DRC on duplicate nets

Off-page connectors carry nets (names) between schematic pages within the same schematic folder.

You can use the signal navigation feature in Capture to navigate the connected signals on a design. This feature allows you to select a signal that you want to trace. Capture then browses for all the connected signals on the design. Finally, you can select and highlight the signals from the browse list.

To find and navigate the signals on a design
1. Select the off-page connector, hierarchical port, net or bus to find its connecting signals.
2. Right-click and choose the Signals option from the pop-up menu.
3. A browse list appears with all the signals that are connected to the currently selected signal.

4.Double-click on a signal in this list to navigate to the connected signal.

Also, I want like to understand if there is some particular requirement due to which you want to use this DRC?

I understand the offpage connector but it doesn't solve issue here.

For example, if I accidentally named two nets the same name. I want to DRC check to be able to find out and warning me. Otherwise two nets will be connected together. 

When signals with the same aliases (names) are on the same schematic page, OrCAD Capture automatically connects them. In the following illustration, C1 and R1 are connected to Net1.

Are you giving same net names on same schematic page or on different schematic pages?

I am naming the same net name on the same schematic. I want Cadence to capture the same nets during DRC check. To your example, I want Candence DRC check to tell me there is a NET1 that doesn't have off page connector but connected in two different places. I always explicitly use the off-page connector if I want the net name to be the same to avoid error.

Can you try using the net names in the Find Window in OrCAD Capture?

I have searched NET1 in Find window as shown below it is highlighting the nets present on the schematic page.

There is no DRC in OrCAD from GUI to check the nets which have same name connected in some instances and are not connected from off-page. Are you interested in TCL Scripting to generate this DRC?

Yes, TCL scripts work for me, can I have one? 

Please perform below steps to run TCL Script >

1. Copy the attached script in notepad and save the file.
    
2. Invoke OrCAD Capture and open the schematic design.
    
3. Select the design file (.dsn) in the Project Manager.
    
4. Select View > Command Window.
    
5. Source the script in Capture using the following command: 

source {path_to_script\tcl_dump_duplicate_net_name.tcl}
 

Example: 

source C:\TCL\tcl_dump_duplicate_net_name.tcl} and enter dumpToSessionlog in next line.

Go to Session Log and see the off page name along with page number is present in the session log.

Code >

#Dump duplicate nets with page name info into sessionlog window
proc dumpWireList {} {
# global i
set lSession $::DboSession_s_pDboSession
DboSession -this $lSession
set lNullObj NULL
set lNetNameCString [DboTclHelper_sMakeCString]
set duplicateNetName {}
set lStatus [DboState]
set lDesign [$lSession GetActiveDesign]
set lSchi_Name [DboTclHelper_sMakeCString]
set lSchematicIter [$lDesign NewViewsIter $lStatus $::IterDefs_SCHEMATICS]
#get the first schematic view
set lView [$lSchematicIter NextView $lStatus]

set lPage_Name [DboTclHelper_sMakeCString]

while { $lView != $lNullObj} {
#dynamic cast from DboView to DboSchematic
set lSchematic [DboViewToDboSchematic $lView]
$lSchematic GetName $lSchi_Name
set lPagesIter [$lSchematic NewPagesIter $lStatus]
#get the first page
set lPage [$lPagesIter NextPage $lStatus]

# puts [DboTclHelper_sGetConstCharPtr $lSchi_Name]

while {$lPage!=$lNullObj} {
#placeholder: do your processing on $lPage
$lPage GetName $lPage_Name
set lPageName [DboTclHelper_sGetConstCharPtr $lPage_Name]
set lWiresIter [$lPage NewWiresIter $lStatus]
#get the first wire
set lWire [$lWiresIter NextWire $lStatus]
set lNullObj NULL
while {$lWire != $lNullObj} {
set lObjectType [$lWire GetObjectType]
if {$lObjectType == $::DboBaseObject_WIRE_SCALAR} {
#placeholder: do your processing on Wire scalar $lWire
$lWire GetNetName $lNetNameCString
set lNetName [DboTclHelper_sGetConstCharPtr $lNetNameCString]

# puts [lsearch $duplicateNetName $lNetName]
if {[lsearch $duplicateNetName $lNetName] == -1} {
lappend duplicateNetName $lNetName
}
}
#get the next wire
set lWire [$lWiresIter NextWire $lStatus]
}
delete_DboPageWiresIter $lWiresIter


set lPage [$lPagesIter NextPage $lStatus]
}
#placeholder: do your processing on $lSchematic

