Re: gEDA-user: 74xx symbols

[Chris Ellec <chris.ellec@aegisdevices.com>]

Jim Battle wrote:


> Finally, I noticed that some parts don't have the implicit power and 
> ground nets defined in the symbol, thus if the chip is used, these nets 
> must be added on each instance.
> 

We talked about that maybe a year ago or so. IIRC the final consensus 
was that with design being more and more mixed voltage, it would be 
better to leave the VCC and GND out of the part definition, and let the 
users add whatever is required.

One of my design right now has both 5V and 3.3V, with half the logic 
using one supply and the other half using the other supply. So I have to 
  make sure the parts have the right power connections. You can't do 
that  if the part definition is glued to Vcc.

Chris.