@Tim Edwards hello I am trying to do lvs this error pops up for a second for that I had to screen record and snap the error could you please suggest how to fix the error for reram

It looks fine to me except that netgen doesn't recognize the

N

device used for the ReRAM. Although it may not matter because the device should be compared at the subcircuit

sky130_fd_pr_reram__reram_cell

. Netgen ran, though. Did you look at the output file?

@Tim Edwards output file is blank

How did you generate the device? There are specific differences between the

nfet_03v3_nvt

and

nfet_g5v0d10v5

. The device (poly + diffusion) must be coincident with NSDM, HVI, LVTN, and LVID (3.3V native-Vt FET marking ID). The presence of the special marking ID layer makes it rather difficult to confuse the two devices.

@Rafeeq Khan Mohammed Can you at least share 1T1R_2x2.spice, sch_1T1R_2x2.spice, and the command you are using to run netgen?

@Mitch Bailey i am using the command as .netgen .lvs 1T1R_2x2.spice sch_1T1R_2x2.spice

Thanks! I’ll get back with you later today.

Thank you okay

I don't have a device generator for ReRAM in the sky130B.tcl device generator script. I assume there is only one device per core cell. You can just pull it into the layout manually; e.g.,

getcell $PDK_ROOT/sky130B/libs.ref/sky130_fd_pr_reram/mag/sky130_fd_pr_reram__reram_cell

(I noticed this can't be reached from the "Library Manager" window; clearly I'm a bit behind in integrating the ReRAM devices into the PDK for magic.)

@Rafeeq Khan Mohammed I don’t know if it’s a major problem or not, but I suggest adding top level ports to the layout. Also when you create the schematic netlist, be sure to check

Simulation

->

LVS

->

LVS netlist: top level is subckt

@Tim Edwards thank you for the information

@Rafeeq Khan Mohammed I think you mean “layers” and not “labels”. The layers are what determines whether a device is 1.8V, 3V or 5V. The difference in layers between

nfet_03v3_nvt

and

nfet_g5v0d10v5

is layer 81/60 (

nfet_03v3_nvt

should have it and

nfet_g5v0d10v5

should not), but you won’t see this in magic. In magic, the 3.3V devices should be drawn on

nntransistor

and the 5V devices on

mvnntransistor

.

@Mitch Bailey Thank you so much for to make the 3v nntransistor needs to be paint on poly am i correct for 5v same as 3v except paint on poly as nntransistor for 5v mvnntransistor will automatically make layer on poly right?

To create an

nfet_03v3_nvt

, you can paint

poly

over

mvndiffusion

and then paint

nntransistor

over the resulting

mvntransistor

. To create an

nfet_g5v0d10v5

, you can paint

poly

over

mvndiffusion

and then paint

mvnntransistor

over the resulting

mvntransistor

. I think you need 2 steps for either one.

@Mitch Bailey Thank you so much