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Date: Wed, 30 Oct 2002 15:26:10 +0100
From: Tim Kortekaas
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Subject: Re: Philips XA architecture design
References: <3DBD8B58.8020903@NO-SPAM.kortekaas.xs4all.nl> <5dCv9.2205$B72.email@example.com> <3DBFD2B9.firstname.lastname@example.org> <3DBFD5DD.D76FB24D@scazon.com>
Paul Burke wrote:
> Tim Kortekaas wrote:
>>IDEA: I don't need such a big ROM (of 1 megabit). Can I just program the
>> code above in 2 8bit EPROMs of 8kb. If I connect A1 to A12 of the XA
>>to A1-A12 of the 2 EPROMS. A0 of the first ROM to ground and A0 of the
>>second ROM to Vcc. Then D0-D7 of the first ROM to D0-D7 of the XA and
>>D0-D7 of the second ROM to D8-D15 of the XA. Will this work?
>>I guess I can't program the above code in a 16bit ROM without
>>preprocessing the HEX file to adjust it to fit in a 16bit ROM...
> Yes, looks OK. But why are you using external ROM at all? The XAG49 has
> 64k bytes of easily programmed (serial port) internal Flash. Get hold of
> the free Raisonance compiler, and you can have programs up to 32k of
> that. And you get to use all your IO ports.
Hmm. Looks like a nice alternative. I guess this is an easier one to
begin with. The reason why I want to use the XA-S3 is because of is
24bit addressbus. This way there's always the possibility to add vast
amounts of memory. Always a nice feature for a dev board.
> I can imagine wanting to use more than the internal 2K of RAM, but
> that's another matter, as you don't have to program it.
That's for sure. Ram is easily added (like the 2 8bit ROMs method I
32kb for programmemory looks anough for a while. I am not a big XA
programmer right now. Never programmed 1 byte of XA asm, actually. But I
don't want to bump against the memory limit in the future.
But the XA-G46 sure is an option I have to remember.
> Paul Burke
To reach me by email, remove the obvious...
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