DSP Builder for Intel® FPGAs (Advanced Blockset): Handbook

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ID 683337
Date 9/30/2024
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Document Table of Contents
Document Table of Contents x
Answers to Top FAQs 1. About DSP Builder for Intel® FPGAs 2. DSP Builder for Intel FPGAs Advanced Blockset Getting Started 3. DSP Builder Design Flow 4. Primitive Library Blocks Tutorial 5. IP Tutorial 6. DSP Builder for Intel FPGAs (Advanced Blockset) Design Examples and Reference Designs 7. DSP Builder Design Rules, Design Recommendations, and Troubleshooting 8. About DSP Builder for Intel FPGAs Optimization 9. About Folding 10. Floating-Point Data Types 11. Design Configuration Library 12. IP Library 13. Interfaces Library 14. Primitives Library 15. Utilities Library 16. Simulink Supported Blocks 17. Document Revision History for DSP Builder for Intel FPGAs (Advanced Blockset) Handbook
1. About DSP Builder for Intel® FPGAs x
1.1. DSP Builder for Intel® FPGAs Features 1.2. DSP Builder for Intel® FPGAs Design Structure 1.3. DSP Builder for Intel® FPGAs Libraries 1.4. DSP Builder for Intel® FPGAs Device Support 1.5. FPGA Architecture Features for DSP Designs 1.6. DSP Design Flow in FPGAs 1.7. Software and Hardware DSP Design Flows in FPGAs
2. DSP Builder for Intel FPGAs Advanced Blockset Getting Started x
2.1. System Requirements 2.2. Installing DSP Builder for Intel® FPGAs 2.3. Licensing DSP Builder for Intel® FPGAs 2.4. Starting DSP Builder in MATLAB on Windows 2.5. Starting DSP Builder in MATLAB on Linux 2.6. Browsing DSP Builder Libraries and Adding Blocks to a New Model 2.7. Browsing and Opening DSP Builder Design Examples 2.8. Creating a New DSP Builder Design with the DSP Builder New Model Wizard 2.9. Simulating, Generating, Verifying, and Compiling Your DSP Builder Design 2.10. Generating a Fast Simulation Model
2.8. Creating a New DSP Builder Design with the DSP Builder New Model Wizard x
2.8.1. DSP Builder Menu Options 2.8.2. DSP Builder New Model Wizard Setup Script Parameters
3. DSP Builder Design Flow x
3.1. Implementing your Design in DSP Builder Advanced Blockset 3.2. Verifying your DSP Builder Advanced Blockset Design in Simulink and MATLAB 3.3. Exploring DSP Builder Advanced Blockset Design Tradeoffs 3.4. Verifying your DSP Builder Design with C++ Software Models 3.5. Verifying your DSP Builder Advanced Blockset Design in the ModelSim Simulator 3.6. Verifying Your DSP Builder Design in Hardware 3.7. Integrating Your DSP Builder Advanced Blockset Design into Hardware
3.1. Implementing your Design in DSP Builder Advanced Blockset x
3.1.1. Dividing your DSP Builder Design into Subsystems 3.1.2. Connecting DSP Builder Subsystems 3.1.3. Creating a New Design by Copying a DSP Builder Design Example 3.1.4. Vectorized Inputs
3.1.2. Connecting DSP Builder Subsystems x
3.1.2.1. DSP Builder Block Interface Signals 3.1.2.2. Periods 3.1.2.3. Sample Rate 3.1.2.4. Building Multichannel Systems 3.1.2.5. Channelization for Two Channels with a Folding Factor of 3 3.1.2.6. Channelization for Four Channels with a Folding Factor of 3 3.1.2.7. Synchronization and Scheduling of Data with the Channel Signal 3.1.2.8. Simulink vs Hardware Design Representations
3.1.2.1. DSP Builder Block Interface Signals x
3.1.2.1.1. Multichannel Systems with IP Library Blocks 3.1.2.1.2. Valid, Channel, and Data Examples
