--- In shane warne <>
wrote:
>
>
>
> pickanameanditstakensoihavethis <> wrote:
>
> each block addressed is a 256MB address space althugh only 64Mb is
accessable in each
>
>
> ---i think the total address space is 64Mbytes as we have 26
address pins 2^26=64Mega and not 256MB as u said and also any one of
them can be accessed at any paricular time.
>
internaly the cpu has a 32 bit address range , the upper 4 bits
are decoded as i had shown
to provide the outputs for the CEnX pins
but like i also said the space should be 256mb from the remaining
bits of the address but being only 26 bits available you can only
access a 64mb range in each
the other bits of the addressing in each block is ignored
but each CSnX pin relates to a seperate aria of memory that has the
full 26 bits (64mb) of the external address bus for its address
range
hope this is clear
Dave
its memory map is not as tidy this way , but its simple and easy to
impliment
> correct me if i am wrong.
>
> --Warney
>
>
>
>
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>
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