Calibration May Fail Without Issuing CAL_FAIL Signal - Calibration May Fail Without Issuing CAL_FAIL Signal Description This problem affects DDR2 and DDR3, QDR II, and RLDRAM II products.. For Stratix V devices using the Nios II-based sequencer, calibration may fail without asserting the CAL_FAIL signal, causing calibration to continue indefinitely. Resolution It is safe to assume that calibration has failed after five seconds of no response; in this circumstance, you may abort the calibration operation. This issue will be fixed in a future version of the external memory interface IP Custom Fields values: ['novalue'] Troubleshooting novalue True ['Nios® II Processor'] ['FPGA Dev Tools Quartus II Software'] novalue 11.1.2 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']