IBM CLC-CAPT-PCASM manual Cdrom

**DRCS_Serial “DRCS_ser_fft.m” is the script intended for analysis of the DRCS 24-bit serial out- put data. Fsample is set to a default of 52e6/192 which is the GSM standard output rate of 270.833KS/s. The “search’ option is enabled; therefore, excluding the DC bins, the peak FFT bin is assumed to be the input fundamental. A default 4- term data window is used.

**DRCS_Debug “DRCS_par_fft.m” is the script intended for analysis of the DRCS 16-20 bit parallel debug data. The hardware setting will determine the actual Fsample variable needed. The data is always placed within a 24-bit word with MSB justification. The default Fsample is set to the assumed clock frequency of 52MHz with no decimation. If a debug port is selected which has decimated data, the Fsample variable will require an appropriate adjust- ment. Carefully edit and save the new value into the script file. The original file can be recovered from the

CDROM.

**14-bit FFT “b14_FFT.m” is the script intended for data analysis in conjunction with the CLC5958 Eval- uation Board. All the FFT routines can be run with a rectangular window by setting the variable to “0”. Setting the “Dither” variable excludes a lower portion of the spectrum from the FFT analysis and is intended to be used in conjunction with a base-band dither signal being present at the ADC analog input.

**12-bit FFT “b12_FFT.m” is the script intended for data analysis in conjunction with the CLC5956 Evaluation Boards.

**DNL_INL “dnl_inl.m” - is the script intended for data analysis of the histogram data file generated by the Data Capture Board. The data file has a fixed 2^15 length (i.e. the number of histogram bins). SW1 on the Capture Board is set to LSB justify the ADC data within the 2^15 bins. 12-18 bit histograms are supported. This Matlab script automatically scales to the data source. In addition to the graphic plots, the routine gives the number of samples, input amplitude (dBFS of ADC), and data DC offset (in LSBs). See the Data Capture Board User Manual for more info.

**Plot_Data this script is contained within “analysis_menu.m”. It simply clears the figure, loads the data file from the default location, and plots the new data. No data manipulation occurs. If the user wishes to view offset binary formatted data which has been normalized to ±1, he should first run the appropriate FFT analysis, then clear the plot figure (use “clf“at Matlab command line) and plot the variable “u” (use “plot(u,’.’)” at Matlab command line).

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