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Subject: instance name
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mcmontague
Posts: 3
Online: User is Offline
7/24/2008 5:19 PM  

Hello,
I'm new to working with Design Entry HDL.  I have a couple of questions about instance names and reference designators.  Thanks in advance for any help.

When I add a part to the schematic, it is assigned an instance name automatically, for example "I2."  When I packaged the design, I see that this caused reference designators to be assigned, for example, the part "I2" now also shows up in the schematic as "R1." 

My first question is: Now that the reference designators are showing, is there a way to hide the instance names so they don't clutter up the design?

2nd question: I see that a new attribute was added to my parts, $LOCATION, that contains the reference designator.  But I also see parts with a attribute LOCATION (no "$").  Is the $ important?

3rd question: is there a way to quickly change a group of reference designator values, for example a large group of components I want to designate in order as U1, U2, ... U100?

Thanks for your help!
Mike Montague
andrewjw
Posts: 46
Online: User is Offline
7/25/2008 12:52 AM  

The instance (PATH property), or any property, visibility can be changed using a number of ways:-

Single item - Text->Attribute, click on the object then change the visibilty on a single item
Multiple items - Create a Group either by selecting items in the Group or Create by Expression, then change the visibility of the group.
All items - use Text->Global Property Display

LOCATION or $LOCATION is the refdes. $LOCATIOn is system assigned by the Packager (Export Physical) to any components that have not been user assigned. User assigned properties are LOCATION. $LOCATION is a soft property, and LOCATION is a hard property - this means that $LOCATION could possibly be changed by the packager if ther's a conflict between a hard and soft property.

To change a group of refdes - the best way is to probably create a group (either manually or by expression), once the group is created you can either text edit them one by one using Group->Text Change OR you can pipe them into Wordpad using Group->Text Change then clicking Right Mouse Button in the DEHDL workspace and selcting Editor. Once you change a $LOCATION value it changes the property to LOCATION - SOFT to HARD.
mcmontague
Posts: 3
Online: User is Offline
7/25/2008 11:32 AM  
Thanks!
That was really helpful. One question on changing the $PROPERTY attribute by group: After creating a group, I went to Group-Text Change but nothing appeard to happen. Possibly a cursor appeared in the value field. Could you explain again how would I go about editing all the $PROPERTY values in a group using this method?

Thanks again for all of your help,
Mike M.
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