Compatible Systems RISC 2800i Instrukcja Użytkownika Pobierz pdf (Strona 8)

MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4

8 Freescale Semiconductor

Comparison with the MPC7447A, MPC7447, MPC7445, and MPC7441

Execution Unit Timings (Latency-Throughput)

Aligned load (integer, float, vector) 3-1, 4-1, 3-1

Misaligned load (integer, float, vector) 4-2, 5-2, 4-2

L1 miss, L2 hit latency with ECC (data/instruction) 12/16 —

L1 miss, L2 hit latency without ECC (data/instruction) 11/15 9/13

SFX (add, sub, shift, rot, cmp, logicals) 1-1

Integer multiply (32 × 8, 32 × 16, 32 × 32) 4-1, 4-1, 5-2

Scalar float 5-1

VSFX (vector simple) 1-1

VCFX (vector complex) 4-1

VFPU (vector float) 4-1

VPER (vector permute) 2-1

MMUs

TLBs (instruction and data) 128-entry, 2-way

Tablewalk mechanism Hardware + software

Instruction BATs/data BATs 8/8 8/8 8/8 8/8 4/4

L1 I Cache/D Cache Features

Size 32K/32K

Associativity 8-way

Locking granularity Way

Parity on I cache Word

Parity on D cache Byte

Number of D cache misses (load/store) 5/2 5/1

Data stream touch engines 4 streams

On-Chip Cache Features

Cache level L2

Size/associativity 1-Mbyte/

8-way

512-Kbyte/8-way 256-Kbyte/8-way

Access width 256 bits

Number of 32-byte sectors/line 2 2

Parity tag Byte Byte

Parity data Byte Byte

Data ECC 64-bit —

Thermal Control

Dynamic frequency switching divide-by-two mode Yes Yes No No No

Dynamic frequency switching divide-by-four mode Yes No No No No

Thermal diode Yes Yes No No No

Table 1. Microarchitecture Comparison (continued)

Microarchitectural Specs MPC7448 MPC7447A MPC7447 MPC7445 MPC7441

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 59 60

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