3.1.2.4. Building Multichannel Systems x
3.1.2.4.1. Multichannel Systems with IP Library Blocks
3.1.3. Creating a New Design by Copying a DSP Builder Design Example x
3.1.3.1. Creating a New Design From the DSP Builder FIR Design Example and Changing the Namespaces
3.2. Verifying your DSP Builder Advanced Blockset Design in Simulink and MATLAB x
3.2.1. Verifying your DSP Builder Advanced Blockset Design with a Testbench 3.2.2. Running DSP Builder Advanced Blockset Automatic Testbenches 3.2.3. Using DSP Builder Advanced Blockset References 3.2.4. Setting Up Stimulus in DSP Builder Advanced Blockset 3.2.5. Analyzing your DSP Builder Advanced Blockset Design
3.2.1. Verifying your DSP Builder Advanced Blockset Design with a Testbench x
3.2.1.1. Visualization Features
3.2.2. Running DSP Builder Advanced Blockset Automatic Testbenches x
3.2.2.1. dspba.runModelsimATB 3.2.2.2. Running All Automatic Testbenches 3.2.2.3. The command run_all_atbs Command Syntax 3.2.2.4. Testbench Error Messages
3.3. Exploring DSP Builder Advanced Blockset Design Tradeoffs x
3.3.1. Bit Growth 3.3.2. Managing Bit Growth in DSP Builder Advanced Blockset Designs 3.3.3. Using Rounding and Saturation in DSP Builder Advanced Blockset Designs 3.3.4. Scaling with Primitive Blocks 3.3.5. Changing Data Type with Convert Blocks and Specifying Output Types
3.3.5. Changing Data Type with Convert Blocks and Specifying Output Types x
3.3.5.1. The Convert Block and Real-world Values 3.3.5.2. Output Data Types on Primitive Blocks
3.4. Verifying your DSP Builder Design with C++ Software Models x
3.4.1. Software Model Options 3.4.2. Software Model Generated Files 3.4.3. Software Model Compilers 3.4.4. Compiling and Running Software Model Testbenches 3.4.5. Testing the Software Model 3.4.6. MATLAB MEX Function Wrapper for a Generated Software Model
3.4.5. Testing the Software Model x
3.4.5.1. Linking to External Libraries
3.4.6. MATLAB MEX Function Wrapper for a Generated Software Model x
3.4.6.1. Driving the Model 3.4.6.2. MEX Model Code 3.4.6.3. Complete the MEX Function 3.4.6.4. Compile, Run, and Test the MEX Function
3.5. Verifying your DSP Builder Advanced Blockset Design in the ModelSim Simulator x
3.5.1. Automatic Testbench 3.5.2. DSP Builder Advanced Blockset ModelSim Simulations
3.5.1. Automatic Testbench x
3.5.1.1. DSP Builder Advanced Blockset Automatic Testbench Files
3.6. Verifying Your DSP Builder Design in Hardware x
3.6.1. Hardware Verification
3.6.1. Hardware Verification x
3.6.1.1. Real-Time Hardware Verification Design Example
3.6.1.1. Real-Time Hardware Verification Design Example x
3.6.1.1.1. Running the Real-Time Hardware Verification Design Example
3.7. Integrating Your DSP Builder Advanced Blockset Design into Hardware x
3.7.1. DSP Builder Generated Files 3.7.2. DSP Builder Designs and the Quartus Prime Project 3.7.3. Interfaces with a Processor Bus 3.7.4. DSP Builder Designs in Platform Designer
3.7.2. DSP Builder Designs and the Quartus Prime Project x
3.7.2.1. Adding a DSP Builder Advanced Blockset Design to an Existing Quartus Prime Project
3.7.3. Interfaces with a Processor Bus x
3.7.3.1. Assigning Base Addresses in DSP Builder Designs 3.7.3.2. Updating Registers with the Nios II Processor
3.7.4. DSP Builder Designs in Platform Designer x
