ASSURA LVS error | Custom Inductor | Pin mismatch | Unbound devices

Hi pitter

Would you please upload the following files which can be located in the lvs run directory?

a. design.erc file
b. design.cls file

To upload a file, please go to "Options" tab and use the "file attachment" function.

Thanks
Quek

Hi Quek,

 here are the files you asked. They have been generated without adding a line in bind.rul file and using indDevice command.

Thanks,
pitter.

Hi pitter

From erc file, we can see the following:

  info: Assign pin label "Pout" at (388.050, -938.250) to layer `net_met2'.
  info: Assign pin label "vdd!" at (1270.800, -927.400) to layer `net_met1'.
  info: Assign pin label "gnd!" at (304.800, -927.050) to layer `net_met1'.
  info: Assign pin label "Mout" at (384.300, -931.250) to layer `net_met1'.
  WARN: Multiple label discarded: "Mout" at (384.300, -931.250) and "Pout" on net C3.
  info: Assign pin label "RestartTrigger" at (1265.650, -940.500) to layer `net_met1'.

It looks like labels "Mout" and "Pout" might have been mistakenly placed on the same net. Would you please try to correct this? Because both labels are on the same net, Assura discards them and hence results in missing Mout and Pout layout pins.


Best regards
Quek

 There is a section in the VPCM User Guide called "Virtuoso PCD black-box Recognition and Extraction
Using Assura" which explains how to modify your existing LVS rules to recoginze PCD inductors.

You are right Quek.

 But the error is caused by the architecture of the differential VCO. Namely the differential output is labeled with pins, that in turn is connected to the spiral. The spiral (there is actually a couple of spirals) is treated by Assura as a typical connection, a short.

I will get familiar with the suggested section of the VPCD User Guide. I've just only had a brief look on it, it looks like it addresses the issue, but might be challenging. Modifying PDK scripts - I have never done it, but I will give it a try.

Thanks both of you,

 Take care,
     pitter.

Hi,

As for the problem 1) (described in the very first post of this thread), there is a avParameter ?blackBoxCell in the LVS run dialog box. By its means, I can specify the balck box cell (custom inductor Ind1). It solves the problem 1). But I still get errors concerning the unnbound pins between schematic and layout of the inductor.

Hi pitter

Would you please post the contents of the erc file?

Best regards
Quek

Hi Pitter, Quek

Have you figured out about the pin errors? I ran into the same problem...

Thanks,

Ran