DIV_PRE_N
if (f_vco >= div_u64((u64) DIV_PRE_N * DIV_N_MIN * F_REF, 1)) {
} else if (f_vco >= div_u64((u64) DIV_PRE_N * DIV_N_MIN * F_REF, 2)) {
uitmp = DIV_PRE_N * F_REF / div_ref;
div_n = div_u64_rem(f_vco, DIV_PRE_N * F_REF, &k);
k_thresh = (DIV_PRE_N * F_REF) / F_VCO_STEP;
k_frac = div_u64((u64) k * k_thresh, (DIV_PRE_N * F_REF));
uitmp = (unsigned int) F_REF * DIV_PRE_N * div_n;
uitmp += (unsigned int) F_REF * DIV_PRE_N * k_frac / k_thresh;
div_n = div_u64_rem(f_vco, DIV_PRE_N * F_REF, &k);
k_cw = div_u64((u64) k * 0x200000, DIV_PRE_N * F_REF);