3.4.3.2 SmartDebug Decision Feedback Equalization Support

SmartDebug is used to adapt the Decision Feedback Equalization (DFE) coefficients to optimize the settings for the overall signal integrity at the receiver for the system under test environment. On-demand, the SmartDebug utility runs the adaptive algorithm to the DFE filter to resolve the TAP values of the DFE coefficients. This can be applied on any XCVR design greater than 5G. The routine is invoked from the Optimize DFE in the GUI. The TXPLL needs to be locked to begin the DFE procedure. This runs the algorithm to set the optimal settings. The optimized settings remain intact until the next DEVRSTn or power cycle. The following figure shows the Optimize DFE window.

Figure 3-10. Example of Optimize DFE

For more information about the Optimized DFE feature, see PolarFire FPGA SmartDebug User Guide.