Re: Pull up resistors on Spartan 3 mode pins
- From: "Peter Alfke" <alfke@xxxxxxxxxxxxx>
- Date: 29 Apr 2006 16:16:01 -0700
For crying out loud, do not make a federal case out of this!
If the documentation asks for a short circuit, then do it!
If your gut feel says there is no need for any external pull-up at all,
then measure the internal pull-up impedance the way I suggested, and if
it is below 3 kilohm, then connect nothing.
If the FAE suggests an external resistor, so use one.
This may be a question of belts or suspenders or both or neither...
But remember: If you want to establish a logical Low level, you must
definitely be cautious and measure whether you are fighting an internal
pull-up.
I much rather spend 10 minutes with a multi-meter than indulge in
contankerous debates in the newsgroup.
We are all engineers and not scribes, aren't we?
Peter Alfke, obviously somewhat irritated...
Like Austin, I am human, too.
Even though we always wear the Xilinx badge, we are still allowed to
voice an opinion...
.
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