DS-FND-BSX-PC Xilinx Inc, DS-FND-BSX-PC Datasheet - Page 274

• 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
Constraint Entry Mechanisms
B-2
With the Foundation version of the Xilinx design implementation
tools, you control the implementation of a design by defining
constraints that affect the mapping and layout of the physical circuit.
Additionally, you can specify the “path” timing requirements of the
circuit to obtain the best results and allow the implementation tools
to choose the layout which best satisfies these requirements.
The various design constraints available within Foundation can be
entered at the time you create the design (i.e., the logical domain) or
after the design is mapped (that is, the physical domain).
Constraints entered in the logical domain are created in the following
ways
•
•
•
Constraints entered in the physical domain are entered directly into
the Physical Constraints File (PCF). These constraints are
conceptually the same as those entered during design creation;
however, they are directly related to objects within the physical
design database and are therefore applied using the PCF syntax.
The following figure illustrates the constraints entry approach for the
Foundation version of the Xilinx tools.
Entered into the schematic
Applied to a synthesis process and then forward-annotated
through a netlist constraints file (NCF)
Created with the Constraints Editor (see “The Xilinx Constraints
Editor” section.)
Xilinx Development System