MPC750ECSLASHD datasheet(4/44 Pages) NXP

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MPC750A RISC Microprocessor Hardware Speciﬁcations

Features

1.2 Features

This section summarizes features of the MPC750’s implementation of the PowerPC architecture. Major

features of the MPC750 are as follows:

•

Branch processing unit

— Four instructions fetched per clock

— One branch processed per cycle (plus resolving 2 speculations)

— Up to 1 speculative stream in execution, 1 additional speculative stream in fetch

— 512-entry branch history table (BHT) for dynamic prediction

— 64-entry, 4-way set associative branch target instruction cache (BTIC) for eliminating branch

delay slots

•

Dispatch unit

— Full hardware detection of dependencies (resolved in the execution units)

— Dispatch two instructions to six independent units (system, branch, load/store, ﬁxed-point unit

1, ﬁxed-point unit 2, or ﬂoating-point)

— Serialization control (predispatch, postdispatch, execution serialization)

•

Decode

— Register ﬁle access

— Forwarding control

— Partial instruction decode

•

Load/store unit

— One cycle load or store cache access (byte, half-word, word, double-word)

— Effective address generation

— Hits under misses (one outstanding miss)

— Single-cycle misaligned access within double word boundary

— Alignment, zero padding, sign extend for integer register ﬁle

— Floating-point internal format conversion (alignment, normalization)

— Sequencing for load/store multiples and string operations

— Store gathering

— Cache and TLB instructions

— Big- and little-endian byte addressing supported

— Misaligned little-endian support in hardware

•

Fixed-point units

— Fixed-point unit 1 (FXU1)—multiply, divide, shift, rotate, arithmetic, logical

— Fixed-point unit 2 (FXU2)—shift, rotate, arithmetic, logical

— Single-cycle arithmetic, shift, rotate, logical

— Multiply and divide support (multi-cycle)

— Early out multiply

•

Floating-point unit

— Support for IEEE-754 standard single- and double-precision ﬂoating-point arithmetic

— 3 cycle latency, 1 cycle throughput, single-precision multiply-add

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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