External Ram on Z8?

Wondering if there is a way to add external ram to a Zilog Z8. It does
not appear that there is from looking the docs and pin-out, but i might
have missed something.

The integration of the Z8 is really nice to reduce parts count, but 4k
ram isnt going to cut it in my case.

ziggy wrote:
> Wondering if there is a way to add external ram to a Zilog Z8. It does
> not appear that there is from looking the docs and pin-out, but i might
> have missed something.
>
> The integration of the Z8 is really nice to reduce parts count, but 4k
> ram isnt going to cut it in my case.

This is the type of question that people who may know, hate to answer.

Zilog makes over 40 Z8 parts configurations.

This question can not be answered.

I could tell you to go to http://jfgi.us/ and you will find all you need.

Or I can tell you that you are a gmail poster and get a life.

Of I can ask you to be polite to me and give chip numbers or some kind
of information that can be answered.

So please, give us something to work with here or google it yourself.

donald

"ziggy" <> wrote in message
news:ziggy-...
> Wondering if there is a way to add external ram to a Zilog Z8. It does
> not appear that there is from looking the docs and pin-out, but i might
> have missed something.
>
> The integration of the Z8 is really nice to reduce parts count, but 4k
> ram isnt going to cut it in my case.

Depends on the part. "Z8" means it has a Z8 core, but doesn't help with
actually telling you if the part has an external bus. You will want to
check your datasheet. The Z8 core can support external memory with the LDE
opcodes.

-Travis

In article <> ,
Donald <> wrote:

> ziggy wrote:
> > Wondering if there is a way to add external ram to a Zilog Z8. It does
> > not appear that there is from looking the docs and pin-out, but i might
> > have missed something.
> >
> > The integration of the Z8 is really nice to reduce parts count, but 4k
> > ram isnt going to cut it in my case.
>
> This is the type of question that people who may know, hate to answer.
>
> Zilog makes over 40 Z8 parts configurations.
>
> This question can not be answered.
>
> I could tell you to go to http://jfgi.us/ and you will find all you need.
>
> Or I can tell you that you are a gmail poster and get a life.
>
> Of I can ask you to be polite to me and give chip numbers or some kind
> of information that can be answered.
>
> So please, give us something to work with here or google it yourself.
>
> donald

Well, considering that the parts i was looking at doesnt appear to
support them ( as i stated in my post ) any part suggestions in the Z8
family that would support external ram would have been nice and have
answered the question, as opposed to 'there are bla bla configurations,
get a life and google it'. With part suggestions i could have looked
the respective sheet on my own and checked for the other requirements i
have.

Would part numbers that i was looking the data sheets on have helped my
question? Sure, but was it really required due to the type of question i
was posing? No.

Ill just call a distributor Monday and get the info i need, I had
thought that people here might have been a little be more helpful and
offered a couple of suggestions. But i guess not, today anyway.


Oh, and i dont even have a gmail account to post with if i wanted too.

On Sat, 15 Jul 2006 13:34:47 -0400, ziggy <>
wrote:

>Wondering if there is a way to add external ram to a Zilog Z8. It does
>not appear that there is from looking the docs and pin-out, but i might
>have missed something.
>
>The integration of the Z8 is really nice to reduce parts count, but 4k
>ram isnt going to cut it in my case.

Practically any processor with a few general purpose input/output
ports and with some external latches can be used to connect gigabytes
of RAM for _data_ storage. The problem is that for typical DRAM
access, the multiplexed row/column address can be taken from some
output port bits, you then would have to generate the RAS/CAS signals
programmatically through to separate output port pins, thus the access
would be quite slow, but still well within the maximum times allowed
for DRAMs.

For the actual data transfer, when using external RAM with a common
I/O pin, just remember to program the controller port data direction
register as input for a read operation and as output for a memory
write operation.

These methods are usable, if you need a lot of RAM, but the transfer
rate is low.

Executing programs from such external memory would be much more
challenging :-)

Paul