1
5:1
5:1
5:1
5:1
5:1
5:1
14
3:11 {s}
3:11 {s}
3:11 {s}
Cycles
3:1 {s}
3:1 {s}
3:1
3:1
3:1
MOTOROLA