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Synthesis and Simulation Design Guide
Chapter 3: Understanding High-Density Design Flow

Downloading to the Device and In-system Debugging

After you have verified the functionality and timing of your placed and routed design, you can create a design data file to download for in-system verification. The design data or bitstream (.bit) file is created from the placed and routed .ncd file. In the Design Manager, use the Configuration step in the Flow Engine to create this file. From the command line, run BitGen on your placed and routed .ncd file to create the .bit file as follows.

bitgen [options] design.ncd

Use the .bit file with the XChecker cable and the Hardware Debugger to download the data to your device. You can run the Hardware Debugger from the Design Manager, or from the command line as follows.

hwdebugr design.bit

The Hardware Debugger allows you to download the data to the FPGA using your computer's serial port. The Hardware Debugger can also synchronously or asynchronously probe external or internal nodes in the FPGA. Waveforms can be created from this data and correlated to the simulation data for true in-system verification of your design.