參數(shù)資料
型號: MPC7457EC
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: RISC Microprocessor Hardware Specifications
中文描述: RISC微處理器硬件規(guī)格
文件頁數(shù): 7/68頁
文件大?。?/td> 1755K
代理商: MPC7457EC
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
7
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
Basic Pipeline Functions
Logic inversions per cycle
18
18
18
Pipeline stages up to execute
5
5
5
Total pipeline stages (minimum)
7
7
7
Pipeline maximum instruction throughput
3 + Branch
3 + Branch
3 + Branch
Pipeline Resources
Instruction buffer size
12
12
12
Completion buffer size
16
16
16
Renames (integer, float, vector)
16, 16, 16
16, 16, 16
16, 16, 16
Maximum Execution Throughput
SFX
3
3
3
Vector
2 (any 2 of 4 units)
2 (any 2 of 4 units)
2 (any 2 of 4 units)
Scalar floating-point
1
1
1
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