[PCB_FORUM] Re: CM delta:Tolerance

Mark,

I'm working with a Viewdraw front end.
One can load properties into Allegro with the netin feature and work with the
constraints in Excel or another spreadsheet.

On one design using a multi row connector
we compensated for the connector pin lengths to the mating
board.

Method :
1) find the longest net using Manhattan distance.
2) make the longest net the target ( see syntax below)
3) Adjust other nets in the plus or minus directions.
4) link to database using netin 3rd party.

In the below example CPO_A6 is the target ( longest forced to be target G:L:S::).
Second line is +.050 longer.
Third line is- .106 shorter
Fourth line is -.192 shorter
fifth line is .-238 shorter
Sixth line is the same length.

All have a tolerance of .012 off of the required length. All nets n the same relative
prop group.

$PACKAGES
$ADD
$PACKAGES
$NETS
$A_PROPERTIES

RELATIVE_PROPAGATION_DELAY 'CP_NPA:G:L:S::' ; 'CP0_A6'

RELATIVE_PROPAGATION_DELAY 'CP_NPA:G:L:S:050:12MIL' ; 'CP0_A5','CP1_A0',
RELATIVE_PROPAGATION_DELAY 'CP_NPA:G:L:S:-106:12MIL' ; 'CP0_A1','CP0_A2',
RELATIVE_PROPAGATION_DELAY 'CP_NPA:G:L:S:-194:12MIL' ; 'CP0_A0','CP1_A5',
RELATIVE_PROPAGATION_DELAY 'CP_NPA:G:L:S:-238:12MIL' ; 'CP2_A1','CP2_A2',
RELATIVE_PROPAGATION_DELAY 'CP_NPA:G:L:S:0:12MIL' ; 'CP1_A4','CP3_A0','CP4_A1',
$END


Hope this helps.

dave




Mark Salberg wrote:

Actually, I want 1500mil shorter than target as minimum length and target length as max.

I think I will use -750:750 suggested by Daniel so my actual target is in the middle of the spec.

Thanks for all the responses.

Mark

the specified nets to be matched to the taget length as a max and 1500mil shorter than the target as min.
Davies, Charles (cdavies) wrote:

Mark,

If you want the specified net to be 1500 mil shorter than the target,
you need to set the delta to -1500.  The tolerance is then applied to
the length.

Charlie -----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Salberg
Sent: Tuesday, January 31, 2006 3:38 PM
To: Cadence User Group
Subject: [PCB_FORUM] CM delta:Tolerance


Can anyone tell me the correct way to define a matched group in Constraint Manager?
I need to match a target to "same length as target" to "-1500mil of the target"?
I tried 0:-1500 for delta:tolerance, but it is not working right.

Thanks in advance,
Mark


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Catapult Communications Inc.
800 Perimeter Park Dr, Suite A
Morrisville, NC 27560

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