|
|
The most frequently asked questions about warnings and messages issued
by MOSIS automatated manufacturability review.
MOSIS FAQs
Warnings and Messages
Manufacturability review may issue one or more errors, warnings, or
other messages. Warnings, by themselves, do not cause
manufacturability review failure, but they may represent a real
problem that you need to address. Errors by their very nature cause a
design submittion to fail. This document lists some sample messages
and warnings, their causes, and suggested resolutions.
|
|
Project Warnings
|
1.0 Path has reversing points at (248,-1260.4) in
structure ABCDEF in record 1234.
2.0 160 paths with colinear points.
3.0 1 path with a reversing point.
4.0 Design pad location is symmetric; bonding
orientation assumed same as submitted design file.
5.0
File contains non-GDSII names (alphanumeric or '_?$')
6.0
Text nodes ignored on layer(s): (This warning indicates an anomaly in
the file that does not compromise our processing of the data.)
|
Messages
|
7.0 Coincident points.
See also
Polygons and Winding Numbers.
|
1.0 Path has reversing points at (248,-1260.4) in
structure ABCDEF in record 1234.
-
Reversing points are a path doubled back on itself. Think of drawing a
"T" without lifting your pencil.
1----3<-->2
|
|
v
4
2.0 160 paths with colinear points.
-
Colinear points are three successive points in a path all in a
straight line, so that the middle one is redundant, since it did not
actually affect the path.
You can eliminate the warnings by cleaning up the redundant points.
The redundant points by themselves do not cause a problem. They are
brought to your attention so you can investigate further if you wish.
3.0 1 path with a reversing point.
-
See number 1 above.
4.0 Design pad location is symmetric; bonding orientation assumed same
as submitted design file.
-
The pad location is symmetric. The "top" is defined by the way the
layout was submitted.
When pad location is symmetric you cannot simply look at the surface
of the
chips pads and determine top from bottom. This is not a fabrication
issue.
5.0
File contains non-GDSII names (alphanumeric or '_?$').
-
This warning indicates an anomaly in the file that does not compromise
our processing of the data.
GDS syntax defines as standard all alphanumeric characters, the
underbar ("_"), question mark ("?"), and the dollar sign ("$"). If a
customer uses additional characters in GDS structure names MOSIS will
generate a warning, but it will not affect our acceptance of or
ability to process the layout. This most often comes up when
customers use periods or dashes in stucture names. MOSIS limits GDS
top structure characters to alphanumeric characters and '_?$.' Any
other top structure characters will generate an error. You will need
to edit the name of your top structure.
6.0
Text nodes ignored on layer(s):
-
This warning indicates an anomaly in the file that does not compromise
our processing of the data.
Text is usually used for labeling when you draw gds on a screen. Our
manufacturability review code is simply explicitly stating that we are
not processing the text as layout.
7.0 Coincident points.
-
Coincident points are two (or more) successive points in a path (wire)
or boundary (polygon) that are the same point repeated. No harm, but
possibly worth investigating.
|
Related Links
Fabrication Schedule
Customer Support
MOSIS Products
|
|
|
