Re: MAX Machine PLA equations

From: Segher Boessenkool <*segher_at_kernel.crashing.org*> Date: Sat, 6 Aug 2016 13:14:45 -0500 Message-ID: <20160806181444.GC11050@gate.crashing.org> · segher_at_kernel.crashing.org

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.

Segher

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