[PCB_FORUM] Re: Long reference designators
- From: george.h.patrick@xxxxxxxxxxxxxx
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Mon, 13 Dec 2004 08:53:27 -0800
I have an identical situation on some of our boards, we handle it a little
differently.
We run a program on the output placement files that changes the reference
designator just for the placement machines, and supplies a load list that
cross references the real reference designator with a "local" reference
designator that the machines won't choke on. Even if the ref des is short
enough to fit in the machines (as it usually is)
Like this:
BOM REFDES MACHINE REFDES PACKAGE PN
-------------- -------------- -------------- --------------
C440_0A4 C1 S402
283-1170-00
C440_1A4 C2 S402
283-1170-00
C440_0D0 C3 S402
283-1170-00
C440_1D1 C4 S402
283-1170-00
C440_0A2 C5 S402
283-1170-00
C440_0D2 C6 S402
283-1170-00
and so on...
The point being that we can have a board with a million parts on it, with
the reference designators 40 characters long, and still stuff it using our
old software on our old machines. A bit more hassle, but more flexible in
the long run.
--
George Patrick
Tektronix, Inc.
Central Engineering, PCB Design Group
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
Phone: 503-627-5272 Fax: 503-627-5587
http://www.tektronix.com http://www.pcb-designer.com
It's my opinion, not Tektronix'
-----Original Message-----
From: Dave Seymour [mailto:dave.seymour@xxxxxxxxxxxx]
Sent: Thursday, December 09, 2004 08:42
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Long reference designators
One idea would be to map each page to a letter (or combo)
and loose the "_"
page 1 = A - circuit A
------> page under AA
------> page under AB
page 2 = B
page 3= etc....
page 10 = K ( reducing 2 characters to one.)
Then the ref des could be RNABXXX, which is seven characters.
This method will give 999 refdes per page or RNABCXX gives
99 per page.
Or some sort of theme and variation.
Your lucky, I only get 5 characters for a refdes.
Hope this helps.
dave
Ron Dallas wrote:
> We have some designs that need up to 3 nested lower levels of
> hierarchy to efficiently represent. The lowest level is a 'channel'.
> The next up is a group of 4 channels plus some control logic. Then
> there is a group of 16 of these plus some control logic. And the
> toplevel has several of these groups.
>
> This gives us reference designators like RN11_3_10_6, which is 11
> characters long. Our manufacturing folks say they have a limit of 7
> characters for reference designators.
>
> Any ideas on how to address this? We could 'rename' all the reference
> designators in the design, but that means we lose the benefit of
> hierarchy when developing test fixtures and debugging designs.
>
--
Dave Seymour, CID+
Catapult Communications Inc.
800 Perimeter Park Dr, Suite A
Morrisville, NC 27560
Direct: (919)653-4249
Main: (919)653-4180
Fax: (919)653-4297
Dave.seymour@xxxxxxxxxxxx
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