FEC_OC_SNC_LWM__A
rc = drxj_dap_write_reg16(dev_addr, FEC_OC_SNC_LWM__A, 3, 0);
rc = drxj_dap_write_reg16(dev_addr, FEC_OC_SNC_LWM__A, 2, 0);
status = write16(state, FEC_OC_SNC_LWM__A, 2);