FEC_RS_MEASUREMENT_PRESCALE__A
rc = drxj_dap_write_reg16(dev_addr, FEC_RS_MEASUREMENT_PRESCALE__A, FEC_RS_MEASUREMENT_PRESCALE, 0);
rc = drxj_dap_write_reg16(dev_addr, FEC_RS_MEASUREMENT_PRESCALE__A, fec_rs_prescale, 0);
status = write16(state, FEC_RS_MEASUREMENT_PRESCALE__A, 0x0001);
status = write16(state, FEC_RS_MEASUREMENT_PRESCALE__A,
status = read16(state, FEC_RS_MEASUREMENT_PRESCALE__A, ®16);