IQM_AF_PDREF__A
rc = drxj_dap_write_reg16(dev_addr, IQM_AF_PDREF__A, pre_saw->reference, 0);
rc = drxj_dap_write_reg16(dev_addr, IQM_AF_PDREF__A, 4, 0);
status = write16(state, IQM_AF_PDREF__A, p_pre_saw_cfg->reference);