PC7447AMGH1000LB datasheet(4/44 Pages) ATMEL

4 / 44 page

5387B–HIREL–07/05

PC7447A [Preliminary]

Eight-entry link register stack to predict the target address of Branch Conditional to

Link Register (BCLR) instructions

– Four integer units (IUs) that share 32 GPRs for integer operands

Three identical IUs (IU1a, IU1b, and IU1c) can execute all integer instructions except

multiply, divide, and move to/from special-purpose register instructions.

IU2 executes miscellaneous instructions including the CR logical operations, integer

multiplication and division instructions, and move to/from special-purpose register

instructions.

– Five-stage FPU and a 32-entry FPR file

Fully IEEE 754-1985-compliant FPU for both single- and double-precision

operations

Supports non-IEEE mode for time-critical operations

Hardware support for denormalized number

Thirty-two 64-bit FPRs for single- or double-precision operands

– Four vector units and 32-entry vector register file (VRs)

Vector permute unit (VPU)

Vector integer unit 1 (VIU1) handles short-latency AltiVec™ integer instructions,

such as vector add instructions (for example, vaddsbs, vaddshs, and vaddsws).

Vector integer unit 2 (VIU2) handles longer-latency AltiVec integer instructions, such

as vector multiply add instructions (for example, vmhaddshs, vmhraddshs, and

vmladduhm).

Vector floating-point unit (VFPU)

– Three-stage load/store unit (LSU)

Supports integer, floating-point, and vector instruction load/store traffic

Four-entry vector touch queue (VTQ) supports all four architectures of the AltiVec

data stream operations

Three-cycle GPR and AltiVec load latency (byte, half word, word, vector) with one-

cycle throughput

Four-cycle FPR load latency (single, double) with one-cycle throughput

No additional delay for misaligned access within double-word boundary

PC7447AMGH1000LB データシート(PDF) 4 Page - ATMEL Corporation