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MCU Subsystem Functional Overview

June 2001 -- Revised December 2002

SPRS180C

MCU Subsystem Functional Overview

The 5471 MCU subsystem includes TI’s emulation-enhanced ARM7TDMI microcontroller core and several

peripherals including SPI and I2C interfaces, UARTs, timers, general-purpose input/output, and external

memory interface. The MCU subsystem provides 4K x 32 bits of general-purpose RAM and 4K x 32 bits of

Ethernet packet RAM. The following description of the 5471 MCU subsystem is based on Figure 4--1.

4.1

MCU Core

The MCU subsystem uses Texas Instruments’ emulation-enhanced ARM71TDMIE core, a derivative of the

ARM Limited ARM7TDMI core. The ARM7TDMI processor core is a member of the ARM7 Thumb™ family.

It is a low power 32-bit RISC processor incorporating the Thumb 16-bit compressed instruction set. This

microprocessor executes 32-bit or 16-bit instructions and on 32-, 16-, or 8-bit data. The excellent code density

achieved with Thumb leads to system cost reductions by reducing the required memory size and achieving

32-bit system performance from 16-bit wide memories.

4K × 32

Packet RAM

Interrupt

Handler

I2C

10/100

MAC

ARM7TDMIE

Memory I/F

DSPSS

I/F

Timer

Watchdog

SPI

Clock

Manager

PLL

4K × 32 RAM

UART

UART/IRDA

GPIO/Keypad

FLASH,

SDRAM,

etc.

Ethernet

PHY

I2C Device

Keypad

General-

Purpose

I/Os

SPI Device

IRDA

Transceiver

RS232

Transceiver

Clock

Oscillator

MCU Subsystem

DSP Subsystem

Figure 4--1. 5471 MCU Subsystem Functional Block Diagram

4.1.1 ARM7TDMI Emulation Features

The MCU subsystem’s ARM7TDMI core has been enhanced by TI with additional debugging features that

are available to emulation tools which understand TI’s ARM7TDMIE core. ARM7TDMI emulation tools which

are not specifically created with support for the ARM7TDMIE core’s emulation extensions are unable to take

advantage of these debugging features.

Thumb is a registered trademark of ARM Limited.

TNETV1002IDZHK 数据表(PDF) 39 Page - Texas Instruments

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