STM32MP157DAC1 datasheet(20/258 Pages) STMICROELECTRONICS

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Functional overview

STM32MP157A

20/258

DS12504 Rev 2

Functional overview

3.1

Dual-core Arm® Cortex®-A7 subsystem

3.1.1

Features

•

ARMv7-A architecture

•

32-Kbyte L1 instruction cache for each CPU

•

32-Kbyte L1 data cache for each CPU

•

256-Kbyte level2 cache

•

Arm® + Thumb®-2 instruction set

•

Arm® TrustZone® security technology

•

Arm® NEON™ Advanced SIMD

•

DSP and SIMD extensions

•

VFPv4 floating-point

•

Hardware virtualization support

•

Embedded trace module (ETM)

•

Integrated generic interrupt controller (GIC) with 256 shared peripheral interrupts

•

Integrated generic timer (CNT)

3.1.2

Overview

The Cortex-A7 processor is a very energy-efficient applications processor designed to

provide rich performance in high-end wearables, and other low-power embedded and

consumer applications. It provides up to 20 % more single thread performance than the

Cortex-A5 and provides similar performance than the Cortex-A9.

The Cortex-A7 incorporates all features of the high-performance Cortex-A15 and Cortex-

A17 processors, including virtualization support in hardware, NEON™, and 128-bit AMBA®4

AXI bus interface.

The Cortex-A7 processor builds on the energy-efficient 8-stage pipeline of the Cortex-A5

processor. It also benefits from an integrated L2 cache designed for low-power, with lower

transaction latencies and improved OS support for cache maintenance. On top of this, there

is improved branch prediction and improved memory system performance, with 64-bit load-

store path, 128-bit AMBA 4 AXI buses and increased TLB size (256 entry, up from 128 entry

for Cortex-A9 and Cortex-A5), increasing performance for large workloads such as web

browsing.

Thumb-2 technology

Delivers the peak performance of traditional Arm® code while also providing up to a 30 %

reduction in memory requirement for instructions storage.

TrustZone technology

Ensures reliable implementation of security applications ranging from digital rights

management to electronic payment. Broad support from technology and industry partners.

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