Hello All,
Does the Boards have an onboard static RAM ? If NOT then how can the processor make any CALL,PUSH or service INTERRUPTs ? Now a days i do not see any STATIC RAM chip on the boards.(Is it built into any kind of chipset) What is going on,i do not understand how a processor can work without STATIC RAM ?
And i assume that now boards have started using serial SPI FLASH chips for stuff instead of parallel one. Does it mean that processor has special circuitry inbuilt to read and execute in place (XIP) from serial FLASH chips.
Where to get complete standard specification for the boards,if i want to program the memory chip with my own OS.
That depends entirely on what specific board(s) you are talking about - but you seem to have omitted that essential detail!
"Now a days i do not see any STATIC RAM chip on the boards"
Again, that depends on what board(s) you are looking at!
Micro-controllers have some RAM on the chip; some also support adding external RAM.
" i assume that now boards have started using serial SPI FLASH chips for stuff instead of parallel one"
Why do you assume that?
"Where to get complete standard specification for the boards"
Ask the manufacturer(s) and/or supplier(s) of the particular board(s)
You will also need a sound understanding of the particular chips used on those boards - for which you will need to visit the website(s) of the manufacturer(s) and/or supplier(s) of the particular chip(s)