@holger Herr Holger, I keep running into some bugs that indicates something is very wrong either with the file name or with some kind of automatic updates of the SPICE fields in the symbols. I hope you are aware of some of these issues or you can understand where is the problem, and maybe you can point me in the right direction.
I attached here two examples. Everything is identical between them, except for the name of the ngspice file model: one is named X1-DIG_FLIPD_SN74LVC2G74DCUR.sp, the other one X1_DIG_FLIPD_SN74LVC2G74DCUR.sp (a “minus” character was replaced by an underline character).
For reasons I cannot understand, the project using the minus character in the file name automatically messed-up the pin mapping in the symbol Sim.Pins = 1=2 2=1 3=7 4=6 5=5 6=3 7=4 8=8 instead of Sim.Pins = 1=1 2=2 3=3 4=4 5=5 6=6 7=7 8=8
What is even worse, the ngspice model clearly has the pins mapped one to one without any compromise. Even assuming there is some kind or automatic re-annotation that I am not aware of, still I cannot explain why the pin order is messed-up, not keeping the normal one-to-one matching annotation.
* PINSEQ: 1 = NULL FORBIDDEN, VECTOR NO, digital, input clk
* | 2 = NULL FORBIDDEN, VECTOR NO, digital, input data
* | | 3 = NULL FORBIDDEN, VECTOR NO, digital, output inverted data
* | | | 4 = NULL FORBIDDEN, VECTOR NO, analog, local floating V- reference
* | | | | 5 = NULL FORBIDDEN, VECTOR NO, digital, output data
* | | | | | 6 = NULL FORBIDDEN, VECTOR NO, digital, input asynch. reset
* | | | | | | 7 = NULL FORBIDDEN, VECTOR NO, digital, input asynch. set
* | | | | | | | 8 = NULL FORBIDDEN, VECTOR NO, analog, local floating V+ reference
* | | | | | | | |
.SUBCKT SN74LVC2G74DCUR 1 2 3 4 5 6 7 8 PARAMS:
The circuit works as expected when the mapping is not changed, but when the pins are scrambled I get an error message Fatal error: instance b.x2.b_qn is a shorted ASRC
I have no idea how is possible to end up with the pins scrambled automatically in this order:
And finally, my pulse source V4 is defined y1=0 y2=8 td=1u tr=29u tf=29u tw=1u per=60u but for some very weird reason I will end up with y1=0 y2=1 td=2n tr=2n tf=2n tw=50n per=100n, my ngspice definition is replaced automatically! I an not quite sure why, I suspect that when I use the schematic menu Tools > Update Symbols from Library the custom paramer values are automatically replaced by some hidded default values.
NOTE: any automatic changes in the ngspice-specific fields executed by by the schematic or symbol editor must be treated as a fatal bug! Any SPICE-specific stuff must be understood as something absolutely different from symbol graphical stuff (pins, lines, positions and colors).
If a field that is called Sim.Something is automatically messed-up by the schematic or the symbol editor, there will be zero chance to ever run simulations in KiCad.
1_Logic_Driver.7z (1.2 MB)
2_Logic_Driver.7z (1.2 MB)