Gemini pin file definition

Is this what you need?

Regards,

Andrew

Andrew,

When I click on the link above, it tries to get me to register again to access this site.  I am logged in using my email and password.  Why is it asking for a new registration?

Thanks.

John,

The support portal (support.cadence.com) requires you to be a Cadence customer - and so we need to know either your domain (for certain customers) or your license server hostid (for most customers) so that we are aware of which products you have under support.

The community forums require a login for identification, but anyone (unless they've been blocked) can participate in the forums, regardless of whether they are a customer under a maintenance contract or not.

So the registration is separate, intentionally.

Regards,

Andrew.

I just got your reply while I was typing this up. I just registered for the support from the Cadence support site. I looked at the solution above, but it not the solution for my group. Ultimately we are searching for an SVS tool, and I have used gemini in the past for SVS. I had used a pinfile to define pin swappablity for subckts, but cannot remember the exact format. I believe the file was used with the "-pin pinfile" option in gemini. I remember it had a format something similar to: "cktname 1 2" but if pins 1 and 2 were swappable, it may have been something like "cktname 1 1" , but that does not work when I tried it. There was something special to tell gemini that these pins could be swapped, I just do not remember what it was. The man page/help screen has been taken away. Is there any other man page available for it . Maybe there is a better tool than gemini for our needs. We have to check two schematics - one relatively flat versus one with hierarchy to make sure they are the same for simulation purposes. We have some special subckts that have two inputs that can be swapped, but if they are, gemini states the circuits are mismatched. These schematics can get quite complex, and we need to be able to guarantee that they are the same. Again, maybe there is a better tool that you can recommend - I just chose gemini because I know it exists and used it in the far past. Thank you.

Hi John,

As far as I know, gemini is part of QRC, so using it for SVS is a bit of an unusual use of what it's intended for.

A better approach would be to do this via Assura or PVS directly - both support (and document) ways of comparing a schematic versus a schematic. This is after all a subset of what LVS has to do - essentially an NVN (Netlist versus Netlist). Assura documents "Comparing two schematics" and I'm sure there's something similar in the PVS docs (I didn't check). Just run cdnshelp from the Assura or PVS installation to search for it.

Then you'd have all the same power for pin swapping etc that your LVS tool has.

Regards,

Andrew.

Thank you Andrew. We will look into the NVN features of Assura directly as that may be easier to use. I know gemini evolved from a program called gemini3 created by BLDA (Bell Labs Design Automation) which was sold to Cadence when they bought BLDA in the late 1990's or early 2000's. It was an SVS tool at that time - we used a program to extract the schematic flat from the layout, then gemini3 to do the SVS - that is the old way of doing an LVS. That is why I remember it, but in a hazy way since it was many years ago. When I was using Assura, a colleague told me that gemini3 was in Assura as "gemini". I used it for some SVS use, but still that was many years ago. I see it has migrated purposes since then.