#puts $lSchematic

#get the next schematic view
set lView [$lSchematicIter NextView $lStatus]
}
delete_DboLibViewsIter $lSchematicIter
delete_DboSchematicPagesIter $lPagesIter

return $duplicateNetName
}

proc dumpToSessionlog {} {
# global i
set lSession $::DboSession_s_pDboSession
DboSession -this $lSession
set lNullObj NULL
set lWirelist [dumpWireList]
set lNetNameCString [DboTclHelper_sMakeCString]
set duplicateNetName {}
set lStatus [DboState]
set lDesign [$lSession GetActiveDesign]
set lSchi_Name [DboTclHelper_sMakeCString]
set lPageNamelist {}
ClearSessionLog
foreach wireName $lWirelist {
set lSchematicIter [$lDesign NewViewsIter $lStatus $::IterDefs_SCHEMATICS]
#get the first schematic view
set lView [$lSchematicIter NextView $lStatus]

set lPage_Name [DboTclHelper_sMakeCString]

while { $lView != $lNullObj} {
#dynamic cast from DboView to DboSchematic
set lSchematic [DboViewToDboSchematic $lView]
$lSchematic GetName $lSchi_Name
set lPagesIter [$lSchematic NewPagesIter $lStatus]
#get the first page
set lPage [$lPagesIter NextPage $lStatus]

# puts [DboTclHelper_sGetConstCharPtr $lSchi_Name]
while {$lPage!=$lNullObj} {
#placeholder: do your processing on $lPage
$lPage GetName $lPage_Name
set lPageName [DboTclHelper_sGetConstCharPtr $lPage_Name]
set lWiresIter [$lPage NewWiresIter $lStatus]
#get the first wire
set lWire [$lWiresIter NextWire $lStatus]
set lNullObj NULL
while {$lWire != $lNullObj} {
set lObjectType [$lWire GetObjectType]
if {$lObjectType == $::DboBaseObject_WIRE_SCALAR} {
#placeholder: do your processing on Wire scalar $lWire
$lWire GetNetName $lNetNameCString
set lNetName [DboTclHelper_sGetConstCharPtr $lNetNameCString]
if {$wireName == $lNetName && [lsearch $lPageNamelist $wireName\_$lPageName] == -1 } {

lappend lPageNamelist $wireName\_$lPageName
DboState_WriteToSessionLog [DboTclHelper_sMakeCString $wireName\_$lPageName]

}

}
#get the next wire
set lWire [$lWiresIter NextWire $lStatus]
}
delete_DboPageWiresIter $lWiresIter


set lPage [$lPagesIter NextPage $lStatus]
}
#placeholder: do your processing on $lSchematic

#puts $lSchematic

#get the next schematic view
set lView [$lSchematicIter NextView $lStatus]
}
delete_DboLibViewsIter $lSchematicIter
delete_DboSchematicPagesIter $lPagesIter
}

# return $lPageNamelist
}

Let me know how it goes for you after running the TCL Script.

Please perform below steps to run TCL Script >

1. Copy the attached script in notepad and save the file.
    
2. Invoke OrCAD Capture and open the schematic design.
    
3. Select the design file (.dsn) in the Project Manager.
    
4. Select View > Command Window.
    
5. Source the script in Capture using the following command: 

source {path_to_script\tcl_dump_duplicate_net_name.tcl}
 

Example: 

source C:\TCL\tcl_dump_duplicate_net_name.tcl} and enter dumpToSessionlog in next line.

Go to Session Log and see the off page name along with page number is present in the session log.

Code >

#Dump duplicate nets with page name info into sessionlog window
proc dumpWireList {} {
# global i
set lSession $::DboSession_s_pDboSession
DboSession -this $lSession
set lNullObj NULL
set lNetNameCString [DboTclHelper_sMakeCString]
set duplicateNetName {}
set lStatus [DboState]
set lDesign [$lSession GetActiveDesign]
set lSchi_Name [DboTclHelper_sMakeCString]
set lSchematicIter [$lDesign NewViewsIter $lStatus $::IterDefs_SCHEMATICS]
#get the first schematic view
set lView [$lSchematicIter NextView $lStatus]

set lPage_Name [DboTclHelper_sMakeCString]

while { $lView != $lNullObj} {
#dynamic cast from DboView to DboSchematic
set lSchematic [DboViewToDboSchematic $lView]
$lSchematic GetName $lSchi_Name
set lPagesIter [$lSchematic NewPagesIter $lStatus]
#get the first page
set lPage [$lPagesIter NextPage $lStatus]

