you mean the 4 x 74lvc245's that according to the schematic are
driven with a 3.3v vcc and that only covers the 16 data and first 16
address lines
dave
--- In Curtis Monroe <> wrote:
>
> The pc104 uses 5 volt logic, you can see the 3.3 volt to 5 volt
interface
> chips near the power supply pins on the board (4 of them there).
>
> -Curtis.
>
>
>
> On December 5, 2005 11:20 am, pickanameanditstakensoihavethis
wrote:
> > hi
> > i have just been looking through the diagrams and documentation
> > for the ts7200
> >
> > my first assesment of the pc-104 was that the logic levels
where at
> > 3.5v logic levels and not at 5v logic levels but on a second
look
> > the levels for the pc-104 bus are not stated
> >
> > having 5v on there i suppose supports legacy devices ,but they
> > appear to be driven using 3.5v logic
> >
> > some of the lines look buffered but some are not , rather than
> > make assumptions on this i thought i would be better asking
> >
> > i am currently working on a custom pc-104 expansion card that
is
> > going to be easier to interface with 3.5 v logic levels
> >
> > dave
> >
> >
> >
> >
> >
> >
> >
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