3.7.4.1. Integrating a DSP Builder Design to a Platform Designer System 3.7.4.2. Modifying Avalon Streaming Blocks 3.7.4.3. Restrictions for DSP Builder Designs with Avalon Streaming Interface and AXI4-Stream Blocks 3.7.4.4. Connecting Conduit Interfaces
4. Primitive Library Blocks Tutorial x
4.1. Creating a Fibonacci Design from the DSP Builder Primitive Library 4.2. Setting the Parameters on the Testbench Source Blocks 4.3. Simulating the Fibonacci Design in Simulink 4.4. Modifying the DSP Builder Fibonacci Design to Generate Vector Signals 4.5. Simulating the RTL of the Fibonacci Design
5. IP Tutorial x
5.1. Creating an IP Design 5.2. Simulating the IP Design in Simulink 5.3. Viewing Timing Closure and Viewing Resource Utilization for the DSP Builder IP Design 5.4. Reparameterizing the DSP Builder FIR Filter to Double the Number of Channels 5.5. Doubling the Target Clock Rate for a DSP Builder IP Design
6. DSP Builder for Intel FPGAs (Advanced Blockset) Design Examples and Reference Designs x
6.1. DSP Builder Design Configuration Block Design Examples 6.2. DSP Builder FFT Design Examples 6.3. DSP Builder DDC Design Example 6.4. DSP Builder Filter Design Examples 6.5. DSP Builder Finite State Machine Design Example 6.6. DSP Builder Folding Design Examples 6.7. DSP Builder Floating Point Design Examples 6.8. DSP Builder Flow Control Design Examples 6.9. DSP Builder HDL Import Design Example 6.10. DSP Builder Host Interface Design Examples 6.11. DSP Builder Fixed-Point Matrix Multiply Engine Design Example 6.12. DSP Builder Platform Design Examples 6.13. DSP Builder Primitive Block Design Examples 6.14. DSP Builder Reference Designs 6.15. DSP Builder Waveform Synthesis Design Examples
6.1. DSP Builder Design Configuration Block Design Examples x
6.1.1. Scale 6.1.2. Local Threshold
6.2. DSP Builder FFT Design Examples x
6.2.1. FFT 6.2.2. FFT without BitReverseCoreC Block 6.2.3. IFFT 6.2.4. IFFT without BitReverseCoreC Block 6.2.5. Floating-Point FFT 6.2.6. Floating-Point FFT without BitReverseCoreC Block 6.2.7. Floating-Point iFFT 6.2.8. Floating-Point iFFT without BitReverseCoreC Block 6.2.9. Multichannel FFT 6.2.10. Multiwire Transpose 6.2.11. Parallel FFT 6.2.12. Parallel Floating-Point FFT 6.2.13. Single-Wire Transpose 6.2.14. Switchable FFT/iFFT 6.2.15. Variable-Size Fixed-Point FFT 6.2.16. Variable-Size Fixed-Point FFT without BitReverseCoreC Block 6.2.17. Variable-Size Fixed-Point iFFT 6.2.18. Variable-Size Fixed-Point iFFT without BitReverseCoreC Block 6.2.19. Variable-Size Floating-Point FFT 6.2.20. Variable-Size Floating-Point FFT without BitReverseCoreC Block 6.2.21. Variable-Size Floating-Point iFFT 6.2.22. Variable-Size Floating-Point iFFT without BitReverseCoreC Block 6.2.23. Variable-Size Low-Resource FFT 6.2.24. Variable-Size Low-Resource Real-Time FFT 6.2.25. Variable-Size Supersampled FFT 6.2.26. Variable-Size Supersampled FFT with Bit-Reverse
6.3. DSP Builder DDC Design Example x
6.3.1. DDC Design Example Subsystem 6.3.2. Building the DDC Design Example
6.3.2. Building the DDC Design Example x
6.3.2.1. DDC Design Example Generated Files
6.4. DSP Builder Filter Design Examples x
