linking cdf params and spectre netlist

K

kev

Guest
Hi,

I am trying to simulate some standard cells from ARM. All they have
provided are the backend views without schematic [as they do not
support this and neither do tsmc]. tech is tsmc 0.18um
I have the symbols, I have the cdl netlist for the standard cell lib.
So being a typical engineer, I try to simulate only an inverter - I
mean how hard can it be!
Only it doesn't invert!the output is not the same as the input - there
seems to be some cap loading but otherwise I ahve a nice buffer with
the invx1 cell! [At least it is netlisting and simulating .... ;-) )

I have done the following:
1. converted the netlist to spectre format and cahnegd the model names
to pch and nch.

simulator lang=spectre
subckt INVX1 Y A
M0 ( Y A VSS VSS ) nch l=0.18u w=0.6u
M1 ( VDD A Y VDD ) pch l=0.18u w=0.9u
ends INVX1

2. copied the symbol view a spectre view [doesn't seem to simulate
otherwise]

3. Edited the base cdf parameters.
i.e. simulation info - spectre

componentName = INVX1
termOrder = "Y" "A"

Is there something else I need to add/edit? [obviously there is...]

Could someone please shed some light on this for me.....

regards
Kevin
 
Ok, I have added VDD and VSS pins and now my inverter works!
So how does one pass globals correctly?

Previously I added a netset property VDD=vdda VSS=vssa where vdda and
vssa were
wires on my testbench.


kev wrote:

Hi,

I am trying to simulate some standard cells from ARM. All they have
provided are the backend views without schematic [as they do not
support this and neither do tsmc]. tech is tsmc 0.18um
I have the symbols, I have the cdl netlist for the standard cell lib.
So being a typical engineer, I try to simulate only an inverter - I
mean how hard can it be!
Only it doesn't invert!the output is not the same as the input - there
seems to be some cap loading but otherwise I ahve a nice buffer with
the invx1 cell! [At least it is netlisting and simulating .... ;-) )

I have done the following:
1. converted the netlist to spectre format and cahnegd the model names
to pch and nch.

simulator lang=spectre
subckt INVX1 Y A
M0 ( Y A VSS VSS ) nch l=0.18u w=0.6u
M1 ( VDD A Y VDD ) pch l=0.18u w=0.9u
ends INVX1

2. copied the symbol view a spectre view [doesn't seem to simulate
otherwise]

3. Edited the base cdf parameters.
i.e. simulation info - spectre

componentName = INVX1
termOrder = "Y" "A"

Is there something else I need to add/edit? [obviously there is...]

Could someone please shed some light on this for me.....

regards
Kevin
Click to expand...
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top