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MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4

Freescale Semiconductor 7

Comparison with the MPC7447A, MPC7447, MPC7445, and MPC7441

• Reliability and serviceability

— Parity checking on system bus

— Parity checking on the L1 caches and L2 data tags

— ECC or parity checking on L2 data

3 Comparison with the MPC7447A, MPC7447, MPC7445,

and MPC7441

Table 1 compares the key features of the MPC7448 with the key features of the earlier MPC7447A,

MPC7447, MPC7445, and MPC7441. All are based on the MPC7450 RISC microprocessor and are

architecturally very similar. The MPC7448 is identical to the MPC7447A, but the MPC7448 supports 1

Mbyte of L2 cache with ECC and the use of dynamic frequency switching (DFS) with more bus-to-core

ratios.

Table 1. Microarchitecture Comparison

Microarchitectural Specs MPC7448 MPC7447A MPC7447 MPC7445 MPC7441

Basic Pipeline Functions

Logic inversions per cycle 18

Pipeline stages up to execute 5

Total pipeline stages (minimum) 7

Pipeline maximum instruction throughput 3 + branch

Pipeline Resources

Instruction buffer size 12

Completion buffer size 16

Renames (integer, float, vector) 16, 16, 16

Maximum Execution Throughput

SFX 3

Vector 2 (any 2 of 4 units)

Scalar floating-point 1

Out-of-Order Window Size in Execution Queues

SFX integer units 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 8

Unresolved branches supported 3

Branch taken penalty (BTIC hit) 1

Minimum misprediction penalty 6

1 2 3 4 5 6 7 8 9 10 11 12 ... 59 60

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