6.4.1. Complex FIR Filter 6.4.2. Decimating CIC Filter 6.4.3. Decimating FIR Filter 6.4.4. Filter Chain with Forward Flow Control 6.4.5. FIR Filter with Exposed Bus 6.4.6. Fractional FIR Filter Chain 6.4.7. Fractional-Rate FIR Filter 6.4.8. Half-Band FIR Filter 6.4.9. IIR: Full-rate Fixed-point 6.4.10. IIR: Full-rate Floating-point 6.4.11. Interpolating CIC Filter 6.4.12. Interpolating FIR Filter 6.4.13. Interpolating FIR Filter with Multiple Coefficient Banks 6.4.14. Interpolating FIR Filter with Updating Coefficient Banks 6.4.15. Root-Raised Cosine FIR Filter 6.4.16. Single-Rate FIR Filter 6.4.17. Super-Sample Decimating FIR Filter 6.4.18. Super-Sample Fractional FIR Filter 6.4.19. Super-Sample Interpolating FIR Filter 6.4.20. Variable-Rate CIC Filter
6.6. DSP Builder Folding Design Examples x
6.6.1. Position, Speed, and Current Control for AC Motors 6.6.2. Position, Speed, and Current Control for AC Motors (with ALU Folding) 6.6.3. About FOC 6.6.4. Folded FIR Filter
6.7. DSP Builder Floating Point Design Examples x
6.7.1. Black-Scholes Floating Point 6.7.2. Double-Precision Real Floating-Point Matrix Multiply 6.7.3. Fine Doppler Estimator 6.7.4. Floating-Point Mandlebrot Set 6.7.5. General Real Matrix Multiply One Cycle Per Output 6.7.6. Newton Root Finding Tutorial Step 1—Iteration 6.7.7. Newton Root Finding Tutorial Step 2—Convergence 6.7.8. Newton Root Finding Tutorial Step 3—Valid 6.7.9. Newton Root Finding Tutorial Step 4—Control 6.7.10. Newton Root Finding Tutorial Step 5—Final 6.7.11. Normalizer 6.7.12. Single-Precision Complex Floating-Point Matrix Multiply 6.7.13. Single-Precision Real Floating-Point Matrix Multiply 6.7.14. Simple Nonadaptive 2D Beamformer
6.8. DSP Builder Flow Control Design Examples x
6.8.1. Avalon-ST Interface (Input and Output FIFO Buffer) with Backpressure 6.8.2. Avalon-ST Interface (Output FIFO Buffer) with Backpressure 6.8.3. Kronecker Tensor Product 6.8.4. Parallel Loops 6.8.5. Primitive FIR with Back Pressure 6.8.6. Primitive FIR with Forward Pressure 6.8.7. Primitive Systolic FIR with Forward Flow Control 6.8.8. Rectangular Nested Loop 6.8.9. Sequential Loops 6.8.10. Triangular Nested Loop
6.9. DSP Builder HDL Import Design Example x
6.9.1. Performing a Cosimulation
6.10. DSP Builder Host Interface Design Examples x
6.10.1. Memory-Mapped Registers
6.12. DSP Builder Platform Design Examples x
6.12.1. 16-Channel DDC 6.12.2. 16-Channel DUC 6.12.3. 2-Antenna DUC for WiMAX 6.12.4. 2-Channel DUC 6.12.5. Super-Sample Rate Digital Upconverter
6.13. DSP Builder Primitive Block Design Examples x
6.13.1. 8×8 Inverse Discrete Cosine Transform 6.13.2. Automatic Gain Control 6.13.3. Bit Combine for Boolean Vectors 6.13.4. Bit Extract for Boolean Vectors 6.13.5. Color Space Converter 6.13.6. CORDIC from Primitive Blocks 6.13.7. Digital Predistortion Forward Path 6.13.8. Fibonacci Series 6.13.9. Folded Vector Sort 6.13.10. Fractional Square Root Using CORDIC 6.13.11. Fixed-point Maths Functions 6.13.12. Gaussian Random Number Generator 6.13.13. Hello World 6.13.14. Hybrid Direct Form and Transpose Form FIR Filter 6.13.15. Loadable Counter 6.13.16. Matrix Initialization of LUT 6.13.17. Matrix Initialization of Vector Memories 6.13.18. Multichannel IIR Filter 6.13.19. Quadrature Amplitude Modulation 6.13.20. Reinterpret Cast for Bit Packing and Unpacking 6.13.21. Run-time Configurable Decimating and Interpolating Half-Rate FIR Filter 6.13.22. Square Root Using CORDIC 6.13.23. Test CORDIC Functions with the CORDIC Block 6.13.24. Uniform Random Number Generator 6.13.25. Vector Sort—Sequential 6.13.26. Vector Sort—Iterative 6.13.27. Vector Initialization of Sample Delay 6.13.28. Wide Single-Channel Accumulators
