Re: MAX Machine PLA equations

From: Segher Boessenkool <>
Date: Sat, 6 Aug 2016 13:14:45 -0500
Message-ID: <>
On Sat, Aug 06, 2016 at 07:13:35PM +0200, Francesco Messineo wrote:
> > If nothing drives an address line it will hold its value for a value,
> > and eventually drop to 0.  There is nothing that would pull the line
> > one way or the other as far as I can see.
> afair, TTL (and NMOS too) floating inputs always go to "1".

Unconnected TTL inputs act as high.
Unconnected NMOS inputs act *as float*.

Some chips have pullups (or pulldowns) on some pins.  Most don't.


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Received on 2016-08-06 19:00:25

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