DS-FND-BSX-PC Xilinx Inc, DS-FND-BSX-PC Datasheet - Page 52

• Manufacturer Part Number: DS-FND-BSX-PC
• Description: FOUNDATION BASE SYS W/SYN EXPRES
• Manufacturer: Xilinx Inc
• Type: Foundation Systemr

Specifications of DS-FND-BSX-PC

• For Use With/related Products: Xilinx Programmable Logic Devices
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 122-1185

Foundation Series 2.1i User Guide
Implementation Tools
2-20
Control Files
Once you have completed design entry and are ready for physical
implementation of the design, you begin implementation processing
by clicking the Implementation button on the project flowchart.
All the steps needed to obtain the final results are invoked automati-
cally. Refer to the “Design Implementation” chapter for more infor-
mation.
You can control the implementation of your design with a user
constraints file, an implementation guide file, or a Floorplanner file.
You can set these files by selecting Implementation
File(s), or Set Floorplan File(s), or Set Constraints
File(s) from the Project Manager. Or, you can access a dialog box
to set the files by clicking the Control Files SET button in the Physical
Implementation Settings section of the window that appears when
you implement a new version or revision of your design.
User Constraints File
Constraints can be applied to control the implementation of a design.
Location constraints, for example, can be used to control the mapping
and positioning of logic elements in the target device. Timing
constraints can be used to identify critical paths that need closer
placement and faster routing. For a list of the constraints that can be
applied for the various devices, refer to the “Attributes, Constraints,
and Carry Logic” chapter of the Libraries Guide.
The User Constraints File (UCF) is a user-created ASCII file that holds
the constraints. You can enter the constraints directly in the input
design. However, putting them in the UCF separates them from the
input design files and provides for easier modification and reduces
re-synthesis of your design. You can create the UCF using a text
editor or you can use the Xilinx Constraints Editor to produce the
UCF for you. UCF files can also be reused from design to design.
Implementation Guide File
Guide files from a previous implementation can be used to speed up
the current implementation. When an implementation guide file is
Xilinx Development System
Set Guide