6.14. DSP Builder Reference Designs x
6.14.1. 1-Antenna WiMAX DDC 6.14.2. 2-Antenna WiMAX DDC 6.14.3. 1-Antenna WiMAX DUC 6.14.4. 2-Antenna WiMAX DUC 6.14.5. 4-Carrier, 2-Antenna W-CDMA DDC 6.14.6. 1-Carrier, 2-Antenna W-CDMA DDC 6.14.7. 4-Carrier, 2-Antenna W-CDMA DUC 6.14.8. 4-Carrier, 4-Antenna DUC and DDC for LTE 6.14.9. 1-Carrier, 2-Antenna W-CDMA DDC 6.14.10. 4-Carrier, 2-Antenna High-Speed W-CDMA DUC at 368.64 MHz with Total Rate Change 32 6.14.11. 4-Carrier, 2-Antenna High-Speed W-CDMA DUC at 368.64 MHz with Total Rate Change 48 6.14.12. 4-Carrier, 2-Antenna High-Speed W-CDMA DUC at 307.2 MHz with Total Rate Change 40 6.14.13. Cholesky-based Matrix Inversion 6.14.14. Cholesky Solver Multiple Channels 6.14.15. Crest Factor Reduction 6.14.16. Direct RF with Synthesizable Testbench 6.14.17. Dynamic Decimating FIR Filter 6.14.18. Multichannel QR Decompostion 6.14.19. QR Decompostion 6.14.20. QRD Solver 6.14.21. Reconfigurable Decimation Filter 6.14.22. Single-Channel 10-MHz LTE Transmitter 6.14.23. STAP Radar Forward and Backward Substitution 6.14.24. STAP Radar Steering Generation 6.14.25. STAP Radar QR Decomposition 192x204 6.14.26. Time Delay Beamformer 6.14.27. Transmit and Receive Modem 6.14.28. Variable Integer Rate Decimation Filter
6.15. DSP Builder Waveform Synthesis Design Examples x
6.15.1. Complex Mixer 6.15.2. Four Channel, Two Banks NCO 6.15.3. Four Channel, Four Banks NCO 6.15.4. Four Channel, Eight Banks, Two Wires NCO 6.15.5. Four Channel, 16 Banks NCO 6.15.6. IP 6.15.7. NCO 6.15.8. NCO with Exposed Bus 6.15.9. Real Mixer 6.15.10. Super-sample NCO
7. DSP Builder Design Rules, Design Recommendations, and Troubleshooting x
7.1. DSP Builder Design Rules and Recommendations 7.2. Troubleshooting DSP Builder Designs
7.2. Troubleshooting DSP Builder Designs x
7.2.1. About Loops 7.2.2. Closing Timed feedback Loops 7.2.3. Loops, Clock Cycles, and Data Cycles
8. About DSP Builder for Intel FPGAs Optimization x
8.1. Associating DSP Builder with MATLAB 8.2. Setting Up Simulink for DSP Builder Designs 8.3. The DSP Builder Windows Shortcut 8.4. Setting DSP Builder Design Parameters with MATLAB Scripts 8.5. Managing your Designs 8.6. How to Manage Latency 8.7. Flow Control in DSP Builder Designs 8.8. Reset Minimization 8.9. About Importing HDL
8.2. Setting Up Simulink for DSP Builder Designs x
8.2.1. Setting Up Simulink Solver 8.2.2. Setting Up Simulink Signal Display Option
8.4. Setting DSP Builder Design Parameters with MATLAB Scripts x
8.4.1. Running Setup Scripts Automatically 8.4.2. Defining Unique DSP Builder Design Parameters 8.4.3. Example DSP Builder Custom Scripts
8.5. Managing your Designs x
8.5.1. Managing Basic Parameters 8.5.2. Creating User Libraries and Converting a Primitive Subsystem into a Custom Block 8.5.3. Revision Control
8.6. How to Manage Latency x
8.6.1. Reading the Added Latency Value for an IP Block 8.6.2. Zero Latency Example 8.6.3. Implicit Delays in DSP Builder Designs 8.6.4. Distributed Delays in DSP Builder Designs 8.6.5. Latency and fMAX Constraint Conflicts in DSP Builder Designs 8.6.6. Control Units Delays
9. About Folding x
9.1. ALU Folding 9.2. Removing Resource Sharing Folding
9.1. ALU Folding x
