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From: Paul Burke
Subject: Re: Philips XA architecture design
Date: Wed, 30 Oct 2002 12:51:41 +0000
Organization: Scazon Systems
References: <3DBD8B58.8020903@NO-SPAM.kortekaas.xs4all.nl> <5dCv9.2205$B72.firstname.lastname@example.org> <3DBFD2B9.email@example.com>
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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.
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.
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