how to find/save PCELL CREATION TIME ? / How to solve this

V

vivek

Guest
Hi
I want to modify some pcell's default parameters (eg : well
enclosure of diffusion) in a skill based pcell . But i dont want
already created pcells to be updated/evaluated with the new parameter
when i open it .

I have defined my parameters in the device declaration section
of the technology file. I am using IC.6.1.3.1.500.

Is there any way where we can get the time when the pcell was
created ?.If it is possible , by comparing that time with the
reference time i can decide which rule has to be taken for a
particular enclosure (eg : well enclosure of diffusion) or any thing.
So my old pcells remain unaffected whereas my new pcells follow the
new rules.

OR

Is there a way to save the time of pcell creation (Not
evaluation) as a pcell parameter while creating the pcell only . If
it is possible then all my old pcells will have the default time & by
comparing that time with the reference time i can go ahead .

"THANKS IN
ADVANCE"

Anticipating your reply,
vivek.
 
vivek wrote, on 06/09/10 10:18:
Hi
I want to modify some pcell's default parameters (eg : well
enclosure of diffusion) in a skill based pcell . But i dont want
already created pcells to be updated/evaluated with the new parameter
when i open it .

I have defined my parameters in the device declaration section
of the technology file. I am using IC.6.1.3.1.500.

Is there any way where we can get the time when the pcell was
created ?.If it is possible , by comparing that time with the
reference time i can decide which rule has to be taken for a
particular enclosure (eg : well enclosure of diffusion) or any thing.
So my old pcells remain unaffected whereas my new pcells follow the
new rules.

OR

Is there a way to save the time of pcell creation (Not
evaluation) as a pcell parameter while creating the pcell only . If
it is possible then all my old pcells will have the default time& by
comparing that time with the reference time i can go ahead .

"THANKS IN
ADVANCE"

Anticipating your reply,
vivek.
Click to expand...
Hi Vivek,

Just catching up. This was **URGENT** a month ago, so this may be way too late
for you.

I'm assuming you're trying to find the date that the pcell instance was created
- if that, then that doesn't exist. I don't think the date that the pcell itself
was created is terribly helpful in this case.

One way to do this is to have a pcell parameter called (say) "version" with a
default value of 1. Then create a CDF parameter called "version" with a default
value of 2 and storeDefault=yes.

This will be slightly misleading because if you query existing components
they'll show as version 2 (because they don't have a value on the instance), but
in practice they really have a value of 1 as far as the pcell is concerned.

This tends to work best if you've anticipated it up front, because then each and
every instance has an appropriate "version" property stored on it. You could
retrofit it with some SKILL code to hunt around for every instance which doesn't
have an instsance property "version", and then set it to 1. This isn't really
necessary to get it to do what you want, but would be less confusing for the user...

Then your pcell code can simply look at the "version" parameter and do whatever
version-specific thing you want.

Regards,

Andrew.
 
On Jul 12, 9:32 pm, Andrew Beckett <andr...@DcEaLdEeTnEcTe.HcIoSm>
wrote:
vivekwrote, on 06/09/10 10:18:



Hi
I want to modify some pcell's default parameters (eg : well
enclosure of diffusion) in a skill based pcell . But i dont want
already created pcells to be updated/evaluated with the new parameter
when i open it .

I have defined my parameters in the device declaration section
of the technology file. I am using IC.6.1.3.1.500.

Is there any way where we can get the time when the pcell was
created ?.If it is possible , by comparing that time with the
reference time i can decide which rule has to be taken for a
particular enclosure (eg : well enclosure of diffusion) or any thing.
So my old pcells remain unaffected whereas my new pcells follow the
new rules.

OR

Is there a way to save the time of pcell creation (Not
evaluation) as a pcell parameter while creating the pcell only . If
it is possible then all my old pcells will have the default time& by
comparing that time with the reference time i can go ahead .

"THANKS IN
ADVANCE"

Anticipating your reply,
vivek.

HiVivek,

Just catching up. This was **URGENT** a month ago, so this may be way too late
for you.

I'm assuming you're trying to find the date that the pcell instance was created
- if that, then that doesn't exist. I don't think the date that the pcell itself
was created is terribly helpful in this case.

One way to do this is to have a pcell parameter called (say) "version" with a
default value of 1. Then create a CDF parameter called "version" with a default
value of 2 and storeDefault=yes.

This will be slightly misleading because if you query existing components
they'll show as version 2 (because they don't have a value on the instance), but
in practice they really have a value of 1 as far as the pcell is concerned.

This tends to work best if you've anticipated it up front, because then each and
every instance has an appropriate "version" property stored on it. You could
retrofit it with some SKILL code to hunt around for every instance which doesn't
have an instsance property "version", and then set it to 1. This isn't really
necessary to get it to do what you want, but would be less confusing for the user...

Then your pcell code can simply look at the "version" parameter and do whatever
version-specific thing you want.

Regards,

Andrew.
Click to expand...
Dear Andrew,
Thanks a lot for your reply .
I too thought of doing something like this (storing pcell Time Stamp
as a pcell parameter controlled by another variable like version),
but since we couldn't find time , we fixed by creating new pcells.

Thanks again...
vivek.
 
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