[PCB_FORUM] Re: XNet dilemma
- From: Dave Seymour <dseymour@xxxxxxxxxxx>
- To: "icu-pcb-forum@xxxxxxxxxxxxx" <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 6 Oct 2010 15:07:58 -0700
Gary,
That's different.
If one assigns the Voltage Property to the PWR/GND nets (P3V3VDC in this case)
then the Xnet understands the discrete is really and termination and won't form
the Xnet.
Edit > Properties > (find filter set to "Nets") > Voltage = 3.3v, GND = 0V
Dave
Dave Seymour
Ixia
www.ixiacom.com<http://www.ixiacom.com>
919.267.4840
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Wednesday, October 06, 2010 5:45 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: XNet dilemma
Well, the net "P3V3VDC" is a member of the XNet "EEPROM_WP" for one example
(3.3V & EEPROM write protect?).
I don't think there is a reason to have xnets setup at all.
I like to put the property Ratsnest_Schedule = Power_And_Ground on my power and
gnd nets so that the rats look like this:
[cid:image001.jpg@01CB6581.67FF9220]
Instead of the rats going all over the place (yeah, I don't like filled pads
either!).
Regards,
Gary MacIndoe
Senior PCB Layout Designer
Contract - Kelly Services
Covidien
EbD R&D
5920 Longbow Drive
Boulder, CO 80301
303.476.7458
www.covidien.com
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Shaw, Christopher
Sent: Wednesday, October 06, 2010 3:28 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: XNet dilemma
But what do you mean exactly by 'should not be there'?
Chris
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Dave Seymour
Sent: Wednesday, October 06, 2010 4:25 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: XNet dilemma
Edit> Properties (find filter set to Comps) > No_Xnet_Connection
Or
Specifically, remove the model from the component.
Analyze > Model Assignment > Select the part and clear the model. ( this will
come back if you reassign all models or auto assign)
Hope this helps.
Dave
Dave Seymour
Ixia
www.ixiacom.com<http://www.ixiacom.com>
919.267.4840
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Wednesday, October 06, 2010 5:17 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] XNet dilemma
Hey guys,
I have some XNets in my design that should not be there.
I asked the DE and he said that he didn't add them in the schematic (he doesn't
even know about them).
Does anyone know if there is a way to remove them in Allegro?
Thanks for any help.
Regards,
Gary MacIndoe
Senior PCB Layout Designer
Contract - Kelly Services
Covidien
EbD R&D
5920 Longbow Drive
Boulder, CO 80301
303.476.7458
www.covidien.com
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