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Design Languages >> Verilog-AMS >> Any Guide for Dummy in Coding Verilog A ?
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Message started by 337see733 on Sep 13^th, 2006, 1:51am

Title: Any Guide for Dummy in Coding Verilog A ?
Post by 337see733 on Sep 13^th, 2006, 1:51am

Dear ALL,

This may sound a bit stupid. I'm trying to look for a simple guide to start to code a model using verilog A.

How should i go about doing it?

1.Which compiler is easy to use? Anyone that is free/window-based?
2.There are quite a number of models available for download(a good starting point), how to view it in Cadence or Mentor's tool?

That's to help me to kick start the learning curve. Thanks.

Title: Re: Any Guide for Dummy in Coding Verilog A ?
Post by Geoffrey_Coram on Sep 13^th, 2006, 5:15am

Best starting point is an existing model. Find something close to what you need to build.

Are you doing a device model, like a diode? Or a gate-level model?

I've never used anything but a text editor to view the model ... not quite sure what you want to see. There is a company (Lynguent) that is developing a GUI for model development.

What simulator are you going to run it in? The question about a compiler is probably not relevant - you don't really want to see the C code produced by the compiler, you want the compiled object to run in your simulator. Spectre comes with a compiler; last I heard, Eldo's compiler required a special license.

There is an open-source, Win32-based compiler called ADMS, but you need special scripts to convert the output for your favorite simulator, and then you need the license for the C modeling interface. So, I don't think this is what you want.

Title: Re: Any Guide for Dummy in Coding Verilog A ?
Post by jbdavid on Sep 13^th, 2006, 10:41am

I'd suggest looking at Papers on the BMAS website www.bmas-conf.org..
but if you want the EASY way - signup for the Cadence class.
by the end you'll have written 3 or four models.

jbd

Title: Re: Any Guide for Dummy in Coding Verilog A ?
Post by 337see733 on Sep 14^th, 2006, 4:25am

Quote:

Are you doing a device model

Yes, i'm doing a MOSFET model similar to the one of MOS11.

Quote:

What simulator are you going to run it in? The question about a compiler is probably not relevant - you don't really want to see the C code produced by the compiler, you want the compiled object to run in your simulator. Spectre comes with a compiler; last I heard, Eldo's compiler required a special license.

At this point of time, i have access to Cadence's product. Therefore, i assume i will run in spectre. But, before i finished all my coding(/my model), i would like to view some of the (intermediate)results for debugging...like checking whether the internal function behaviors are right or not....

I'm looking some software/tool that allows me to probe the internal function behavior for debugging purposes. I have all the equations ready in Matlab, but now need to code it in Verilog-A so that i can connect to simulator.

I should check the ADMS up, till then...Thanks....

Title: Re: Any Guide for Dummy in Coding Verilog A ?
Post by Mighty Mouse on Sep 14^th, 2006, 7:35am

Perhaps I am stating the obvious, but there is also Ken's book on Verilog-AMS: http://www.designers-guide.org/Books/dg-vams/index.html. It has a whole chapter dedicated to introducing and teaching Verilog-A.

- MM -

Title: Re: Any Guide for Dummy in Coding Verilog A ?
Post by 337see733 on Sep 14^th, 2006, 7:51pm

Yes..reading that book. ;D

Title: Re: Any Guide for Dummy in Coding Verilog A ?
Post by LRC on Oct 18^th, 2006, 7:23am

You can find plenty examples of verilog-A in:
$CDSHOME/dfII/samples/artist/spectreHDL/Verilog-A

The reference doc in CDSDOC is useful material. Good Luck. ;)

Title: Re: Any Guide for Dummy in Coding Verilog A ?
Post by Geoffrey_Coram on Oct 19^th, 2006, 4:24am

337see733 wrote on Sep 14^th, 2006, 4:25am:

Yes, i'm doing a MOSFET model similar to the one of MOS11.

Then you should look at the MOS11 Verilog-A code on this web site (click on the Verilog-AMS link in the upper right).

Quote:

In spectre, any variables at module scope are available for plotting with "save M1:all" (assuming M1 is the instance name of your Verilog-A model). Also, spectre supports the $debug() system task so you can print out values of internal variables during the iterations.

-Geoffrey

Title: Re: Any Guide for Dummy in Coding Verilog A ?
Post by jbdavid on Oct 22^nd, 2006, 10:17am

Also don't forget that cadence ADE has the AHDL Debugger - so you can step thru the operation of your model.
For AMS - the simvision Gui can be used the same way.
I'm still looking for a free simulator that supports verilogA/AMS
specifically for student use.
Jonathan