Compatible Systems RISC 2800i Manual de usuario descargar pdf (Pagina 7)

MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5

Freescale Semiconductor 7

Comparison with the MPC7447, MPC7445, and MPC7441

— IEEE 1149.1 JTAG interface

— Array built-in self test (ABIST)—factory test only

• Reliability and serviceability

— Parity checking on system bus

— Parity checking on the L1 and L2 caches

3 Comparison with the MPC7447, MPC7445, and

MPC7441

Table 1 compares the key features of the MPC7447A with the key features of the earlier MPC7447,

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

architecturally. The MPC7447A is identical to the MPC7447 but includes the DFS and temperature diode

features.

Table 1. Microarchitecture Comparison

Microarchitectural Specs 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

1 2 3 4 5 6 7 8 9 10 11 12 ... 55 56

Sin comentarios

Compatible Systems RISC 2800i Manual de usuario Pagina 7