[PCB_FORUM] Re: POP

We have done similar things for years, with socketed parts (EPROMs, etc.).
The schematic part is drawn to show the logical pinout of the underlying
component, but the PART_NUMBER field in the physical parts table is left
blank.  Then there are one or more dummy (mechanical) parts placed in the
schematic for the socket and/or programmed EPROM.  These parts have no pins,
hence no connectivity and no effect on the board layout but DO have valid
PART_NUMBER fields in the physical part table files.

 

We then run a script on the extracted BOM that filters out anything with a
blank PART_NUMBER field, so the underlying schematic part is dropped from
the BOM but the socket and/or programmed EPROM do appear in the BOM.

 

It would be easy to do the same sort of thing where your processor appears
as a "real" part in the schematic (with the appropriate PART_NUMBER
property) and you then add a mechanical part for the SDRAM that piggybacks
on top of it and carries its own PART_NUMBER property.

 

For programmed EPROMs, we usually used a reference designator of just "Uxyz"
as you would expect.  For the socket, we would put in "USxyz" for the
"socket" for Uxyz to make it easier for us to understand what went where.

/s/jar (Alan Ritter, alan.ritter@xxxxxxxxxx)
        http://www.mtritter.org <http://www.mtritter.org> 
  

  _____  

From: Bradley, Shirley [mailto:shirley.bradley@xxxxxxxxxxxx] 
Sent: Monday, September 29, 2008 11:35 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: POP

 

This is a OMAP part. The processor part is loaded on the board and the the
SDRAM part is loaded on the processor. I have the processor in the library
as a regular part and would like to enter the SDRAM part in the library so
it would show up on the bom's and we would like to show it loaded on the
processor on the assembly, but no wires to route on the board. We would like
to somehow associate the reference from the top part to the bottom part. Can
a mechanical part have a reference designator and show it being loaded on
the assembly diagram? 

I hope this explains things a bit better. I am treading new waters and don't
know how to swim. 

 

Shirley

 

  _____  

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Bolman, Shirley H
Sent: Monday, September 29, 2008 11:17 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: POP

Enlighten me. I have never heard of POP ic's.

 

Please let me know if you have any questions. 
Shirley 

It is a PRIVILEGE to be born free. 
    It is a RIGHT to live free. 
        It is a DUTY to die free. 

  _____  

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Bradley, Shirley
Sent: Monday, September 29, 2008 9:10 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] POP

 

Good Morning,

 

Is anyone using POP ic's? How are your handling it? Are you entering the POP
SDRAM as a mechanical part? 

 

Shirley M. Bradley

Cad Librarian

Intermec Technologies

319.369.3328






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