參數(shù)資料
型號(hào)： 20736
英文描述： Enhanced Am486DX Family Data Sheet? 1.87MB (PDF)
中文描述： 增強(qiáng)Am486DX系列數(shù)據(jù)手冊(cè)？ 1.87MB（PDF格式）
文件頁(yè)數(shù)： 5/66頁(yè)
文件大?。?/td> 1923K
代理商： 20736
Enhanced Am486DX Microprocessor Family
5
P R E L I M I N A R Y
TABLE OF CONTENTS
Distinctive Characteristics......................................................................................................................................... 1
General Description .................................................................................................................................................. 1
Block Diagram........................................................................................................................................................... 2
Logic Symbol ........................................................................................................................................................... 3
Ordering Information................................................................................................................................................. 4
Connection Diagrams and Pin Designations ............................................................................................................ 8
168-Pin PGA (Pin Grid Array) Package ............................................................................................................. 8
168-Pin PGA Designations (Functional Grouping) ............................................................................................ 9
208-Pin SQFP (Shrink Quad Flat Pack) Package ........................................................................................... 10
208-Pin SQFP Designations (Functional Grouping) ........................................................................................ 11
Pin Description ....................................................................................................................................................... 12
Functional Description ........................................................................................................................................... 17
Overview .......................................................................................................................................................... 17
Memory ............................................................................................................................................................ 17
Modes of Operation ......................................................................................................................................... 17
Cache Architecture .......................................................................................................................................... 17
Write-Back Cache Protocol ............................................................................................................................. 18
Cache Replacement Description ..................................................................................................................... 19
Memory Configuration ..................................................................................................................................... 19
Cache Functionality in Write-Back Mode ......................................................................................................... 19
Cache Invalidation and Flushing in Write-Back Mode ..................................................................................... 31
Burst Write ....................................................................................................................................................... 32
Clock Control ......................................................................................................................................................... 34
Clock Generation ............................................................................................................................................. 34
Stop Clock ....................................................................................................................................................... 34
Stop Grant Bus Cycle ...................................................................................................................................... 35
Pin State During Stop Grant ............................................................................................................................ 35
Clock Control State Diagram ........................................................................................................................... 36
SRESET Function .................................................................................................................................................. 38
System Management Mode ................................................................................................................................... 38
Overview .......................................................................................................................................................... 38
Terminology ..................................................................................................................................................... 38
System Management Interrupt Processing ..................................................................................................... 39
Entering System Management Mode .............................................................................................................. 43
Exiting System Management Mode ................................................................................................................. 43
Processor Environment ................................................................................................................................... 43
Executing System Management Mode Handler .............................................................................................. 44
SMM System Design Considerations .............................................................................................................. 47
SMM Software Considerations ........................................................................................................................ 51
Test Registers 4 and 5 Modifications ..................................................................................................................... 51
TR4 Definition................................................................................................................................................... 52
TR5 Definition................................................................................................................................................... 53
Using TR4 and TR5 for Cache Testing ............................................................................................................ 53
Am486 Microprocessor Functional Differences ..................................................................................................... 54
Enhanced Am486DX CPU Identification ................................................................................................................ 55
DX Register at RESET .................................................................................................................................... 55
CPUID Instruction ............................................................................................................................................ 55
Electrical Data ........................................................................................................................................................ 56
Power and Grounding ...................................................................................................................................... 56
Absolute Maximum Ratings .................................................................................................................................... 57
Operating Ranges................................................................................................................................................... 57
DC Characteristics Over Commercial and Industrial Operating Ranges ................................................................ 57
Switching Characteristics Over Commercial and Industrial Operating Ranges...................................................... 58
AC Characteristics for Boundary Scan Test Signals at 25 MHz ............................................................................. 59
Switching Waveforms ............................................................................................................................................. 60
Package Thermal Specifications ............................................................................................................................ 64
Physical Dimensions .............................................................................................................................................. 65
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參數(shù)描述
207360-1 功能描述:管腳和插座連接器 3P PLUG HOUSING RoHS:否 制造商:Molex 系列:1561 產(chǎn)品類(lèi)型:Contacts 觸點(diǎn)類(lèi)型:Socket (Female) 節(jié)距: 位置/觸點(diǎn)數(shù)量: 排數(shù): 安裝風(fēng)格:Wire 端接類(lèi)型:Crimp 外殼材料: 觸點(diǎn)材料:Brass 觸點(diǎn)電鍍:Tin 電壓額定值: 電流額定值:
20-7360-10 功能描述:IC 與器件插座 ELEVATOR STRIP LINE 20 PINS RoHS:否 制造商:Molex 產(chǎn)品:LGA Sockets 節(jié)距:1.02 mm 排數(shù): 位置/觸點(diǎn)數(shù)量:2011 觸點(diǎn)電鍍:Gold 安裝風(fēng)格:SMD/SMT 端接類(lèi)型:Solder 插座/封裝類(lèi)型:LGA 2011 工作溫度范圍:- 40 C to + 100 C
207363-000 制造商:TE Connectivity 功能描述:MTC50-YH2-004
207365-1 功能描述:管腳和插座連接器 PIN HDR ASSY METRIMATE 3P RoHS:否 制造商:Molex 系列:1561 產(chǎn)品類(lèi)型:Contacts 觸點(diǎn)類(lèi)型:Socket (Female) 節(jié)距: 位置/觸點(diǎn)數(shù)量: 排數(shù): 安裝風(fēng)格:Wire 端接類(lèi)型:Crimp 外殼材料: 觸點(diǎn)材料:Brass 觸點(diǎn)電鍍:Tin 電壓額定值: 電流額定值:
207365-3 功能描述:管腳和插座連接器 PIN HEADER 3P RoHS:否 制造商:Molex 系列:1561 產(chǎn)品類(lèi)型:Contacts 觸點(diǎn)類(lèi)型:Socket (Female) 節(jié)距: 位置/觸點(diǎn)數(shù)量: 排數(shù): 安裝風(fēng)格:Wire 端接類(lèi)型:Crimp 外殼材料: 觸點(diǎn)材料:Brass 觸點(diǎn)電鍍:Tin 電壓額定值: 電流額定值:
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