Hello, I was discussing with @aquiles viza and we were wondering if anyone did or is currently doing LVS of their designs with the pads? or LVS for a configured digital PAD? I'm currently struggling with the LVS in Klayout for the analog pad

asig_5p0

and the digital pad

bi_t

, the extracted netlist for the analog pad only shows 2 devices

.SUBCKT asig_5p0 ASIG5V DVSS DVDD
D$1 ASIG5V DVDD diode_pd2nw_06v0 A=600P P=424U
C$5 DVDD DVSS 1.863e-11 cap_nmos_06v0 A=8100P P=2160U
.ENDS asig_5p0

But it should be at least 4 devices as in the subck from the subckt cell in

libs.ref/gf180mcu_fd_io/spice/gf180mcu_fd_io.spice

.SUBCKT gf180mcu_fd_io__asig_5p0 ASIG5V DVDD DVSS VDD VSS
D0 DVSS DVDD diode_nd2ps_06v0 m=4.0 area=40e-12 pj=82e-6
X1 DVDD DVSS cap_nmos_06v0 m=36.0 c_length=15e-6 c_width=15e-6
D2 DVSS ASIG5V diode_nd2ps_06v0 m=4.0 area=150e-12 pj=106e-6
D3 ASIG5V DVDD diode_pd2nw_06v0 m=4.0 area=150e-12 pj=106e-6
.ENDS

I tried the LVS without modifying the layout and modifying it (only to connect power rails with the same name), but the result was the same. Any insight is appreciated @Amro Tork @Gabriel Maranhão @Atif Khan

@Sebastian Sanchez Not sure what the best solution for this is. The missing

diode_nd2ps_06v0

diodes are extracted with this rule in

diode_extraction.lvs

# diode_nd2ps_06v0 diode
<http://logger.info|logger.info>('Extracting diode_nd2ps_06v0 diode')
extract_devices(diode('diode_nd2ps_06v0'), { 'N' => diode_nd2ps_06v0_terminal_n, 'P' => lvpwell_con })

However, there is no

lvpwell_con

in

asig_5p0

so the devices aren’t recognized. The easiest “solution” might be to comment out the diodes in the source netlist. It is possible to change the rule file to extract these diodes, but this involves redefining the sub layer, recognizing the isosub

23/5

layer, and some other changes and I still can’t get a clean LVS. Extracted

* Extracted by KLayout with GF180MCU LVS runset on : 12/05/2024 07:52

.SUBCKT gf180mcu_fd_io__asig_5p0 ASIG5V DVSS DVDD
D$1 DVSS ASIG5V diode_nd2ps_06v0 A=600P P=424U
D$5 DVSS DVDD diode_nd2ps_06v0 A=160P P=328U
D$9 ASIG5V DVDD diode_pd2nw_06v0 A=600P P=424U
C$13 DVDD DVSS 1.863e-11 cap_nmos_06v0 A=8100P P=2160U
.ENDS gf180mcu_fd_io__asig_5p0

Source

.SUBCKT gf180mcu_fd_io__asig_5p0 ASIG5V DVDD DVSS VDD VSS
D0 DVSS DVDD diode_nd2ps_06v0 m=4.0 area=40e-12 pj=82e-6
CX1 DVDD DVSS cap_nmos_06v0 m=36.0 c_length=15e-6 c_width=15e-6
D2 DVSS ASIG5V diode_nd2ps_06v0 m=4.0 area=150e-12 pj=106e-6
D3 ASIG5V DVDD diode_pd2nw_06v0 m=4.0 area=150e-12 pj=106e-6
.ENDS

Does anyone know what “already seen” means? (or is the problem with the parameters?)

Thanks a lot @Mitch Bailey, I'm gonna see if I can make it work with the changes you mentioned

Does anyone know what “already seen” means? (or is the problem with the parameters?)

@Matthias Köfferlein?