FEC_RS_MEASUREMENT_PERIOD__A
rc = drxj_dap_write_reg16(dev_addr, FEC_RS_MEASUREMENT_PERIOD__A, FEC_RS_MEASUREMENT_PERIOD, 0);
rc = drxj_dap_write_reg16(dev_addr, FEC_RS_MEASUREMENT_PERIOD__A, (u16)fec_rs_period, 0);
status = write16(state, FEC_RS_MEASUREMENT_PERIOD__A, 0x400);
status = write16(state, FEC_RS_MEASUREMENT_PERIOD__A, 0x1000);
status = write16(state, FEC_RS_MEASUREMENT_PERIOD__A, fec_rs_period);
status = read16(state, FEC_RS_MEASUREMENT_PERIOD__A, ®16);