Ghost NETCLASS property on nets in PCB editor - cannot be found anywhere in constraints manager

Sounds something i already encounter.

If you have a "NET_PHYSICAL_TYPE", say "GND"

and a "NET_SPACING _TYPE" with he same name (GND in this example) then they are "merged" into  "CLASS".

Does someone create a NET_SPACING_TYPE named HPWR_NETS ?

May  t be related but have a look in this direction

Hi,

Thanks for the suggestion! I took a look at the pstxnet.dat netlist file just now. Unfortunately there is no NET_SPACING_TYPE property defined on any of the nets. The only property attached to a select few is the NET_PHYSICAL_TYPE property.

Cheer!

Hi Aleks, the suffix _PH for Physical netclass is made to handle the possibility of a SPACING netclass having the same name as a PHYSICAL netclass. This helps to differentiate the two netclasses. This tagging takes place in the PCB Editor. When we back-annotate, the naming with suffix is pushed to Design Entry CIS. The change is seen in the design.swp file ;

.Section2 UpdateProperties Nets UppercaseCombined
"{Net Name}" "NET_PHYSICAL_TYPE"
"N00237" "TRY1_PH"
.End

In order to delete a netclass using SKILL, please save the following SKILL code to your design directory using a text editor. Rename the text file containing this code to the filename "Delete_Net_Class.il"

1. To load this SKILL file, open Allegro PCB Editor and at the command prompt, type skill load "Delete_Net_Class.il" and press Enter.
2. Run the SKILL function, by typing the net_cls_delete command at the command prompt and pressing Enter. 

It will pop up a window. Enter the Net class to be deleted in CAPITAL letters and click on OK:

Caution - this code is provided as is. Extreme caution should be taken when manipulating elements such as nets or netclasses from any design. 

SKILL code:

/*******************************************************************
* DISCLAIMER: The following code is provided for Cadence customers *
* to use at their own risk. The code may require modification to *
* satisfy the requirements of any user. The code and any *
* modifications to the code may not be compatible with current or *
* future versions of Cadence products. *
* THE CODE IS PROVIDED "AS IS" AND WITH NO WARRANTIES, INCLUDING *
* WITHOUT LIMITATION ANY EXPRESS WARRANTIES OR IMPLIED WARRANTIES *
* OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. *
********************************************************************
*****************************************************************************************************************************************************************************************
* Author: Balumuru Vinay Kumar - Cadence Design Systems *
* *
* The provided skill code delete the predefined Net_Class at the board created either manually or inhertied from Schematic through netlist import *
* *
* To run the skill command follow the suggested steps below: *
* *
* - Invoke Allegro PCB Editor and open attached sample board ( Net_class_del.brd), in which the Net Class exists (eg: sample) *
* - In the command window enter the following command to load the skill file :- Command> skill load "Delete_Net_Class.il" *
* - In the command window, to run the function type 'Net_Class_Delete' command as follows:- Command> Net_Cls_Delete *
* - This will display an UI window, enter the required Net_Class name to be deleted in all CAPITALs and click on OK *
* - Note: Please enter the the correct Net_Class to be deleted in all Capitals with no spaces *
*****************************************************************************************************************************************************************************************/

axlCmdRegister("Net_Cls_Delete" 'Net_Class_Delete)

procedure(Net_Class_Delete()
let( (DB_Design Net_cls_DB_ID Temp Net_cls_to_del Var)

DB_Design = axlDBGetDesign()
Net_cls_DB_ID=DB_Design->netclass
Net_cls_to_del= axlUIPrompt("Enter the correct Net_Class to be deleted in all Capitals with no spaces\n") ; Getting the Net class name to be deleted
if(Net_cls_to_del == nil then
printf("Please enter the required Net_class to delete\n")
else
foreach(Temp Net_cls_DB_ID

if(Net_cls_to_del == Temp->name then ; comparing given Net class with all Net classes in the design.
printf("test pass\n")
axlNetClassDelete(Temp) ; if Netclass matches then using axlNetClassDelete() to delete the Net class
Var =1))
if(Var ==1 then
printf("The Netclass: '%s' is deleted\n" Net_cls_to_del)
else
printf("The entered Net_class : '%s' is not defined in the board\n" Net_cls_to_del))
);end_if
); end local variable scope
); end_Net_Class_Delete