MPC7450EC datasheet(4/52 Pages) MOTOROLA

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MPC7450 RISC Microprocessor Hardware Speciﬁcations

MOTOROLA

Features

– Vector integer unit 1 (VIU1) handles short-latency AltiVec integer instructions, such as

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

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

vector multiply add instructions (vmhaddshs, vmhraddshs, and vmladduhm, for

example).

– 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 architected AltiVec data stream

operations

– Three-cycle GPR and AltiVec load latency (byte, half-word, word, vector) with 1-cycle

throughput

– Four-cycle FPR load latency (single, double) with 1-cycle throughput

– No additional delay for misaligned access within double-word boundary

– Dedicated adder calculates effective addresses (EAs)

– Supports store gathering

– Performs alignment, normalization, and precision conversion for ﬂoating-point data

– Executes cache control and TLB instructions

– Performs alignment, zero padding, and sign extension for integer data

– Supports hits under misses (multiple outstanding misses)

– Supports both big- and little-endian modes, including misaligned little-endian accesses

•

Three issue queues FIQ, VIQ, and GIQ can accept as many as one, two, and three instructions,

respectively, in a cycle. Instruction dispatch requires the following:

— Instructions can be dispatched only from the three lowest IQ entries—IQ0, IQ1, and IQ2.

— A maximum of three instructions can be dispatched to the issue queues per clock cycle.

— Space must be available in the CQ for an instruction to dispatch (this includes instructions that

are assigned a space in the CQ but not in an issue queue).

•

Rename buffers

— 16 GPR rename buffers

— 16 FPR rename buffers

— 16 VR rename buffers

•

Dispatch unit

— The decode/dispatch stage fully decodes each instruction.

•

Completion unit

— The completion unit retires an instruction from the 16-entry completion queue (CQ) when all

instructions ahead of it have been completed, the instruction has ﬁnished execution, and no

exceptions are pending.

— Guarantees sequential programming model (precise exception model)

— Monitors all dispatched instructions and retires them in order

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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MPC7450EC Datasheet(PDF) 4 Page - Motorola, Inc

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