cannot specify instances during Monte Carlo setup

Without seeing your set up, I can't really help. Presumably it's saying that the instance is not a subcircuit. I suggest you contact customer support (that's what it's for).

Andrew

I am trying to specify 3 out of 5 blocks inside my DUT. In other test, it works well.
I have no idea how one block can be considered as a valid subcircuit or not.

I do not think I can contact customer support with my account.
Thanks, though.

Dear delgsy,

Out of curiosity, are the three blocks you are trying to specify for Monte-Carlo variation unique subcircuits? In other words, are you trying to enable Monte-Carlo variation on one instance of a subcircuit and disable it on another instance of the same subcircuit?

Shawn

Hi Shawn,
yes, they are unique, i.e., different kind of circuit.
to be clear, I have 1 DUT. Inside this DUT is those 5 different subcircuits (A != B != C != D != E).
I just want the variation to take effect only on A, B, and C.

Dear delgsy,

delgsy said:

yes, they are unique,

Thank you!

1.have you followed the instructions from the Explorer manual at:

support.cadence.com/.../techpubDocViewerPage

If you select "subcircuit", the list of available subcircuits will appear from Figure 1 from the above URL. If you do not see one of your subcircuits, it suggests to me that the netlisting process is producing a netlist consistent with your expectations for its hierarchy.

2.  Are all the libraries from which the subcircuits are taken available to spectre? Try to create a netlist as from the Explorer or Assembler and inspect it for your expected subcircuits.

3.  Is this netlist based on a schematic view or extracted view? If it is from an extracted view, the resulting netlist likely does not have schematic hierarchy and hence the identity of the subcircuit is no longer present.

Just a couple of thoughts that came to mind that may or may not be helpful!

Shawn

Thanks for your suggestions.
1. I only see my DUT and other instances that are on my testbench level schematic when I select "subcircuit", but not the subcircuits inside the DUT. I check on another simulation which do not show this warning message, I can see the subcircuits inside the DUT. What could cause this issue?

2. How to check this? All the required instances are schematic view and devices from PDK. The missing subcircuits in the monte carlo setup are there in the created netlist.

3. All are schematic view.

I found this:

I cannot see how usage of noConn can have anything to do with this, or whether the bits are expanded or not.

So far you've not provided anywhere enough information about what you're doing - as I said before, you should contact support through your support channel. If you are at an academic institution, that would be via Europractice support (if under the Europractice scheme) or for other academic institutions support questions can be logged via the owner (e.g. the professor) who is the link for the scheme at your institution. If you're not at an academic institution then there's no reason (unless you're not on maintenance for some reason) that you can't log a support request.

Andrew