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Why ERC does not detect unconnected pins

autodeskguest

The subject sums it up. I relied on the ERC, when making my schematic, to

check the connections. There were no warnings or errors regarding

unconnected pins. The places that the pins are not connected are only

visible when zooming in so that a gate takes the entire screen.

 

How is this prevented?

 

Thanks,

Matt

 

 

 

Parents

  • Matt Barrett wrote:

    This is a workaround, which still could have resulted in the mistake and is

    not practical for large designs. I guess the ERC does not function the way

    it is described in the help menus.

     

     

     

    "Ing. J.M. Rafetseder" <jrafetseder@hotmail.com> wrote in message

    news:fqmplj$t1n$1@cheetah.cadsoft.de...

    Use frequently "show" to higlight net(s) & pin(s).

     

     

     

     

    I have found two main reasons that causes this.

     

    1. Your grid is set too fine. Use a coarser grid,

    normaly 0.01" or 0.005 is ok. This forces the net

    to snap correctly to the pin.

     

    2. The main cause would be the pin type. If the

    pin is passive or NC then ERC will not detect the

    fault and rightly so. Pins marked as IN OUT or

    both will give you a result.

     

    Hope this helps

    Rudi

     

Reply

  • Matt Barrett wrote:

    This is a workaround, which still could have resulted in the mistake and is

    not practical for large designs. I guess the ERC does not function the way

    it is described in the help menus.

     

     

     

    "Ing. J.M. Rafetseder" <jrafetseder@hotmail.com> wrote in message

    news:fqmplj$t1n$1@cheetah.cadsoft.de...

    Use frequently "show" to higlight net(s) & pin(s).

     

     

     

     

    I have found two main reasons that causes this.

     

    1. Your grid is set too fine. Use a coarser grid,

    normaly 0.01" or 0.005 is ok. This forces the net

    to snap correctly to the pin.

     

    2. The main cause would be the pin type. If the

    pin is passive or NC then ERC will not detect the

    fault and rightly so. Pins marked as IN OUT or

    both will give you a result.

     

    Hope this helps

    Rudi

     

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