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AR# 4134

Orcad Express: Assigning Pin location constraints and other Xilinx attributes.

Description

Keywords: attributes, pin, loc, property, Orcad, Capture, Express

Urgency: Standard

General Description:
How can I assign attributes to parts and nets in my Xilinx design?

Solution

Attributes may be assigned by adding user-defined properties to the
design with values that are accepted by Xilinx.

To declare a net property and assign it a value:

1. In the schematic page editor, select a wire. Then click the right
mouse button and choose Edit Properties. Express displays the Net
Properties dialog box.

2. Choose User Properties. Express displays the User Properties dialog
box.

3. Choose New. Express displays the New Property dialog box.

4. Specify the new property's name, and supply its value. Then choose
the OK button. Express returns to the User Properties dialog box
and displays the new property and its associated value in the
Properties list.

A) If the user creates an XNF file from Express, the net property
name may be any string you need to document the attribute.
For example, use the following property name and associated
value to place a timing name attribute on a net:

Name: my_time_name
Value: TNM=group1

B) If the user creates an EDN file from Express, the net property
name must be the name of the attribute. For example, use the
following property name and associated value to define a pad
location constraint:

Name: TNM
Value: group1


5. Choose OK twice to exit the dialog boxes and return to the
schematic page editor.


To assign a hierarchical block or part property value

1. In the schematic page editor, select a hierarchical block or part
instance. Click the right mouse button and choose Edit Properties.
Express displays the Edit Hierarchical Block dialog box or the
Edit Part dialog box respectively.

2. Choose User Properties. Express displays the User Properties dialog
box.

3. Choose New. Express displays the New Property dialog box.

4. Specify the new properties name, and supply its value. Then choose
the OK button. Express returns to the User Properties dialog box
and displays the new property and its associated value in the
Properties list.

A) If the user creates an XNF file from Express, the net property
name may be any string you need to document the attribute.
For example, use the following property name and associated
value to define a pin location constraint:

Name: pin_location
Value: LOC=P41

B) If the user creates an EDN file from Express, the net property
name must be the name of the attribute. For example, use the
following property name and associated value to define a pin
location constraint:

Name: LOC
Value: P41

5. Choose OK twice to exit the dialog boxes and return to the
schematic page editor.

See http://www.orcad.com for further information.
AR# 4134
Date Created 08/31/2007
Last Updated 10/06/2008
Status Archive
Type General Article