Re: gEDA-user: Hierarchy Refdes and Component Values

[kai-martin knaak <kmk@xxxxxxxxxxxxxxx>]

Rick Collins wrote:

>  With the hierarchical ref des it tells you which 
> instance.  With component renumbering you have to search to find the 
> right sheet... the same as non-hierarchical schematics.

If the refdes of a resistor in the layout reads "3R12" I know
it is on page 3 of my schematics printout.


> There is more than one way to view instantiation.  You don't have to 
> "see" it as the exact same, single sheet.  If you do, there is no 
> way to have your documentation in step with the actual board 
> produced...

It sure is in step. The hierarchy of schematic is just not flattened 
out. 


> The way you are viewing subsheets, they are macros and 
> the schematic is a programming language. 

In a way, this is always the case, even with a flat schematic. 
Symbols get mapped to footprints according to some rules.
E.g, symbols with the same refdes are all part of the same
component.


> A schematic is intended to 
> be documentation and each page has to show the ref des that appears 
> on the final product.

Whether or not this is desirable depends on the work-flow
and on the project. Remember the 69 instants of a sub circuit
I mentioned? This is a real world example. It would not help 
in any way, if I had this sub circuit printed 69 times.


> The only fly in the ointment is back annotation.

ack. 

I got the impression that refdes renaming due to hierarchical
design is the road block that prevents back annotation in 
geda/pcb.

---<)kaimartin(>---
-- 
Kai-Martin Knaak
Ãffentlicher PGP-SchlÃssel:
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