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80486GX Datasheet

Embedded Ultra-Low Power Processor

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80486GX pdf
EMBEDDED ULTRA-LOW POWER Intel486GX PROCESSOR
s Ultra-Low Power Member of the Intel486™ s 16-Bit External Data Bus
Processor Family
— 32-Bit RISC Technology Core
— 8-Kbyte Write-Through Cache
— Four Internal Write Buffers
s 176-Lead Thin Quad Flat Pack (TQFP)
s Separate Voltage Supply for Core Circuitry
s Fast Core-Clock Restart
— Burst Bus Cycles
s Auto Clock Freeze
— Data Bus Parity Generation and
Checking
s Ideal for Embedded Battery-Operated and
Hand-Held Applications
— Intel System Management Mode (SMM)
— Boundary Scan (JTAG)
Barrel
Shifter
Register
File
ALU
Base/
Index
Bus
32
64-Bit Interunit Transfer Bus
32-Bit Data Bus
32
32-Bit Data Bus
32
Linear Address
32
Segmentation
Unit
Descriptor
Registers
Limit and
Attribute PLA
Paging
Unit
PCD
PWT
2
20
Translation
Lookaside
Buffer
Physical
Address
Cache Unit
8 Kbyte
Cache
Core
Clock
Clock
Control
CLK Input
Bus Interface
32 Address
Drivers
Write Buffers
32 4 x 32
Data Bus
32 Transceivers
A31-A2
BE3#- BE0#
D15-D0
Micro-
Instruction
Displacement Bus
32
128
Prefetcher
Control &
Protection
Test Unit
Instruction
Decode
Code
Stream
24
32-Byte Code
Queue
2x16 Bytes
Control
ROM
Decoded
Instruction
Path
Bus Control
Request
Sequencer
Burst Bus
Control
ADS# W/R# D/C# M/IO#
PCD PWT RDY# LOCK#
PLOCK# BOFF# A20M#
BREQ HOLD HLDA
RESET SRESET INTR
NMI SMI# SMIACT#
STPCLK#
BRDY# BLAST#
Parity
Generation
and Control
Cache
Control
Boundary
Scan
Control
DP1-DP0, PCHK#
KEN# FLUSH#
AHOLD EADS#
TCK TMS
TDI TD0
A5851-01
Figure 1. Embedded Ultra-Low Power Intel486™ GX Processor Block Diagram
© INTEL CORPORATION, 1997
December 1997
Order Number: 272755-002
Intel
Intel



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