MPC7457 datasheet(9/71 Pages) FREESCALE

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Comparison with the MPC7455, MPC7445, MPC7450, MPC7451, and MPC7441

MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8

Freescale Semiconductor

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

Pipeline stages up to execute

Total pipeline stages (minimum)

Pipeline maximum instruction throughput

3 + Branch

Pipeline Resources

Instruction buffer size

Completion buffer size

Renames (integer, float, vector)

16, 16, 16

Maximum Execution Throughput

SFX

333

Vector

2 (any 2 of 4 units)

Scalar floating-point

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

Scalar floating-point unit

In order

Branch Processing Resources

Prediction structures

BTIC, BHT, link stack

BTIC size, associativity

128-entry, 4-way

BHT size

2K-entry

Link stack depth

Unresolved branches supported

Branch taken penalty (BTIC hit)

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