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Accessing auCdl Netlist name

Kevin Buck

Several months ago I created a custom netlisting function roughly following this solution:

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O3w000009xxONEAY&pageName=ArticleContent

I made some improvements to the code which allows the function to not care about the order of the terminals (only the names) and it is available here:

https://community.cadence.com/cadence_technology_forums/f/custom-ic-skill/50856/spectre-netlisting-multiple-instance-resistors

Our layout engineer just discovered a bug that exists in both the Cadence solution and my code. Another designer made a schematic with an arrayed series resistor with both terminals tied together, it looks like this:

The custom netlisting function shorts all of the internal nets of the arrayed device together because it uses an incremented number and the device name to define the internal subcircuit net. Looking at the auCdl netlist the device name actually increments so I'm interested in somehow acquiring that variable and adding it to the net name to avoid this collision. I haven't found a way in the custom netlisting functions to obtain this variable.

.SUBCKT resistor_lvs Rbot Rtop vdd018

*.PININFO Rbot:I Rtop:I vdd018:I

RRNHR_8<7>_1_1 Rtop RNHR_8<7:0>_sNet_1 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<7>_1_2 RNHR_8<7:0>_sNet_1 RNHR_8<7:0>_sNet_2 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<7>_1_3 RNHR_8<7:0>_sNet_2 Rbot $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<6>_1_1 Rtop RNHR_8<7:0>_sNet_1 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<6>_1_2 RNHR_8<7:0>_sNet_1 RNHR_8<7:0>_sNet_2 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<6>_1_3 RNHR_8<7:0>_sNet_2 Rbot $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<5>_1_1 Rtop RNHR_8<7:0>_sNet_1 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<5>_1_2 RNHR_8<7:0>_sNet_1 RNHR_8<7:0>_sNet_2 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<5>_1_3 RNHR_8<7:0>_sNet_2 Rbot $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<4>_1_1 Rtop RNHR_8<7:0>_sNet_1 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<4>_1_2 RNHR_8<7:0>_sNet_1 RNHR_8<7:0>_sNet_2 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<4>_1_3 RNHR_8<7:0>_sNet_2 Rbot $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<3>_1_1 Rtop RNHR_8<7:0>_sNet_1 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<3>_1_2 RNHR_8<7:0>_sNet_1 RNHR_8<7:0>_sNet_2 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<3>_1_3 RNHR_8<7:0>_sNet_2 Rbot $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<2>_1_1 Rtop RNHR_8<7:0>_sNet_1 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<2>_1_2 RNHR_8<7:0>_sNet_1 RNHR_8<7:0>_sNet_2 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<2>_1_3 RNHR_8<7:0>_sNet_2 Rbot $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<1>_1_1 Rtop RNHR_8<7:0>_sNet_1 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<1>_1_2 RNHR_8<7:0>_sNet_1 RNHR_8<7:0>_sNet_2 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<1>_1_3 RNHR_8<7:0>_sNet_2 Rbot $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<0>_1_1 Rtop RNHR_8<7:0>_sNet_1 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<0>_1_2 RNHR_8<7:0>_sNet_1 RNHR_8<7:0>_sNet_2 $SUB=vdd018 $[RNHR] $W=1u $L=5u

RRNHR_8<0>_1_3 RNHR_8<7:0>_sNet_2 Rbot $SUB=vdd018 $[RNHR] $W=1u $L=5u

.ENDS
I'd like to get the highlighted variable in the angled brackets to insert into the net name instead of the instance name. Is there a way to do this?

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