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
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
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
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.
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
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