# puts [DboTclHelper_sGetConstCharPtr $lSchi_Name]

while {$lPage!=$lNullObj} {
#placeholder: do your processing on $lPage
$lPage GetName $lPage_Name
set lPageName [DboTclHelper_sGetConstCharPtr $lPage_Name]
set lWiresIter [$lPage NewWiresIter $lStatus]
#get the first wire
set lWire [$lWiresIter NextWire $lStatus]
set lNullObj NULL
while {$lWire != $lNullObj} {
set lObjectType [$lWire GetObjectType]
if {$lObjectType == $::DboBaseObject_WIRE_SCALAR} {
#placeholder: do your processing on Wire scalar $lWire
$lWire GetNetName $lNetNameCString
set lNetName [DboTclHelper_sGetConstCharPtr $lNetNameCString]

# puts [lsearch $duplicateNetName $lNetName]
if {[lsearch $duplicateNetName $lNetName] == -1} {
lappend duplicateNetName $lNetName
}
}
#get the next wire
set lWire [$lWiresIter NextWire $lStatus]
}
delete_DboPageWiresIter $lWiresIter


set lPage [$lPagesIter NextPage $lStatus]
}
#placeholder: do your processing on $lSchematic

#puts $lSchematic

#get the next schematic view
set lView [$lSchematicIter NextView $lStatus]
}
delete_DboLibViewsIter $lSchematicIter
delete_DboSchematicPagesIter $lPagesIter

return $duplicateNetName
}

proc dumpToSessionlog {} {
# global i
set lSession $::DboSession_s_pDboSession
DboSession -this $lSession
set lNullObj NULL
set lWirelist [dumpWireList]
set lNetNameCString [DboTclHelper_sMakeCString]
set duplicateNetName {}
set lStatus [DboState]
set lDesign [$lSession GetActiveDesign]
set lSchi_Name [DboTclHelper_sMakeCString]
set lPageNamelist {}
ClearSessionLog
foreach wireName $lWirelist {
set lSchematicIter [$lDesign NewViewsIter $lStatus $::IterDefs_SCHEMATICS]
#get the first schematic view
set lView [$lSchematicIter NextView $lStatus]

set lPage_Name [DboTclHelper_sMakeCString]

while { $lView != $lNullObj} {
#dynamic cast from DboView to DboSchematic
set lSchematic [DboViewToDboSchematic $lView]
$lSchematic GetName $lSchi_Name
set lPagesIter [$lSchematic NewPagesIter $lStatus]
#get the first page
set lPage [$lPagesIter NextPage $lStatus]

# puts [DboTclHelper_sGetConstCharPtr $lSchi_Name]
while {$lPage!=$lNullObj} {
#placeholder: do your processing on $lPage
$lPage GetName $lPage_Name
set lPageName [DboTclHelper_sGetConstCharPtr $lPage_Name]
set lWiresIter [$lPage NewWiresIter $lStatus]
#get the first wire
set lWire [$lWiresIter NextWire $lStatus]
set lNullObj NULL
while {$lWire != $lNullObj} {
set lObjectType [$lWire GetObjectType]
if {$lObjectType == $::DboBaseObject_WIRE_SCALAR} {
#placeholder: do your processing on Wire scalar $lWire
$lWire GetNetName $lNetNameCString
set lNetName [DboTclHelper_sGetConstCharPtr $lNetNameCString]
if {$wireName == $lNetName && [lsearch $lPageNamelist $wireName\_$lPageName] == -1 } {

lappend lPageNamelist $wireName\_$lPageName
DboState_WriteToSessionLog [DboTclHelper_sMakeCString $wireName\_$lPageName]

}

}
#get the next wire
set lWire [$lWiresIter NextWire $lStatus]
}
delete_DboPageWiresIter $lWiresIter


set lPage [$lPagesIter NextPage $lStatus]
}
#placeholder: do your processing on $lSchematic

#puts $lSchematic

#get the next schematic view
set lView [$lSchematicIter NextView $lStatus]
}
delete_DboLibViewsIter $lSchematicIter
delete_DboSchematicPagesIter $lPagesIter
}

# return $lPageNamelist
}

Let me know how it goes for you after running the TCL Script.