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Using the CONFIG Symbol to Specify Part Type

Properties attached to the CONFIG symbol dictate how the implementation tools process the design.

In Concept, attach properties to a body; they cannot attach to a “Schematic” or `Sheet.” To specify global properties such as part type, you must attach them to the CONFIG symbol.

To specify the Xilinx part type in your schematic, you designate the part type as a PART property on the CONFIG symbol in the top-level schematic. The PART information passes from the EDIF file to NGDBuild and MAP, meaning that you do not need to run NGDBuild or MAP with the -p option unless you want to override the PART information included in the CONFIG symbol.

To add the PART property to the CONFIG symbol, perform the following steps.

  1. Within Concept, select Add Part.

  2. When the Library Browser dialog box displays, click the button to the left of the Library field and select the Xilinx architecture-specific library (xce4000x, for example).

  3. Select CONFIG from the list of components and place this symbol in the schematic.

  4. Display the attributes currently attached to the CONFIG symbol by clicking on the Attribute button and then clicking on the CONFIG symbol.

  5. Click ADD. Enter the PART designation in the Name field. Enter the Xilinx part name in the Value field (for example, 4028EXPG299-3). The following list shows other forms allowed.

XC4028EX-3-PG299
XC4028EX-PG299-3
4028EX-PG299-3
4028EX-3-PG299

You can enter the part name with or without the speed grade. Specifying no speed grade causes the use of a default value. Refer to the “Attributes, Constraints, and Carry Logic” section in the Xilinx Libraries Guide for more information on specifying part type.

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