9.1.1. ALU Folding Limitations 9.1.2. ALU Folding Parameters 9.1.3. ALU Folding Simulation Rate 9.1.4. Using ALU Folding 9.1.5. Using Automated Verification 9.1.6. Ready Signal 9.1.7. Connecting the ALU Folding Ready Signal 9.1.8. About the ALU Folding Start of Packet Signal
10. Floating-Point Data Types x
10.1. DSP Builder Floating-Point Data Type Features 10.2. DSP Builder Supported Floating-Point Data Types 10.3. DSP Builder Round-Off Errors 10.4. Trading Off Logic Utilization and Accuracy in DSP Builder Designs 10.5. Upgrading Pre v14.0 Designs 10.6. Floating-Point Sine Wave Generator Tutorial 10.7. Newton-Raphson Root Finding Tutorial 10.8. Forcing Soft Floating-point Data Types with the Advanced Options
10.6. Floating-Point Sine Wave Generator Tutorial x
10.6.1. Creating a Sine Wave Generator in DSP Builder 10.6.2. Using Data Type Variables to Parameterize Designs 10.6.3. Using Data-Type Propagation in DSP Builder Designs 10.6.4. DSP Builder Testbench Verification
10.6.4. DSP Builder Testbench Verification x
10.6.4.1. Tuning ATB Thresholds 10.6.4.2. Writing Application Specific Verification 10.6.4.3. Bit-Accurate Simulation 10.6.4.4. Adder Trees and Scalar Products 10.6.4.5. Creating Floating-Point Accumulators for Designs that Use Iteration
10.7. Newton-Raphson Root Finding Tutorial x
10.7.1. Implementing the Newton Design 10.7.2. Improving DSP Builder Floating-Point Designs
11. Design Configuration Library x
11.1. Avalon Memory-Mapped Agent Settings (AvalonMemoryMappedAgentSettings) 11.2. Control 11.3. Device 11.4. LocalThreshold
11.2. Control x
11.2.1. DSP Builder Memory and Multiplier Trade-Off Options
12. IP Library x
12.1. Channel Filter and Waveform Library 12.2. Dependent Delay Library 12.3. FFT IP Library
12.1. Channel Filter and Waveform Library x
12.1.1. DSP Builder FIR and CIC Filters 12.1.2. DSP Builder FIR Filters 12.1.3. Channel Viewer (ChanView) 12.1.4. Complex Mixer (ComplexMixer) 12.1.5. Decimating CIC 12.1.6. Decimating FIR 12.1.7. Fractional Rate FIR 12.1.8. Interpolating CIC 12.1.9. Interpolating FIR 12.1.10. NCO 12.1.11. Real Mixer (Mixer) 12.1.12. Scale 12.1.13. Single-Rate FIR
12.1.1. DSP Builder FIR and CIC Filters x
12.1.1.1. Common CIC and FIR Filter Features 12.1.1.2. Updated Help 12.1.1.3. Half-Band and L-Band Nyquist FIR Filters 12.1.1.4. Parameterization of CIC and FIR Filters 12.1.1.5. Setting and Changing FIR Filter Coefficients at Runtime in DSP Builder
12.1.2. DSP Builder FIR Filters x
12.1.2.1. FIR Filter Avalon-MM Interfaces 12.1.2.2. Reconfigurable FIR Filters 12.1.2.3. FIR Filter Coefficient Sharing 12.1.2.4. FIR Filter Reset
12.1.10. NCO x
12.1.10.1. NCO Block Phase Increment and Inversion 12.1.10.2. NCO Block Phase Increment Memory Registers 12.1.10.3. NCO Block Frequency Hopping
12.2. Dependent Delay Library x
12.2.1. Dependent Latency Expressions
12.3. FFT IP Library x
12.3.1. Bit Reverse Core C (BitReverseCoreC and VariableBitReverse) 12.3.2. FFT (FFT, FFT_Light, VFFT, VFFT_Light)
13. Interfaces Library x
13.1. Memory-Mapped Library 13.2. Streaming Library
13.1. Memory-Mapped Library x
13.1.1. Bus Slave (BusSlave) 13.1.2. Bus Stimulus (BusStimulus) 13.1.3. Bus Stimulus File Reader (Bus StimulusFileReader) 13.1.4. External Memory, Memory Read, Memory Write 13.1.5. Register Bit (RegBit) 13.1.6. Register Field (RegField) 13.1.7. Register Out (RegOut) 13.1.8. Shared Memory (SharedMem)
13.2. Streaming Library x
