| |
|
|
 |
Many of you already received communications about the move of the Cadence user community into cadence.com. And many of you have already joined, with over 4000 registrations in the first two weeks.The new Cadence Community enhances the ability of Cadence users to connect and collaborate. In addition to moving the community into cadence.com -- enabling single sign-on for community, Sourcelink and Cadence events -- the new site is organized around nine technology segments, giving you easy access to product information, training, forums and blogs. Some of the new features include: - Ability to respond to posts via e-mail
- Technology-specific blogs
- Latest Web 2.0 social networking capabilities
- Public profile options
- Private messaging
- Friends lists
Visit the new Cadence Community today at www.cadence.com/community and join the discussions! Registration note: Due to the scope of the enhancements and the new SSO registration system, we were not able to migrate existing cdnusers.org member accounts. So new registrations are required, but this enables a broader set of functionality we think you'll enjoy. Forum note: Under the guidance of forum moderators, we have taken the 20+ cdnusers.org forums and consolidated them into 11 forums on the new site. Posts have been brought over so you can leverage that posting history. CDNusers forums will be set to read only starting 7/30, and cdnusers.org will be redirected to the new community on 8/4.Best regards, Mike and Tom Michael A. Catrambone - Steering Committee Chairman Distinguished Engineer PCB/Mechanical UTStarcom, Inc. Tom Diederich Cadence Community Manager
|
|
|
| Home |
 |
|
|
|
|
|
Posting to forums is available to community members only. Login or Register |
|
| Author |
Messages |
|
eminemshow
Posts: 75
Online: 
 |
| 1/30/2008 2:58 AM |
|
Hi ALL:
I have 2 questions:
1. I try to use readgds command to read GDSII file as cdump file, and then using cdump2lef covert cdump to LEF, I got stucked and found that the cdump file is correct, but the generated LEF is wrong.......is cdump2lef having bugs? I am using SOCE52USR3.
2. When I am running CeltIC, I find the 'set_parm gtol' parameter, this gtol means the filter criteria for aggressors, means glitch tolerance. But I also find 'set_thresh -glitch_peak' can also set such criteria, gtol default is 5% of VDD and glitch_peak is 20% of VDD, what is the difference? Can anybody tell me?
thank! |
|
|
|
BobD
Posts: 80
Online:
|
| 1/30/2008 7:56 AM |
|
Hi eminemshow,
Regarding question #1, readgds and cdump2lef are no longer supported. The recommended way of creating a LEF MACRO from gds is to use the abstract generator which is part of the Virtuoso platform.
For question #2, I don't know right off personally but hopefully a CeltIC expert can chime in.
Thanks,
Bob
|
|
|
|
trishak
Posts: 2
Online:
|
| 1/30/2008 11:05 AM |
|
Hi eminemshow,
For #2:
gtol is the glitch tolerance of a single attacker. This variable to
used to determine if an attacker can be an individual attacker or if it
should be grouped into the virtual attacker.
-glitch_peak is applied to the combined effect of all the attackers on a
net. If all the attackers that can attack can create more than the
glitch_peak value amount of noise, then the net is analyzed in more
detail for glitch. When a net is analyzed in more detail, it means that
the distributed RCs are used as well as a receiver peak analysis may
happen.
thank you,
Trisha |
|
|
|
eminemshow
Posts: 75
Online:
|
| 1/30/2008 5:42 PM |
|
Posted By trishak on 1/30/2008 11:05 AM
Hi eminemshow,
For #2:
gtol is the glitch tolerance of a single attacker. This variable to
used to determine if an attacker can be an individual attacker or if it
should be grouped into the virtual attacker.
-glitch_peak is applied to the combined effect of all the attackers on a
net. If all the attackers that can attack can create more than the
glitch_peak value amount of noise, then the net is analyzed in more
detail for glitch. When a net is analyzed in more detail, it means that
the distributed RCs are used as well as a receiver peak analysis may
happen.
thank you,
Trisha Glitch tolerance is the criteria for a single aggressor, glitch peak is for total effects of multi aggressors. Will CeltIC ignore the effect of multi aggressors on delta delay (and glitch) at all if their total glitch is below '-glitch_peak'? or just dont make a detail analysis and make a rough calculation instead? Hopes that my points are clear. This is very important for make a correlation between CeltIC and PT.
|
|
|
|
eminemshow
Posts: 75
Online:
|
| 1/30/2008 6:29 PM |
|
Posted By BobD on 1/30/2008 7:56 AM
Hi eminemshow,
Regarding question #1, readgds and cdump2lef are no longer supported. The recommended way of creating a LEF MACRO from gds is to use the abstract generator which is part of the Virtuoso platform.
For question #2, I don't know right off personally but hopefully a CeltIC expert can chime in.
Thanks,
Bob
Thanks! bob, I will try to use abstract gen. Maybe later I will have questions about it.
|
|
|
|
eminemshow
Posts: 75
Online:
|
| 1/31/2008 7:02 PM |
|
Posted By eminemshow on 1/30/2008 5:42 PM
Posted By trishak on 1/30/2008 11:05 AM
Hi eminemshow,
For #2:
gtol is the glitch tolerance of a single attacker. This variable to
used to determine if an attacker can be an individual attacker or if it
should be grouped into the virtual attacker.
-glitch_peak is applied to the combined effect of all the attackers on a
net. If all the attackers that can attack can create more than the
glitch_peak value amount of noise, then the net is analyzed in more
detail for glitch. When a net is analyzed in more detail, it means that
the distributed RCs are used as well as a receiver peak analysis may
happen.
thank you,
Trisha Glitch tolerance is the criteria for a single aggressor, glitch peak is for total effects of multi aggressors. Will CeltIC ignore the effect of multi aggressors on delta delay (and glitch) at all if their total glitch is below '-glitch_peak'? or just dont make a detail analysis and make a rough calculation instead? Hopes that my points are clear. This is very important for make a correlation between CeltIC and PT.
I need the answer, really! |
|
|
|
trishak
Posts: 2
Online:
|
| 2/07/2008 7:03 AM |
|
| The glitch analysis and delta delay analysis criteria are separate. For delta delay analysis, you should use the set_thresh -delta_absolute command/option. This allows you to put a delta delay value as the criteria for the delta delay analysis. For instance, if you want to analyze all nets with delta delays larger than 5ps, then you would do: set_thresh -delta_absolute 5e-12. For glitch, using -glitch_peak is correct and any glitch less than -glitch_peak will not be analyzed in detail.
You have a lot of very good questions about CeltIC. You might consider taking a CeltIC training class as these details are discussed in the CeltIC training class in more detail than can be easily written in this forum.
thank you,
Trisha |
|
|
|
eminemshow
Posts: 75
Online:
|
| 2/11/2008 8:38 PM |
|
Posted By trishak on 2/07/2008 7:03 AM
The glitch analysis and delta delay analysis criteria are separate. For delta delay analysis, you should use the set_thresh -delta_absolute command/option. This allows you to put a delta delay value as the criteria for the delta delay analysis. For instance, if you want to analyze all nets with delta delays larger than 5ps, then you would do: set_thresh -delta_absolute 5e-12. For glitch, using -glitch_peak is correct and any glitch less than -glitch_peak will not be analyzed in detail. You have a lot of very good questions about CeltIC. You might consider taking a CeltIC training class as these details are discussed in the CeltIC training class in more detail than can be easily written in this forum. thank you, Trisha
Thanks! Trisha, I will consider this.
|
|
|
|
|
Posting to forums is available to community members only.
Login or Register |
|
|
|
ActiveForums 3.6
|
|
|
|
|
| |
|
|
|