Restarting a Cadence Simulation

[Sid]

Hi,

I am using the "check-point" feature within Analog Design Environment
(ADE) to allow me to restart my Spectre transient simulations (which
run for several days) if they stop due to some form of system crash.


Details of what I do:
------------------------

For this I set "create check-point file" under
"set-up->Environment" in ADE. I also mention in the
"analysis->choose->transient->options" form the value of
"ckptperiod" (i.e. check-point period = 20 ns, say).

Cadence then creates a "check point file" even 20 ns of my transient
simulation. Hence, if my system crashes at say t = 125 ns, I will be
able to restart the simulation from t = 120 ns. To restart from 120
ns I check the box "set-up->environment->start from check-point
file" before restarting the simulation.

Here is MY PROBLEM:
-------------------------
When I view the waveforms after a RE-STARTED simulation completes, I
DO NOT SEE THE WAVEFORMS for the time before the crash. For example,
if my simulation crashed (or was stopped) at 125 ns, and Cadence
starts the RE-STARTED simulation from t = 120 ns, I do NOT see
waveform data for 0-120 ns. However, I see waveform data for all
signals from t=120 ns! How do I fix this?

I have tried playing with both "session->save-state" and
"results->save" in ADE, but to no use. Any help will be greatly
appreciated.

Thanks,
Sid

 

[Andrew Beckett]

On Sat, 16 Apr 2005 04:35:16 -0500, sid.dev@gmail-dot-com.no-spam.invalid
(Sid) wrote:

Hi,

I am using the "check-point" feature within Analog Design Environment
(ADE) to allow me to restart my Spectre transient simulations (which
run for several days) if they stop due to some form of system crash.


Details of what I do:
------------------------

For this I set "create check-point file" under
"set-up->Environment" in ADE. I also mention in the
"analysis->choose->transient->options" form the value of
"ckptperiod" (i.e. check-point period = 20 ns, say).

Cadence then creates a "check point file" even 20 ns of my transient
simulation. Hence, if my system crashes at say t = 125 ns, I will be
able to restart the simulation from t = 120 ns. To restart from 120
ns I check the box "set-up->environment->start from check-point
file" before restarting the simulation.

Here is MY PROBLEM:
-------------------------
When I view the waveforms after a RE-STARTED simulation completes, I
DO NOT SEE THE WAVEFORMS for the time before the crash. For example,
if my simulation crashed (or was stopped) at 125 ns, and Cadence
starts the RE-STARTED simulation from t = 120 ns, I do NOT see
waveform data for 0-120 ns. However, I see waveform data for all
signals from t=120 ns! How do I fix this?

I have tried playing with both "session->save-state" and
"results->save" in ADE, but to no use. Any help will be greatly
appreciated.

Thanks,
Sid

I answered the same question posted on the designer's guide site:

http://www.designers-guide.org/Forum/?board=circuit;action=display;num=1113770338

to save re-posting here.

Andrew.