[PCB_FORUM] Re: Prop Delay not seeing all the net

  • From: Julian Ungureanu <jungurea@xxxxxxxxx>
  • To: icu-pcb-forum@xxxxxxxxxxxxx
  • Date: Wed, 02 Mar 2005 15:08:18 -0800

Dave,
It looks like a scheduling type problem.
You have a connector (in between the R and U maybe?) and I believe that All Drivers:AllReceivers
is not working right. You could specify the length from each pin of the net to the other or
create a topology template.

Thanks,
Julian

Dave Seymour wrote:

15.2

Anyone know why a DRC is generated when the entire
net length is correct?

The net length is supposed to be between 2000 and 2500 mils.

Probing the net gives --->Total Etch Length: 2280.31 MIL. Very good.

When the DRC is probed, only a portion of the net is reported.
Actual value:     1032.65 MIL
Very Bad.

What up with that?

I did check the box for in the user setup for pre 11.x checking.

Thanks for the help.
dave

LISTING: 1 element(s)

             < NET >

 Net Name:       CPU_CLK6

 Via Count:              3
 Total Etch Length:      2280.31 MIL
 Total Manhattan Length: 2257.7 MIL
 Percent Manhattan:      101.00%

 Pin                     Type      SigNoise Model
 ---                     ----      --------------
 R93.2                   BI        CDSDefaultIO
 J5.A13                  BI        CDSDefaultIO
 U4.27                   IN        CDSDefaultInput

 No connections remaining

 Properties attached to net
   CLASS             = CPU_CLK
   NET_SPACING_TYPE  = CLOCK
   NO_GLOSS
   MANUAL_ROUTES
   PROPAGATION_DELAY = AD:AR:2000 MIL:2500 MIL



LISTING: 1 element(s)

          < DRC ERROR >

 Class:           DRC ERROR CLASS
 Subclass:        ALL
 Origin xy:       (2083.30 -790.00)

 CONSTRAINT:      Propagation Delay
 CONSTRAINT SET:  PROPAGATION_DELAY
 CONSTRAINT TYPE: ATTRIBUTE
   Constraint value: AD:AR:2000 MIL:2500 MIL
   Actual value:     1032.65 MIL




--
Thanks,
Julian Ungureanu -------------------------
CAD Applications Engineer,
Cisco Systems, Inc.
Phone : (408) 853-2178
Pager : (408) 951-2594
Fax : (408) 853-3531
E-page : jungurea@xxxxxxxxxxxxxxx
E-mail : jungurea@xxxxxxxxx
-------------------------

"Opinions expressed are strictly my own and not necessarily those of Cisco Systems, Inc."


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