Lost Consistency

Hi Jorge,

Thanks for getting back to me.

Regarding your feedback, I understand your guidance. However, can I provide

another example of my Lost Consistency problem, to aid more understanding.

I have a 4 pin single inline connector directly connected to a 64 pin

backplane connector, (I only tell you this so that you understand it is a

simple direct connection).

Again no matter if I delete all 4 nets and then add new nets, no matter if I

delete 4 pin connector, from schematic and PCB and then add new connector, I

get the Consistancy error "Different connections on SV10 pin 1 and pad 1

(10RX1+ / none"

SV10 = 4 pin connector

10RX1+ = net name on pin 1

For this connector and with the remaining 3 pins of the connector, I get the

same error. This error type is the same or similar for a further 79 error

instances in my design.

My PCB has been tracked a great deal so deleting all tracks as you

previously suggested is not a good option for me.

I have checked that there are no such things as missing parts etc between

schematic and PCB. Also to point out, there are some devices which have air

wires attached to some pins while not being attached to other pins on the

same device.

Is there another way to achieve consistancy?

The option you previuosly stated seems a bit of sledge hammer to crack a

nut.  I'm also perplexed as to how this consitancy issue has arose since I

always close both PCB and Schematic by closing Control Panel, and I never

work with either the schematic or board open individually - they are always

open as a pair and closed as a pair.

Anyway I hope this provides a greater picture as to my problem, hope you can

help.

Many thanks.

Jim

"Jim D" <j.doyle@optosci.com> wrote in message

news:il31ir$4g5$1@cheetah.cadsoft.de...

Hi,

 

I wonder if any one provide assistance.  I have lost consistency on my

board.  I have tried various methods to fix but without success.  I have

run ERC and identified say this error below:

 

"Different connections in IC2B pin OE and pad 4 (GND/ none)"

I interpret this to mean there is a net connection on GND but NOT on pin

OE. However there is deffinately a net connection in my schematic as I can

move the GND symbol or my device (74HCT125D) symbol and see that the net

is connected to both device and ground.

I have also tried deleting devices and nets and added new devices from

library, with no success.  I have also deleted nets and renamed there

another name and still no success.

 

How can I fix this ?

 

Many thanks,

Jim

 

"Jim D" <j.doyle@optosci.com> wrote in message

news:il4vih$fdo$1@cheetah.cadsoft.de...

Is there another way to achieve consistancy?

The simplest way is to delete all nets to the conflicting pins both in sch

and brd. In sch its easy.

In brd you need to get an airwire to the pin only before you delete it.

-If there is a wire going to the pad, start by deleting that.

-Do ratsnest

-Llook for an airwire. Make sure there is just ONE airwire going to the pad.

If you get two, you will have more problems after deleting them because you

will split a net into two different net names. To fix that, do a temporary

route around the pin (doesnt matter if you overlap) and do ratsnest again.

Note, if the pin is surrounded by filled polygons, you should temporary

rename the polygon to something else and redo ratsnest.

-When you got one airwire to the pad, delete THE AIRWIRE.

-Redo temporary changes 

-Now try ERC again.

On 03/08/2011 01:12 PM, Morten Leikvoll wrote:

"Jim D" <j.doyle@optosci.com> wrote in message

news:il4vih$fdo$1@cheetah.cadsoft.de...

>> Is there another way to achieve consistancy?

 

The simplest way is to delete all nets to the conflicting pins both in sch

and brd. In sch its easy.

 

In brd you need to get an airwire to the pin only before you delete it.

-If there is a wire going to the pad, start by deleting that.

-Do ratsnest

-Llook for an airwire. Make sure there is just ONE airwire going to the pad.

If you get two, you will have more problems after deleting them because you

will split a net into two different net names. To fix that, do a temporary

route around the pin (doesnt matter if you overlap) and do ratsnest again.

Note, if the pin is surrounded by filled polygons, you should temporary

rename the polygon to something else and redo ratsnest.

-When you got one airwire to the pad, delete THE AIRWIRE.

-Redo temporary changes 

-Now try ERC again.

 

 

After removing erroneous nets, you must run ERC again for the brd and

sch to become consistent again BEFORE you reconnect what once was

removed. As long as there is an inconsistency noting you do in sch will

end up in brd.

1) Remove

2) ERC

3) Repeat 1) and 2) until consistency has been achieved

4) Add what was once removed.

5) Celebrate

Breg

Vidar(Z)

On 03/08/2011 01:12 PM, Morten Leikvoll wrote:

"Jim D" <j.doyle@optosci.com> wrote in message

news:il4vih$fdo$1@cheetah.cadsoft.de...

>> Is there another way to achieve consistancy?

 

The simplest way is to delete all nets to the conflicting pins both in sch

and brd. In sch its easy.

 

In brd you need to get an airwire to the pin only before you delete it.

-If there is a wire going to the pad, start by deleting that.

-Do ratsnest

-Llook for an airwire. Make sure there is just ONE airwire going to the pad.

If you get two, you will have more problems after deleting them because you

will split a net into two different net names. To fix that, do a temporary

route around the pin (doesnt matter if you overlap) and do ratsnest again.

Note, if the pin is surrounded by filled polygons, you should temporary

rename the polygon to something else and redo ratsnest.

-When you got one airwire to the pad, delete THE AIRWIRE.

-Redo temporary changes 

-Now try ERC again.

 

 

After removing erroneous nets, you must run ERC again for the brd and

sch to become consistent again BEFORE you reconnect what once was

removed. As long as there is an inconsistency noting you do in sch will

end up in brd.

1) Remove

2) ERC

3) Repeat 1) and 2) until consistency has been achieved

4) Add what was once removed.

5) Celebrate

Breg

Vidar(Z)