Re: gEDA-user: subnets

[Ouabache Designworks <z3qmtr45@xxxxxxxxx>]

     Using blocks in mechanical CAD has some issues with this. In
     principle
     there are 2 ways to use a block:
        a) copy and paste
        b) reference
     Naturally the "edit one modify all" can only work with referencing.
     Sometimes in a single construction this is not desired, so when
     duplicating
     one has the choice between reference and copy. With mechanical
     constructions
     this goes as far as changing the appearance of a referenced block,
     when
     when an external block is changed independently. This can be useful,
     if the
     interface of the block is well understood.


   Asic synthesis has a step called "uniquification" where you create a
   module and
   instantiate it multiple times.  Uniquify  will create  a new module for
   each instance
   that can be modified independently from the others.  You can also
   modify the master
   to change all the instances.
   It can get a little messy in that once you modify an instance then you
   can no longer
   touch the master or else all changes to the instance are lost.
   John Eaton


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