[PCB_FORUM] Re: question about connecting two nets together.

Hi Satich!
 
Thank you for your document!
I tried it in the current design, but I failed to get it OK;-(
 
As I wrote earlier, I am quite new to orcad.
I m not all that amiliar with all the slang in orcad, and english is not my
native tongue.
 
I try to explan what I did.
 
In the design I have to update alle the DRC's where switched of so I had a
lot of cleaning to do.
Now I am stuk with 42 errorts all related to the STR component they used to
seperate grounds and power circuits.
These are all route spacing and pad to pad spacing errors in the
spreadsheet.
 
The STR componen has 2 pads for connecting signals in the schematic ( Just
like a resistor would have.)
In the layout they mage a footprint with two overlapping pads for the
connection.
 
Now In the shematic:
Pin 1 of the STR component is connected to 5V
Pin 2 of the STR component is connected to SUPA
 
Il the properties of the signal SUPA, I created the property 

NET_SHORT

with the value 
5V:SUPA
 
I re-generated the netlist with ECO on.
and in orcad PCB I got the popup that the design had changed.
I accepted the changes and ran the DRC check.
The errors where still the same. 42
 
Now I editted this footprint for this one component with the pin tool so the
pads where seperated.
 
Now the number of errors decreased to:  33
 
I connected the two pads (signals) wit the add/edit route mode.
an ran the DRC check again.  Now it was 42 errors again.
Where did I do wrong?
 
Thanks for helpin me!
 
BeB
 
 
 

-----Original Message-----
From: k.satish@xxxxxxxxx [mailto:k.satish@xxxxxxxxx]
Sent: donderdag 22 juli 2004 6:12
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: question about connecting two nets together.


Hi,
I hope this attachment will help you in connecting two nets together.
Rd,
K. Satish

-----Original Message-----
From: Gerry Meier [mailto:gerry.meier@xxxxxxxxxxxxxx] 
Sent: Thursday, July 22, 2004 1:47 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: question about connecting two nets together.


Jim,
 
If you use this method be sure to note the short when you send the board to
be fabricated. Valor or other CAM DFM tool will find it as a short.
You can also use the pin property  NET_SHORT with the "value" name of the
nets you are shorting "gnd:agnd". You may have to play with the order of the
nets "agnd:gnd" it is rather picky. 
 
The benefit is that when you then go to generate your IPC-356 netlist it
adds the shorted nets information in. (It is in commented) I will usually
just copy and paste this into my readme file.
 
Try it out it is slick!,
Gerry

-----Original Message-----
From: J Wages [mailto:jwages@xxxxxxxxx]
Sent: Wednesday, July 21, 2004 4:46 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: question aobout connecting two nets toghetter.



Nice!

 

Jim S. Wages / Independent SR. PCB Layout Designer:  

(919) 484-2963

-----Original Message-----
From: Tony Stanislao [mailto:stanislao_t@xxxxxxxxxxxx] 
Sent: Wednesday, July 21, 2004 7:43 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: question aobout connecting two nets toghetter.

 

Its easy, go to setup>constraints. At the bottom is constraint areas, click
add and draw a hollow shape around your 2 pin device on Board
Geometry>constraint_area layer. Add A Net_Spacing Property to the shape
called PIN2PIN or whatever you like. Add a New constraint to the spacing
rules set called the same name with a smd to smd spacing of -1. Also go into
your assignment table and set that up. The drc will go away and you have two
nets tied together.

 

Hope this helped.

 

Tony Stanislao, Senior PCB Design Engineer
Pannaway Technologies | v: 603.766.5129| e: stanislao_t@xxxxxxxxxxxx
<mailto:%20stanislao_t@xxxxxxxxxxxx> 

========================================= 

 

-----Original Message-----
From: Hennink, Beb [mailto:bhennink@xxxxxxxxxxxxxxx] 
Sent: Wednesday, July 21, 2004 3:45 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: question aobout connecting two nets toghetter.

 

Thanks tony I wil try,

A question about your answer/.

 

How du you create a pin2pin constraint area?

I cannot find it  in the doc file I have on this PC :-S

 

BeB

 

 

-----Original Message-----
From: Tony Stanislao [mailto:stanislao_t@xxxxxxxxxxxx]
Sent: dinsdag 20 juli 2004 22:59
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: question aobout connecting two nets toghetter.

I had a similar situation to yours. I created a small footprint with 2
paddle shaped pads which overlapped to make a connection. I got a smd pin
to smd pin drc and I used a pin2pin constraint area to fix. I allowed a -1
spacing between the pins in this constraint area. I hope this helped.

 

Tony Stanislao, Senior PCB Design Engineer
Pannaway Technologies | v: 603.766.5129| e: stanislao_t@xxxxxxxxxxxx
<mailto:%20stanislao_t@xxxxxxxxxxxx> 

========================================= 

 

-----Original Message-----
From: Hennink, Beb [mailto:bhennink@xxxxxxxxxxxxxxx] 
Sent: Tuesday, July 20, 2004 11:08 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] question aobout connecting two nets toghetter.

 

Hi 

 

I am working with orcad 10 (cadence 15?) so I hope my questions are OK here?

I read this list for some time and last week but I nere was able to post a
message from my lycos account. I am glad this mailadrres gets trough.

 

I am quite new to orcad layout myself so maybee this question is easy to
aswer?

 

What I want to do is the following.

 

A have signals/nets in my schemaic that I only want to connect together at
one singel point.

An example: (Analog ground and Digital ground  )

 

 

Another example  (+5V digital, +5V analog)

 

In the past I solved this by placing a 0 ohm resistor in the schematic
connnecting the two nets togetter.

Because these resistors must be placed and ofcourse cost money I looked for
a better way.

 

I created a schematic symbol for a stripline component and atached a very
small footprint containing two pads close togetther and some copperpour
connecting those two pads.

Now if ik place this components it indeed connect the two nets but also
generate a lot of DRC errors.

 

Object overlap, routespacing padspacing errors.

 

 

Is there anyway to do this in a way That i can do this without creating
those error messages?

 

I hope somewone can help

 

BeB

 

 

 

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