Generating GDSII and MOSIS information from CMOSedu.com
MOSIS customers, and anyone with questions about MOSIS, are invited to try using the new MOSIS Customer Support and Inquiry System at http://www.mosis.com/pages/support.
Information about the MOSIS Educational Program (MEP) is found here.
Frequently asked questions such as what processes are available through the MEP are found here.
Below are examples of how to fill out the forms for submitting designs in GDSII format (aka GDS or Stream) for fabrication through MOSIS in ON’s C5 process (500 nm, 3 metal layers, 2 poly layers, see information from ON here)
To generate a GDSII file
A GDS file of your chip may be generated in the Electric CAD system by going to File -> Export -> GDS II (Stream)…
A GDS file can be read into Electric using File -> Import -> GDS II (Stream)…
In the NCSU Cadence IC61 setups located in $HOME/ncsu-cdk-1.6.0.beta/lib/NCSU_TechLib_ami06 overwrite the layer map (which is incomplete, a bug in the IC61 beta setups) with NCSU_TechLib_ami06.layermap (a complete layer map of the MOSIS GDS layers).
If the cell you want to fabricate is called CHIP, and it’s in a library called PxC_CHIP, then here is how the Stream Out menu is setup (hit Translate to generate the stream, aka GDS, file). The stream (GDS) file is saved in your working directory
To check that you have generated the GDS file correctly using Cadence IC51, IC61, Electric, Silvaco EDA, or whatever layout tool you are using, download KLayout or OwlVision and compare the layers seen using this tool to the layers seen in the layout tool you are using.
To submit a design to MOSIS
To begin login to your MOSIS account here.
Next create a new project.
Then fill out the following (for example).
In general, it’s okay to specify “Yes” to the “Fill Authorized:” question to help your chip meet the minimum
density requirements for CMP. One example where you many not want fill is if you have photodetectors
on you design. Fill on any of the layers may block the light from hitting your photodetector.
Next fill out the order information.
The MOSIS Educational Program (MEP) instructional account provides 5 chips per submitted design in
ON’s C5 or IBM’s 8RF-DM processes (see: http://www.mosis.com/pages/Faqs/faq-education). All to none of the
5 chips can be packaged in a 40-pin DIP. If 4 of your designs are to be packaged then 1 should be specified
in the unpackaged (bare die) field as seen below.
After hitting the Submit button return to the MOSIS login center here and enter the design number you receive in an email
and the design password you selected above (not your MOSIS account/document password).
Then select Submit ECCN questionnaire, fill out the form, and then select Fabricate as seen below (go back to the project
management page if needed).
Before we can submit the GDS file for fabrication we need to download the mosis crc executable for determining the
Checksum and Count here.
In Windows Start -> Run -> Cmd to open a terminal then navigate to where you saved this executable and the binary
GDS file (e.g. save both in C:\Electric as seen below).
Then type: mosiscrc -b chiptop.gds where “chiptop.gds” is the name of the GDS file you want to fabricate.
Notice the output is a checksum number (first, larger number) and count (second, smaller number).
Next fill out the layout transfer method and information forms seen below.
After hitting the Submit button you will get the following. Click on the link to upload your design.
After choosing the GDS file, here chiptop.gds located in the C:\Electric directory, and uploading we get the following.
MOSIS will email you a link to a bonding diagram for the design.
Other emails will be sent after checking the design (using the checksum and count) and after the design is queued for fabrication.
Some other notes.