4

Am486DE2 Microprocessor

Table of Contents

Distinctive Characteristics ............................................................................................................................ 1

General Description...................................................................................................................................... 1

Block Diagram .............................................................................................................................................. 2

Ordering Information .................................................................................................................................... 3

Connection Diagrams and Pin Designations................................................................................................ 7

168-Pin Grid Array (PGA) Package ....................................................................................................... 7

168-Pin PGA Designations (Functional Grouping) ................................................................................ 8

208-Lead Shrink Quad Flat Pack (SQFP) Package............................................................................... 9

208-Lead SQFP Designations (Functional Grouping) ......................................................................... 10

Logic Symbol.............................................................................................................................................. 11

Pin Descriptions ......................................................................................................................................... 12

A20M.................................................................................................................................................... 12

A31–A2 ................................................................................................................................................ 12

ADS...................................................................................................................................................... 12

AHOLD (Modified)................................................................................................................................ 12

BE3–BE0 ............................................................................................................................................. 12

BLAST (Modified)................................................................................................................................. 12

BOFF ................................................................................................................................................... 12

BRDY ................................................................................................................................................... 12

BREQ................................................................................................................................................... 13

BS8/BS16 ............................................................................................................................................ 13

CACHE (New)...................................................................................................................................... 13

CLK (Modified) ..................................................................................................................................... 13

D31–D0................................................................................................................................................ 13

D/C....................................................................................................................................................... 13

DP3–DP0 ............................................................................................................................................. 13

EADS (Modified) .................................................................................................................................. 13

FERR ................................................................................................................................................... 14

FLUSH (Modified) ................................................................................................................................ 14

HITM (New).......................................................................................................................................... 14

HLDA ................................................................................................................................................... 14

HOLD ................................................................................................................................................... 14

IGNNE.................................................................................................................................................. 14

INTR..................................................................................................................................................... 14

INV (New) ............................................................................................................................................ 14

KEN...................................................................................................................................................... 14

LOCK ................................................................................................................................................... 14

M/IO ..................................................................................................................................................... 15

NMI ...................................................................................................................................................... 15

PCD ..................................................................................................................................................... 15

PCHK ................................................................................................................................................... 15

PLOCK (Modified)................................................................................................................................ 15

PWT ..................................................................................................................................................... 15

RDY ..................................................................................................................................................... 15

RESET ................................................................................................................................................. 15

SMI (New) ............................................................................................................................................ 15

SMIACT (New)..................................................................................................................................... 16

SRESET (New) .................................................................................................................................... 16

STPCLK (New) .................................................................................................................................... 16

TCK...................................................................................................................................................... 16

TDI ....................................................................................................................................................... 16

TDO ..................................................................................................................................................... 16

TMS ..................................................................................................................................................... 16

UP ........................................................................................................................................................ 16

VOLDET (New, 168-Pin PGA Package only) ...................................................................................... 16