Tying a digital input directly to a power rail is a bit like doing a
crossword puzzle in ink. You need a lot of confidence to do that in
a real design. I typically use a resistor to pull them up or
down. That can always be hacked, power connections can be hard to
access to modify them.
Rick
At 09:22 AM 9/27/2010, you wrote:
kai-martin knaak wrote:
Karl Hammar wrote:
Running gnetlist -g drc2 on a schematic I get:
input/output <--> pwr
input and output are meant to refer to signals. The DRC assumes
that signals should never be connected to power lines. With analog
circuits there is no strict dividing line between signal and power.
So DRC should be taken with a large grain of salt on these circuits.
From what I know, it's a bad idea to leave logic inputs floating,
so on TTL/CMOS gates,
one will tie them to GND if not used. GND is a power line, isn't it?
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