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PRELIMINARY

Am29240

鈩?/span>

EH, Am29245

鈩?/span>

EH, and

Am29243

鈩?/span>

EH

Enhanced High-Performance RISC Microcontrollers

DISTINCTIVE CHARACTERISTICS

All three microcontrollers in the Am29240鈩H micro-

controller series have the following characteristics:

Completely integrated system for embedded

applications

Full 32-bit architecture

4-Kbyte, two-way set-associative instruction

cache

4-Gbyte virtual address space, 304-Mbyte

physical space implemented

Glueless system interfaces with on-chip wait

state control

36 VAX MIPS (million instructions per second)

sustained at 25 MHz

Four banks of ROM, each separately

programmable for 8-, 16-, or 32-bit interface

Four banks of DRAM

Single-cycle ROM burst-mode and DRAM

page-mode access

DRAM timing is software-programmable for 3/1

or 2/1 initial/burst access cycles

6-port peripheral interface adapter

16-line programmable I/O port

Bidirectional parallel port controller

Interrupt controller

Fully pipelined integer unit

Three-address instruction architecture

192 general purpose registers

Traceable Cache鈩?technology instruction and

data cache tracing

IEEE Std 1149.1-1990 (JTAG) compliant

Standard Test Access Port and

Boundary Scan Architecture

Binary compatibility with all 29K鈩?family

microprocessors and microcontrollers

CMOS technology/TTL compatible

208-pin Plastic Quad Flat Pack (PQFP) package

3.3-V power supply with 5-V-tolerant I/O

5/2/97

Am29240EH Microcontroller

The Am29240EH microcontroller has the following addi-

tional features:

2-Kbyte, two-way set-associative data cache

Single-cycle 32-bit multiplier for faster integer

math; two-cycle Multiply Accumulate (MAC)

function

16-entry on-chip Memory Management Unit

(MMU) with one Translation Look-Aside Buffer

4-channel double-buffered DMA controller with

queued reload

Two serial ports (UARTs)

Bidirectional bit serializer/deserializer

20- and 25-MHz operating frequencies

Am29243EH Microcontroller

The Am29243鈩H data microcontroller is similar to the

Am29240EH microcontroller, without the video inter-

face. It includes the following features:

2-Kbyte, two-way set-associative data cache

Single-cycle 32-bit multiplier for faster integer

math; two-cycle MAC

32-entry on-chip MMU with dual TLBs

4-channel, double-buffered DMA controller with

queued reload

Two serial ports (UARTs)

20- and 25-MHz operating frequencies

DRAM parity

Am29245EH Microcontroller

The low-cost Am29245鈩H microcontroller is similar to

the Am29240EH microcontroller, without the data cache

and 32-bit multiplier. It includes the following features:

16-entry on-chip MMU with one TLB

Two-channel DMA controller

One serial port (UART)

Bidirectional bit serializer/deserializer

16-MHz operating frequency

This document contains information on a product under development at Advanced Micro Devices, Inc. The information is intended

to help you evaluate this product. AMD廬 reserves the right to change or discontinue work on this proposed product without notice.

Publication #: 20068 Rev. A Amendment: /0

Issue Date: May 1997

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