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AM486DE2-66V8TGC Scheda tecnica(PDF) 5 Page - Advanced Micro Devices |
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AM486DE2-66V8TGC Scheda tecnica(HTML) 5 Page - Advanced Micro Devices |
5 / 52 page Am486DE2 Microprocessor 5 WB/WT (New) ...................................................................................................................................... 16 W/R ...................................................................................................................................................... 16 Functional Description................................................................................................................................ 17 Overview .............................................................................................................................................. 17 Memory ................................................................................................................................................ 17 Modes of Operation ............................................................................................................................. 17 Write-Through Cache Architecture ...................................................................................................... 17 Cache Replacement Description ......................................................................................................... 17 Memory Configuration ......................................................................................................................... 17 Clock Control.............................................................................................................................................. 18 Clock Generation ................................................................................................................................. 18 Stop Clock ........................................................................................................................................... 18 Stop Grant Bus Cycle .......................................................................................................................... 19 Pin State During Stop Grant ................................................................................................................ 19 Clock Control State Diagram ............................................................................................................... 20 SRESET Function ...................................................................................................................................... 20 System Management Mode ....................................................................................................................... 22 Overview .............................................................................................................................................. 22 Terminology ......................................................................................................................................... 22 System Management Interrupt Processing.......................................................................................... 22 Entering System Management Mode .................................................................................................. 26 Exiting System Management Mode ..................................................................................................... 27 Processor Environment ....................................................................................................................... 27 Executing System Management Mode Handler .................................................................................. 28 SMM System Design Considerations .................................................................................................. 31 SMM Software Considerations ............................................................................................................ 34 Test Registers 4 and 5 Modifications ......................................................................................................... 36 TR4 Definition ...................................................................................................................................... 36 TR5 Definition ...................................................................................................................................... 36 Am486DE2 Microprocessor Functional Differences................................................................................... 37 Am486DE2 Microprocessor Identification .................................................................................................. 37 DX Register at RESET ........................................................................................................................ 37 CPUID Instruction ................................................................................................................................ 37 Electrical Data ............................................................................................................................................ 39 Power Connections.............................................................................................................................. 39 Power Decoupling Recommendations................................................................................................. 39 Other Connection Recommendations.................................................................................................. 39 Absolute Maximum Ratings........................................................................................................................ 40 Operating Ranges ...................................................................................................................................... 40 DC Characteristics over Commercial Operating Ranges ........................................................................... 40 Switching Characteristics over Commercial Operating Ranges................................................................. 41 Switching Characteristics for 33-MHz Bus (66-MHz Microprocessor) ................................................. 42 Switching Waveforms .......................................................................................................................... 43 Package Thermal Specifications ................................................................................................................ 48 Physical Dimensions .................................................................................................................................. 50 168-Pin PGA ........................................................................................................................................ 50 208-Lead SQFP ................................................................................................................................... 51 |
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