COMMERCIAL TEMPERATURE RANGE

MARCH 1996

©1996 Integrated Device Technology, Inc.

DSC-2905/5

IDT79R3041

™

LOW-COST SYSTEMS

IDT79R3041

IDT79RV3041

FEATURES:

• Instruction

set

compatible

with

IDT79R3000A

and RISController Family MIPS RISC CPUs

• High level of integration minimizes system cost

— RISC CPU

— Multiply/divide unit

— Instruction Cache

— Data Cache

— Programmable bus interface

— Programmable port width support

• On-chip instruction and data caches

— 2KB of Instruction Cache

— 512B of Data Cache

• Flexible bus interface allows simple, low-cost designs

— Superset pin-compatible with RISController

— Adds programmable port width interface

(8-, 16-, and 32-bit memory sub-regions)

— Adds programmable bus interface timing support

(Extended address hold, Bus turn around time,

Read/write masks)

• Double-frequency clock input

• 16.67MHz, 20MHz, 25MHz and 33MHz operation

• 20MIPS at 25MHz

• Low cost 84-pin PLCC packaging

• On-chip 4-deep write buffer eliminates memory write stalls

• On-chip 4-word read buffer supports burst or simple block

reads

• On-chip DMA arbiter

• On-chip 24-bit timer

• Boot from 8-bit, 16-bit, or 32-bit wide PROMs

• Pin- and software-compatible family includes R3041, R3051,

• Complete software support

— Optimizing compilers

— Real-time operating systems

— Monitors/debuggers

— Floating Point emulation software

— Page Description Languages

Figure 1. R3041 Block Diagram

Clock

Generator

Unit

Master Pipeline Control

System Control

Coprocessor

Integer

CPU Core

Exception/Control

Registers

Bus Interface

Registers

General Registers

(32 x 32)

ALU

Shifter

Mult/Div Unit

Address Adder

PC Control

Virtual Address

Data

Cache

512B

Instruction

Cache

2kB

Physical Address Bus

BIU

Control

DMA

Arbiter

4-deep

Read

Buffer

4-deep

Write

Buffer

ClkIn

Int(5:3), SInt(2:0)

32

32

SBrCond(3:2)

Data Bus

Address/

Data

DMA

Ctrl

Rd/Wr

Ctrl

SysClk

PortSize

Register

Counter

Registers

TC

R3051 Superset

Bus Interface Unit

Data

Unpack

Unit

Data

Pack

Unit

Timing/ Interface

Control

2905 drw 01

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Integrated Device Technology, Inc.

RISController, R3041, R3051, R3052, R3081, ORION, IDT/sim, and IDT/kit are trademarks, and the IDT logo is a registered trademark of Integrated Device Technology, Inc.