MPC7457(2004) Ver la hoja de datos (PDF) - Freescale Semiconductor
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MPC7457 Datasheet PDF : 68 Pages
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Comparison with the MPC7455, MPC7445, MPC7450, MPC7451, and MPC7441
— Thermal management facility provides software-controllable thermal management. Thermal
management is performed through the use of three supervisor-level registers and an MPC7457-specific
thermal management exception.
— Instruction cache throttling provides control of instruction fetching to limit power consumption
• Performance monitor can be used to help debug system designs and improve software efficiency
• In-system testability and debugging features through JTAG boundary-scan capability
• Testability
— LSSD scan design
— IEEE 1149.1 JTAG interface
— Array built-in self test (ABIST)—factory test only
• Reliability and serviceability
— Parity checking on system bus and L3 cache bus
— Parity checking on the L2 and L3 cache tag arrays
3 Comparison with the MPC7455, MPC7445, MPC7450,
MPC7451, and MPC7441
Table 1 compares the key features of the MPC7457 with the key features of the earlier MPC7455, MPC7445,
MPC7450, MPC7451, and MPC7441. To achieve a higher frequency, the number of logic levels per cycle is
reduced. Also, to achieve this higher frequency, the pipeline of the MPC7457 is extended (compared to the
MPC7400), while maintaining the same level of performance as measured by the number of instructions executed
per cycle (IPC).
Table 1. Microarchitecture Comparison
Microarchitectural Specs
MPC7457/MPC7447
MPC7455/MPC7445
MPC7450/MPC7451/
MPC7441
Logic inversions per cycle
Pipeline stages up to execute
Total pipeline stages (minimum)
Pipeline maximum instruction throughput
Basic Pipeline Functions
18
5
7
3 + Branch
Pipeline Resources
18
5
7
3 + Branch
18
5
7
3 + Branch
Instruction buffer size
Completion buffer size
Renames (integer, float, vector)
SFX
Vector
Scalar floating-point
12
16
16, 16, 16
12
16
16, 16, 16
Maximum Execution Throughput
3
2 (any 2 of 4 units)
1
3
2 (any 2 of 4 units)
1
12
16
16, 16, 16
3
2 (any 2 of 4 units)
1
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
7
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