open-source-silicon.dev

I'm running a transient, then dc analysis:
`.param mc_mm_switch=0`
`.control`
`save all`
`tran 500p 2u uic`
`set appendwrite`
`write testbench.raw`

`set appendwrite`
`dc Vcm 0 1.8 0.01`
`write testbench.raw`

`*quit 0`
`.endc`
`.end`

image.png

when spice finishes, I can plot mod_r and bus

but I can't find a way to do that inside xschem

the mod_r signal is not in the signal list

I've tried changing the dataset from -1 to others, but it doesn't seem to make a difference

I guess it's an issue with saving the signals

writing to a different test bench file works

<@U0172QZ342D> can you send the complete .spice file? also try to add a `remzerovec` line before the write instructions.

this is what I have atm: <https://github.com/TinyTapeout/tt_asw_1v8/blob/main/xschem/testbench.sch>

why the remzerovec? I thought that was just for performance issues on big files - or does it effect other things

In some cases if  a vector contains no data (for example body current of a mosfet) instead of just skipping it ngspice botches and does not write the raw file.
I consider this a ngspice bug. However adding `remzerovec` before `write` fixes the issue (i always add this line before write).

I spoke too soon, I had the dataset set in the graph window

setting it back to testbench.raw and the signals are gone again

<@U0172QZ342D> I also saw a problem in your commands.
If you have `set appendwrite` before the first `write` command in a testbench you will keep appending data to an ever growing raw file and xschem will load the first sections so you don't see the last simulation data but only the first datasets.

---
`.param mc_mm_switch=0`
`.control`
`save all`
`tran 500p 2u uic`
~`set appendwrite`~
`write testbench.raw`

`set appendwrite`
`dc Vcm 0 1.8 0.01`
`write testbench.raw`

`*quit 0`
`.endc`

have just startd to write everything to its own file to help debug

my pattern is like
```set f=some_circuit
shell rm -v {$f}*
set appendwrite

...

tran whatever
write {$f}-tran.raw
tran again
write {$f}-tran.raw

dc whatever
write {$f}-dc.raw```
so i can freely add and remove analyses without worry

I have also made very heavy use of the new shift-T shortcut to disable/enable code_shown.sym to toggle between different experiments. Thanks again <@U01819B63HP>