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MC7457RX1267LC Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc

No. de pieza MC7457RX1267LC
Descripción Electrónicos  Microprocessor
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Fabricante Electrónico  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC7457RX1267LC Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc

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Comparison with the MPC7455, MPC7445, MPC7450, MPC7451, and MPC7441
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8
Freescale Semiconductor
9
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
333
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
Out-of-Order Window Size in Execution Queues
SFX integer units
1 entry
× 3 queues
1 entry
× 3 queues
1 entry
× 3 queues
Vector units
In order, 4 queues
In order, 4 queues
In order, 4 queues
Scalar floating-point unit
In order
In order
In order
Branch Processing Resources
Prediction structures
BTIC, BHT, link stack
BTIC, BHT, link stack
BTIC, BHT, link stack
BTIC size, associativity
128-entry, 4-way
128-entry, 4-way
128-entry, 4-way
BHT size
2K-entry
2K-entry
2K-entry
Link stack depth
8
8
8
Unresolved branches supported
3
3
3
Branch taken penalty (BTIC hit)
1
1
1


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