13.2.1. Avalon-ST Input (AStInput) 13.2.2. Avalon-ST Input FIFO Buffer (AStInputFIFO) 13.2.3. Avalon-ST Output (AStOutput) 13.2.4. AXI4-Stream Blocks (AXI4StreamReceiver and AXI4StreamTransmitter)
14. Primitives Library x
14.1. Vector and Complex Type Support 14.2. DFT Design Elements Library 14.3. FFT Design Elements Library 14.4. Primitive Basic Blocks Library 14.5. Primitive Configuration Library 14.6. Primitive Design Elements Library
14.1. Vector and Complex Type Support x
14.1.1. Vector Type Support 14.1.2. Complex Support
14.1.1. Vector Type Support x
14.1.1.1. Element by Element Mode 14.1.1.2. Mathematical Vector Mode 14.1.1.3. Interactions with Simulink
14.1.2. Complex Support x
14.1.2.1. Interactions with Simulink
14.2. DFT Design Elements Library x
14.2.1. DFT (DFT) 14.2.2. Reorder (ReorderBlock) 14.2.3. Reorder and Rescale (ReorderAndRescale)
14.3. FFT Design Elements Library x
14.3.1. About Pruning and Twiddle for FFT Blocks 14.3.2. Bit Vector Combine (BitVectorCombine) 14.3.3. Butterfly Unit (BFU) 14.3.4. Butterfly I C (BFIC) (Deprecated) 14.3.5. Butterfly II C (BFIIC) (Deprecated) 14.3.6. Choose Bits (ChooseBits) 14.3.7. Crossover Switch (XSwitch) 14.3.8. Dual Twiddle Memory (DualTwiddleMemoryC) 14.3.9. Edge Detect (EdgeDetect) 14.3.10. Floating-Point Twiddle Generator (TwiddleGenF) (Deprecated) 14.3.11. Fully-Parallel FFTs (FFT2P, FFT4P, FFT8P, FFT16P, FFT32P, and FFT64P) 14.3.12. Fully-Parallel FFTs with Flexible Ordering (FFT2X, FFT4X, FFT8X, FFT16X, FFT32X, and FFT64X) 14.3.13. General Multitwiddle and General Twiddle (GeneralMultiTwiddle, GeneralMultVTwiddle, GeneralTwiddle, GeneralVTwiddle) 14.3.14. Hybrid FFT (Hybrid_FFT, HybridVFFT, HybridVFFT_btb) 14.3.15. Multiwire Transpose (MultiwireTranspose) 14.3.16. Multiwire Variable Bit Reverse (MultiwireVariableBitReverse) 14.3.17. Parallel Pipelined FFT (PFFT_Pipe) 14.3.18. Pulse Divider (PulseDivider) 14.3.19. Pulse Multiplier (PulseMultiplier) 14.3.20. Single-Wire Transpose (Transpose) 14.3.21. Split Scalar (SplitScalar) 14.3.22. Streaming FFTs (FFT2, FFT4, VFFT2, and VFFT4) 14.3.23. Stretch Pulse (StretchPulse) 14.3.24. Twiddle Angle (TwiddleAngle) 14.3.25. Twiddle Generator (TwiddleGenC) Deprecated 14.3.26. Twiddle and Variable Twiddle (Twiddle and VTwiddle) 14.3.27. Twiddle ROM (TwiddleRom, TwiddleMultRom and TwiddleRomF (deprecated))
14.4. Primitive Basic Blocks Library x
14.4.1. Absolute Value (Abs) 14.4.2. Accumulator (Acc) 14.4.3. Add 14.4.4. Add SLoad (AddSLoad) 14.4.5. AddSub 14.4.6. AddSubFused 14.4.7. AND Gate (And) 14.4.8. Bit Combine (BitCombine) 14.4.9. Bit Extract (BitExtract) 14.4.10. Bit Reverse (BitReverse) 14.4.11. Compare (CmpCtrl) 14.4.12. Complex Conjugate (ComplexConjugate) 14.4.13. Compare Equality (CmpEQ) 14.4.14. Compare Greater Than (CmpGE) 14.4.15. Compare Less Than (CmpLT) 14.4.16. Compare Not Equal (CmpNE) 14.4.17. Constant (Const) 14.4.18. Constant Multiply (Const Mult) 14.4.19. Convert 14.4.20. CORDIC 14.4.21. Counter 14.4.22. Count Leading Zeros, Ones, or Sign Bits (CLZ) 14.4.23. Dual Memory (DualMem) 14.4.24. Demultiplexer (Demux) 14.4.25. Divide 14.4.26. Fanout 14.4.27. FIFO 14.4.28. Floating-point Classifier (FloatClass) 14.4.29. Floating-point Multiply Accumulate (MultAcc) 14.4.30. ForLoop 14.4.31. Load Exponent (LdExp) 14.4.32. Left Shift (LShift) 14.4.33. Loadable Counter (LoadableCounter) 14.4.34. Look-Up Table (Lut) 14.4.35. Loop 14.4.36. Math 