During calibration, the DQSFOUND stage aligns the different DQS groups to the same PHY_Clk and finds the optimal read data offset position with respect to the read command. The DQSFOUND calibration logic issues sets of four back-to-back reads with gaps in between. Starting with MIG 7 Series v1.7, additional sets of four back-to-back read cycles were added. Because of this, simulation time will increase. As an example, a MIG v1.6 simulation that took 5 minutes to complete calibration will take 10 minutes to complete with MIG 1.7.
This answer record details a work-around to reduce simulation time with the MIG v1.7 design. The work-around noted will be included by default in MIG 7 Series v1.8.
To reduce the simulation time, complete the following steps: