REFRESH_SPEEDUP
ref = REFRESH_SPEEDUP(ref, 2);
pre_ref = REFRESH_SPEEDUP(pre_ref, 2);
dsr_cntrl = REFRESH_SPEEDUP(dsr_cntrl, 2);
ref = REFRESH_SPEEDUP(ref, 4);
pre_ref = REFRESH_SPEEDUP(pre_ref, 4);
dsr_cntrl = REFRESH_SPEEDUP(dsr_cntrl, 4);