John Larkin wrote:
John Larkin wrote:
John Larkin wrote:
[...]
I never do hierarchical schematics. Everything's flat.
Then we have almost opposite CAD habits. But at least we have similar
beer taste, only the good stuff
What happens to reference designators in a hierarchical schematic?
Typically it numbers right on through if you hit auto-number. But it
really never mattered to me in my Orcad days because most clients wanted
a back annotation anyhow, so that the top left of the physical PCB
started with R1, C1 and the bottom right would end with R542, C367. Then
that got fed into the schematic, I updated my module spec with the new
refdeses, done.
I don't understand that. If the schematic has a main controller part
and, say, 16 channels, and you draw one instance of the channel,
abstract that into a block, and draw 16 of the blocks - which is what
a hierarchical schematic does - how does each instance have its own
reference designators, sequantial across all the modules?
Yes, it just starts with the next available number at block 1, then goes
on to block 2 and so on until all sub-sheets are done. For proper
documentation you must let it print out all 16 blocks, otherwise a
technician could never repair the unit. For a design review you don't
necessarily have to (in med or aero and such you usually do).
We're planning on setting the service and test departments up with
schematic viewers so they can use the hierarchy.
