21.5.41 MSS DDR Clock Calibration Control Register
| Bit Number | Name | Reset Value | Description | 
|---|---|---|---|
| [31:1] | Reserved | 0 | |
| 0 | FAB_CALIB_START | 0 | Writing to this bit causes a one clock tick pulse to be generated on FABCALIBSTART. This is used to start an FPGA fabric calibration test circuit. | 
