MDDR/FDDR Impedance Calibration

The MDDR and FDDR have a DDRIO calibration block. DDRIO can use fixed impedance calibration for different drive strengths, and these values can be programmed using the Libero SoC software for the selected I/O standard.

Before initiating DDRIO impedance calibration, either of the following must be performed.

For more information on impedance calibration, see the UG0445: SmartFusion2 SoC and IGLOO2 FPGA Fabric User Guide.