The following sections describe known issues at the time of the DSP Module 8.6 release. * The Show Implementation feature of the following DSP-specific Express VIs does not find DSP-specific subVIs: Simulate Signal, Sweep Generator, Spectral Measurements, Filter, and DFD Filter. * When using a Digital Filter Design Toolkit filter file with the DFD Filter Express VI, the DFD Filter Express VI does not compare the sample rate of the input signal with the sample rate in the filter file. Therefore, the output of the DFD Filter Express VI might be different than what you expect if the two sample rates are not the same value. * If LabVIEW is not open and you double-click a custom DSP VI or a DSP VI from the labviewexamples directory, LabVIEW cannot find the DSP-specific VIs and opens with a broken Run button. You must open or create a DSP project first and then open the VI in a DSP application instance. Refer to the Creating DSP Projects topic in the LabVIEW Help for more information about creating and using DSP projects. * LabVIEW cannot use the external memory on the Spectrum Digital 6416 DSK target. The 6416 DSK has 1 MB of on-chip memory. * The Spectrum Digital 6416 DSK uses a fixed-point DSP, but the LabVIEW DSP Module implements floating-point emulation for some algorithms using the Texas Instruments Fast Run-Time Support Library (FastRTS). * Larger data types, such as double-precision numerics, might be coerced to a smaller data type, such as a single-precision numeric, without warning or error when you target a DSP depending on the capabilities of the processor. * The To Long Integer primitive cannot distinguish between the I32 and U16 data representations. A U16 data value of 65535 is interpreted as a value of -1. * Smaller data types, such as 8-bit integers, might be converted to larger data types, such as 32-bit integers, without warning or error when you target a DSP depending on the capabilities of the processor.