Version Fixed: ISE14.2(v3.92)
This is due to an issue in the "mcb_soft_calibration.v/vhd" rtl.
To work around this issue, do the following:
Locate this section of RTL within the "mcb_soft_calibration.v/.vhd":
Modify this section to the following:
The issue arises if the RTL was coded to wait for START_DYN_CAL state when SELFREFRSH_MCB_REQ is deasserted, which causes the calibration state machine to get stuck at either the INCREMENT or DECREMENT state.
If you use the self-refresh mode, you should integrate this RTL code change.
9/5/2014 - Initial Release