Power-up Calibration and User Recalibration are the main types of calibration.
- Power-up calibration occurs automatically at device power-up. It runs during device configuration.
- If you perform dynamic reconfiguration, then you must perform User Recalibration. In this case, you are responsible for enabling the required calibration sequence.
Arria® 10 devices use CLKUSR for transceiver calibration. To successfully complete the calibration process, the CLKUSR clock must be stable and free running at the start of FPGA configuration. Also, all reference clocks driving transceiver PLLs (ATX PLL, fPLL, CDR/CMU PLL) must be stable and free running at start of FPGA configuration. For more information about CLKUSR pin requirements, refer to the Arria 10 GX, GT, and SX Device Family Pin Connection Guidelines.
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