User guide
Mechanical Data
PCN Process User Guide (301945-A)
Putting Data on EDA Servers: 4-9
For a full description of the procedure, see the references to document
SPECIFICATION PCB DELIVERABLES, Rev 02 (117291-A) and the Hardware
web page for back annotating a board in
Appendix F.
The
schematic
.tel
file that you send to the PCB layout designer contains an “F
number” followed by a number representing each component instance on the
schematic (e.g., F0234). This is what Allegro uses to keep track of components.
You may need to delete some items from the backwards annotation file (e.g.,
mounting holes seem to cause some problems), but be careful. Check the errors to
make sure that the backwards annotation works. If any errors occur, the process
will stop and will not backwards annotate.
Caution:
It appears that the “F” numbers are not stored anywhere, but instead simply recalculated
each time you run
to_allegro
or
fm_allegro
or even just save a schematic sheet. This means that
you
must not
modify your schematic (even for non-component or signal info, such as device
attributes, text, comments, cross refs, etc.) from the last time you give the PCB layout designer a
.tel
file until the time you get a
.abk
file back. If you do, the backwards annotation process will
either outright fail or will assign incorrect reference designators to components.
To provide updated schematic information:
1.
When the PCB layout designer is done renumbering the board, you
should receive a backwards annotation file (e.g.,
schematic
.abk) that
associates the new reference designators to the “F” numbers.
2.
Run the “Allegro to Powerview” conversion program,
to_allegro
, and the
new reference designators should end up on the schematic .d2h file.
3.
Create the directory
PartNum.nn
in /bay
dir
/dra/2brel/mech/ and put
these files in it:
a.
The back-annotated
schematic
.d2h
file.
b.
The 11x17” PostScript files, where
nnn
is the page number and
p
is a
Viewlogic convention, e.g.,
/bay
dir
/dra/2brel/mech/1151560A.01/
115156-A.001p
,
115156-A.002p
, etc.
c.
Either a single .
ps
PostScript file of the schematic, or a concatenation of
the individual PostScript sheets into one file called
PartNum
.ps
, e.g.,
issue the command:
cat 115156-A.001p 115156-A.002p 115156-A.003p > 115156-A.ps
Note:
The West Coast does not concatenate the files.