CDF Parameter Position

Hi Newsgroup

I am a relatively new user of Composer and am struggling desperately to do
something quite basic.

I use a resistor from the analogLib and fill in the fields for ModelName,
Length and Width and want to display these field in the schematic. When I
enable the display option the fields appear in the schematic as expected.
I want to position the information below the reference designator instead
of above and to the left on the reference designator. How do I do this?

Thanks in advance.
JNB

 

Hi,

I suggest you to don't use the display option in the
CDF parameter section of the Edit Properties Form.

Rather than that, you can use the 'Component Display'.
This was renamed by Cadence, so it might be that in
older version it's called Label Display.
But for 4.4.6 and 5.0 go to 'Edit->Component Display...'.
Then select your instance.
In the form:
Select Label X parameters
Apply To X instance
X parameter
Display value only -> choose here model, w, and l.

You'll see the parameters will be displayed on the right
side of your resistor.
If you open the symbol cellview for the resistor you'll see
a label called cdsParam(n) these is the variable where you
params will be placed, so if you want an other location move these
variable, you must have write permission to analogLib.

I unfortunately do not know on which system layer the CDF Pramas will
be displayed if you use the display option in the Edit Properties Form.

Regards Bernd

 

Hi Bernd

Thank you what you described does the trick.

I seem to be on a roll here so let me try my luck once more.

How and where do I write the 'callback' to calculate the resistance
automatically from L & W.

Regards
JNB

 

This is not explained in brief, look in the docs for cdfgData or callback.
cdfgData is the global variable to get and set cdf params in SKILL
procedures.

e.g.

n_w = cdfgData->w->value
n_l = cdfgData->l->value

calculate r with n_w and n_l,
set r

cdfgData->r->value = n_r

But that's not that trivial, and maybe not that easy for
a beginner in Cadence DFII.

I'm on a jump because it Friday evening here in Europe.

Bernd

 

Thanks again. Again you provided enough information for to me to solve my
problem.

JNB