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MariaSM



Joined: 03 May 2014
Posts: 41
MariaSM
How exactly I can make timing diagrams (Address, Data, WE, OE, WR, RD, M/IO/BHE etc) about some code of assembler? What's the order? For example, for this code :


Code:
MOV AX,0X
MOV [0X1234],AX    


OR THIS
Code:
MOV AX, [MEMORY_ADDRESS]
MOV AX,241    
Post 25 Aug 2014, 15:23
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shutdownall



Joined: 02 Apr 2010
Posts: 518
Location: Munich
shutdownall
For the older processors till 80386 (maybe even 80486) there is a fixed execution time per instruction. For the more modern Pentium and up the results are more or less unpredictable. This depends on the queue length, instruction units, cores, cache, the code itself and maybe a few things more.

I think the execution of instructions can be swapped internal either - but not sure if this is realized in hardware or only through software (compilers). But I assume, that this is optimized by the cpu itself as well. Wink
Post 26 Aug 2014, 22:26
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17476
Location: In your JS exploiting you and your system
revolution
In modern OoO architectures the internal instruction execution will have only a vague correlation with the external bus activity.

However for instructions like OUT and IN it may be possible to generate timing diagrams for the I/O bus that directly correlate to the internal instruction stream.
Post 26 Aug 2014, 22:35
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