Why wasn't my finite impulse response (FIR) filter implemented in the Stratix digital signal processing (DSP) blocks even though I turned on the Use Stratix Dedicated DSP Block check box in the Quartus® II software? - Why wasn't my finite impulse response (FIR) filter implemented in the Stratix digital signal processing (DSP) blocks even though I turned on the Use Stratix Dedicated DSP Block check box in the Quartus® II software? Description There is a problem in the FIR Compiler version 2.5 that causes FIR filters with certain, small input and/or coefficient bit widths to be implemented in logic elements (LEs) rather than in the Stratix DSP blocks. As a workaround, you can manually assign the multipliers to the Stratix DSP blocks by performing the following steps: In the project directory, open the file < FIR filter name > _st.v . To implement q multipliers in DSP blocks for module instantiations Umlu_0_n , Umlu_1_n , Umlu_2_n ,..., Umlu_q-2_n , and Umlu_q-1_n , find the module instantiation Umlu_ x _d , where x is a number between 0 and q-1. Add the following parameter definition to the module instantiation, replacing x with the number in the module instantiation name: defparam Umlu_ x _n.DSP_USE = "YES"; This problem is currently scheduled to be fixed in a future version of the FIR Compiler. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']