Stats

  • Locked Locked
  • Replies 4
  • Subscribers 125
  • Views 17475
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

spectre save statements

MarkSummers

Is there any comprehensive documentation spectre save statements.  I may be missing something, but I do not find all the info in spectre -h save.  

Specifically some explanation on wildcards and also all the different thigs that can be saved.

 I also found that the subckt paramater did not work as I expected.  If I have block C instantiated in block B which is instantiated in Block A.   Block C has pins VDD, GND, INPUT, and OUTPUT.  VDD and GND are signals that exist at the top-level Block A.  They follow the heiarchy down to connect to block C.  If I use the following statement it does not seem to work

save VDD subckt=C

 I assume this is because VDD is a net on a higher level.  I would hope this save statement would work, since it would make it easy to save all VDD nodes connected to instantiations of C without having to know what they are called.  This would be consistent with assertion syntax.

Finally, if I use asserts do I have to explicitly save the nodes I use for assertions(In tran analysis).  It looked to me like it worked without this.  Do nodes/currents called by assertions get automatically saved. This would be a nice feature.

FYI I am using spectre 7.1.1.221

Parents

  •  I did some experiments and it seems that nodes( I actually checked currents) are saved for assert calculations.  I used assertions to check for max and average currents when I had nothing saved in the schematic.  I saved no voltages and no currents.  The calculations reported back values that was consistent when currents were saved and when they were not.  If this is a built in feature, it is a good one and something that should be advertised.

    Confirmation of this and any info on my other questions would be appreciated.

Reply

  •  I did some experiments and it seems that nodes( I actually checked currents) are saved for assert calculations.  I used assertions to check for max and average currents when I had nothing saved in the schematic.  I saved no voltages and no currents.  The calculations reported back values that was consistent when currents were saved and when they were not.  If this is a built in feature, it is a good one and something that should be advertised.

    Confirmation of this and any info on my other questions would be appreciated.

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.