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From: "Frank Bemelman"
References: <3DBD8B58.8020903@NO-SPAM.kortekaas.xs4all.nl> <5dCv9.2205$B72.email@example.com> <3DBFD2B9.firstname.lastname@example.org>
Subject: Re: Philips XA architecture design
Date: Wed, 30 Oct 2002 23:28:26 +0100
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Organization: EuroNet Internet
NNTP-Posting-Date: 30 Oct 2002 21:32:01 GMT
"Noname Nospam" schreef in bericht
> Tim Kortekaas wrote in message
> > 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?
> You seem to be missing the mark here.
Good that at least one person actually read what was written ;)
I stopped reading after '8bit eproms of 8KB' and assumed the
rest was okay.
I tried to explain that this 16bit processor looks at its memory
the same way an 8bit processor does. A range of adresses, each
adress containing one byte. A wider 16bit bus does not change
this, but it *does* transfer 2 bytes per read cycle. One byte from
a 'low' adress, and another one from a 'high' adress. Adress meaning
here the adress in the processors memory map. How and where it is
stored in eprom, is of no importance. We could even shuffle the
eproms datalines in any order we want, as long as we shuffle the
bytes in the programmer-file in the same way.
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