/* * The following defines establish the performance envelope of the * kernel discipline loop. Phase or frequency errors greater than * NAXPHASE or MAXFREQ are clamped to these maxima. For update intervals * less than MINSEC, the loop always operates in PLL mode; while, for * update intervals greater than MAXSEC, the loop always operates in FLL * mode. Between these two limits the operating mode is selected by the * STA_FLL bit in the status word. */