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Can any tell me about simulation tool that cantain intel processors models(pentium II ,III,..etc) and CHIPSET models of intel as example (848,915...etc) and DDR rams ...etc in which i can simulate a complete motherboard
OR tell me how those company design it i don't ask about PCB design....what tools they use???
gee.... I also wanted to know what kinda of EDA are they using........
They don't simulate the chipset, processor etc.
They may have signal models, allowing them to simulate the individual traces on the motherboard, to verify signal integrity, delays etc.
The Pentium-class processors also have a lot of nice features for in-circuit debugging, when you have the finished hardware. You may use the supervision modes of the processor to single-step from the first BIOS instruction, all the way up through the WinXp (or Linux) boot sequence.
Simulating a processor is something the manufacturers of said processors do - and because of the great complexities, they most probably have custom-designed hw and sw for that job. They do not want to simulate on the instruction level, but simulate individual gates.
"tool that cantain intel processors models(pentium II ,III,..etc)"
If those are the processors you want, why on earth did you select "8051" as your choice of MCU (Architecture)?!
Keil don't make any tools for that sort of thing or for those processors - so this is the wrong forum for you!
See: http://www.keil.com/forum/