Embedded Target for Texas Instruments C6000 DSPs

Selecting the Export Data Type

When you export a filter, the export process suggests the export data type that best preserves the performance of your filter. Use the suggested export data type by selecting Export suggested in the Export to CCS IDE dialog. The supported export data types are

• Signed integer (8-, 16-, or 32-bit)
• Unsigned integer (8-, 16-, or 32-bit)
• Double-precision floating point
• Single-precision floating point

Recommended Procedure for Selecting Export Data Type

By adhering to the following procedure when you set the export data type of your filter, the exported filter coefficients closely match the coefficients of the filter you designed in FDATool.

Step 1--Set the Numerical Precision of Your Filter in FDATool.   Set the numerical precision of your filter in FDATool by using the Quantized Filter pane, available when you install the Filter Design Toolbox. If you do not have the Filter Design Toolbox, your filters in FDATool have the default precision-- double-precision floating point.

Step 2--Select an Export Data Type in the Export to CCS IDE Dialog.   Use the export data type indicated by the Export suggested parameter in the Export to CCS IDE dialog. See the following note.

Though Step 2 insists you use the Export suggested parameter, you may find it useful to select the Export as option and select an export data type other than the one suggested. However, if you deviate from the suggested data type, the exported filter coefficients can be very different from the coefficients of the filter you designed in FDATool.

Note    When you design your filter using an unsupported data type, the Export to CCS IDE dialog rounds the word length up to the next supported data type, and maintains the specified difference between the word length and fraction length. For example, for a filter with 14-bit word length and an 11-bit fraction length, the Export suggested parameter sets the export data type to a signed 16-bit integer with a 13-bit fraction length.

Variables and Memory Necessary for Filter Export

Tutorial--Exporting Filters from FDATool to CCS IDE