I find that the biggest time killer are polygon planes. For this reason, I only fill
the polygons after everything else is done. Especially with a slow CPU.
If you have polygon fills, try temporarily deleting them and run the DRC again.
_____________
Brian Guralnick
----- Original Message -----
From: "Phil So" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, June 07, 2001 7:31 PM
Subject: [PEDA] DRC run times
| Hello
|
| Does anyone know what factors affect how long the DRC in the PCB Editor
| takes to run?
|
| I have a design where I have reviewed the clearance rules and netclasses. A
| copy of the ddb file of the Rev. A design was made and renamed to be the
| Rev. B design. The new rules were created in EXCEL, massaged with a text
| editor and imported into the Rev. B design.
|
| It took 22 min, 16 sec. for the DRC to finish on the Rev. A design. It took
| 10 sec. for the DRC to finish on the Rev. B design.
|
| The Rev. A design has 19 netclasses and 40 clearance rules. The Rev. B
| design has 13 netclasses and 36 clearance rules. The new clearance rules
| cover more "interactions" between the various nets. The new clearance rules
| also do not have any overlap where the clearance between two nets is defined
| by up to 4 different rules. The rules set the clearances to 0.25mm, 1.5mm,
| 2.3mm, 3.0mm, 4.5mm and 5.5mm. Yes, lots of high voltages on this board.
|
| The design has 37 nets, 76 components and 212 pads and vias on it. All the
| components are passive's. The only differences between the layout of the
| Rev. B design and that of the Rev. A design is that about 6 tracks were
| moved slightly or narrowed slightly to get rid of some DRC violations due to
| the new clearance rules.
|
| I am using PROTEL 99SE SP3 on a 233 MHz PII with 64 MB or RAM, and NT SP4.
|
| Thanks in advance.
|
| Regards,
|
| Philip So
| Electronics Design Engineer
| PDL Electronics Ltd
| 81 Austin Street
| Napier
| New Zealand
|
| Phone :++64 6 843 5855 ext. 7152
| Fax :++64 6 843 0603
| E-mail :[EMAIL PROTECTED]
|
| Visit our website: http://www.pdl.co.nz
|
|
| The contents of this E-mail may contain information that is legally
| privileged and/or confidential to the named recipient. This information is
| not to be used by any other person and/or organisation. The views expressed
| in this document do not necessarily reflect those of the company.
|
|
|
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