Problem with Pcell and its CDF

Hi,

    I tried to create a MOS transistor pcell using SKILL, and I had two problems with the pcell's CDF :

    I defined a Boolean parameter withTap in the pcell, and if withTap is true(t), then there will be taps in the layout of MOS transistor, vice versa.

    In the pcell.il file, I defined this parameter as below:

    (withTap t)

...

If(withTap then

    dbCreateRect(...)

    )

In the CDF file, I defined this parameter as below:

    cdfCreateParam( cdfId

        ?name           "withTap"

        ?prompt         "Include Taps?"

        ?defvalue       "t"

        ?type           "boolean"

        ?display        "t"

    )

But when I create instance with Edit Instance Property form, I found that it failed to response to this switch as if it failed to pass the value from the form to pcell layout.

Then I tried to define withTap as int, it worked this time.

Are there anything wrong with my definition of this parameter? Although it works with integer type as well, I still prefer it to be Boolean type.

The other problem is with my instantiation instances.

It is weird that when I try to instantiate an instance of this pcell, it still keeps the value of last instance. It seems that it stores its values every time I create an instance. Thus, I have to press Default button when I create a new instance using this pcell, and it is not quite convenient.

Is there any other way to solve this problem?

Any suggestions to solve this problem.

Thanks in advence

Renee