It's ok I'm the hardware guy too! But thanks for warning, it was =
actually in
the
NI manual!

/niklas

-----Ursprungligt meddelande-----
Fr=E5n: Bob Barr [mailto:bbarr@CALIFORNIA.COM]
Skickat: den 16 april 2002 17:38
Till: PICLIST@MITVMA.MIT.EDU
=C4mne: Re: [PIC]/[AVR]:parsing...


On Tue, 16 Apr 2002 15:42:18 +0200, Niklas L=F6vgren wrote:

>I'm about to write software for communicating with a NAT 9914 gpib
>interface.

A note of caution on the 9914 - Be sure that your hardware folks check
the connections of the data bus. When TI designed the 9914, they used
the old (DEC?)  convention of D0 =3D msb, D7 =3D lsb. It is really easy =
to
miss that and end up with the whole data bus reversed.

Also, once the schematic is done, make sure that the layout person
doesn't 'fix' the apparent error of having the data bus reversed.=20

This may not be much of a problem given the current use of CAD
schematic entry and layout but it's something to be aware of. Yes, it
does look weird to have the micro's D0 hooked to the 9914's D7 and
vice versa, but that's just the way the darn thing works.


Regards, Bob

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