HC_ITD_FC_SHIFT
ctrl = ((((frame_count - 1) << HC_ITD_FC_SHIFT) &
ctrl = ((((frame_count - 1) << HC_ITD_FC_SHIFT) &
fc = (hctd_ctrl & HC_ITD_FC) >> HC_ITD_FC_SHIFT;
HC_ITD_FC) >> HC_ITD_FC_SHIFT) + 1;
HC_ITD_FC) >> HC_ITD_FC_SHIFT;