Xilinx Tool Flow
R
Static Timing Analysis
To evaluate timing closure on a design and create a timing report file (TWR) derived from static timing analysis of the physical design file (NCD), the trce command must be executed. The analysis is typically based on constraints included in the optional physical constraints file (PCF). An example of the trce command is provided below:
trce
The trce command outputs a routed.twr file, which performs timing analysis of the placed and routed design based on the user constraints.
Timing Simulation
After the user design is functionally correct and meets all timing constraints, it is recommended the user perform
netgen
The netgen command outputs routed.v[hd] and routed.sdf files, which allow the user to run timing simulation.
Generating a Bitstream
To create the configuration (BIT) file based on the contents of a physical implementation file (NCD), the bitgen command must be executed. The BIT file defines the behavior of the programmed FPGA. An example of the bitgen command is provided below:
bitgen
Note the user should take care in setting the required bitgen options, including selection of the startup clock. See the Development System Reference Guide for details.
www.xilinx.com | 129 |
UG181 June 27, 2008