14.4.37. Minimum and Maximum (MinMax) 14.4.38. MinMaxCtrl 14.4.39. Multiply (Mult) 14.4.40. Multiplexer (Mux) 14.4.41. NAND Gate (Nand) 14.4.42. Negate 14.4.43. NOR Gate (Nor) 14.4.44. NOT Gate (Not) 14.4.45. OR Gate (Or) 14.4.46. Polynomial 14.4.47. Ready 14.4.48. Reinterpret Cast (ReinterpretCast) 14.4.49. Round 14.4.50. Sample Delay (SampleDelay) 14.4.51. Scalar Product 14.4.52. Select 14.4.53. Sequence 14.4.54. Shift 14.4.55. Sqrt 14.4.56. Subtract (Sub) 14.4.57. Sum of Elements (SumOfElements) 14.4.58. Trig 14.4.59. XNOR Gate (Xnor) 14.4.60. XOR Gate (Xor)
14.5. Primitive Configuration Library x
14.5.1. Channel In (ChannelIn) 14.5.2. Channel Out (ChannelOut) 14.5.3. General Purpose Input (GPIn) 14.5.4. General Purpose Output (GPOut) 14.5.5. Synthesis Information (SynthesisInfo)
14.5.5. Synthesis Information (SynthesisInfo) x
14.5.5.1. Scheduled Synthesis 14.5.5.2. Updated Help
14.6. Primitive Design Elements Library x
14.6.1. Anchored Delay 14.6.2. Complex to Real-Imag 14.6.3. Enabled Delay Line 14.6.4. Enabled Feedback Delay 14.6.5. Expand Scalar (ExpandScalar) 14.6.6. Finite State Machine 14.6.7. Nested Loops (NestedLoop1, NestedLoop2, NestedLoop3) 14.6.8. Pause 14.6.9. Reset-Priority Latch (SRlatch_PS) 14.6.10. Same Data Type (SameDT) 14.6.11. Set-Priority Latch (SRlatch) 14.6.12. Single-Cycle Latency Latch (latch_1L) 14.6.13. Tapped Line Delay (TappedLineDelay) 14.6.14. Variable Super-Sample Delay (VariableDelay) 14.6.15. Vector Fanout (VectorFanout) 14.6.16. Vector Multiplexer (VectorMux) 14.6.17. Zero-Latency Latch (latch_0L)
14.6.6. Finite State Machine x
14.6.6.1. Adding a Finite State Machine Block to your DSP Builder Design 14.6.6.2. Modifying the Finite State Machine Block Specification File 14.6.6.3. Implement Token Passing with the Finite State Machine 14.6.6.4. Implementing a One Shot Counter with the Finite State Machine 14.6.6.5. Specifying ForLoop Control Units 14.6.6.6. Creating the Finite State Machine Configuration File 14.6.6.7. Upgrading Finite State Machine Blocks from v23.2 and Earlier
15. Utilities Library x
15.1. Analyze and Test Library 15.2. HDL Import Library 15.3. Beta Blocks Library
15.1. Analyze and Test Library x
15.1.1. Capture Values 15.1.2. Dechannelizer 15.1.3. Channelizer 15.1.4. Display Resources 15.1.5. Edit Params 15.1.6. Pause
15.2. HDL Import Library x
15.2.1. HDL Import 15.2.2. HDL Import Config
15.3. Beta Blocks Library x
15.3.1. SYCL
15.3.1. SYCL x
15.3.1.1. Implementing a SYCL Block
Answers to Top FAQs
1. About DSP Builder for Intel® FPGAs
2. DSP Builder for Intel FPGAs Advanced Blockset Getting Started
3. DSP Builder Design Flow
4. Primitive Library Blocks Tutorial
5. IP Tutorial
6. DSP Builder for Intel FPGAs (Advanced Blockset) Design Examples and Reference Designs
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14.3.14. Hybrid FFT (Hybrid_FFT, HybridVFFT, HybridVFFT_btb)

The hybrid FFT blocks implement a hybrid serial or parallel implementation of a supersampled FFT (or IFFT) that processes 2M points per cycle (where M>0).

The hybrid FFT has a parallel section and an optional serial section. You control the length of the serial section by a parameter. Generally, the serial section is more memory-efficient and the parallel section is more DSP-efficient. Therefore, changing the value of this parameter provides a trade-off between DSP memory usage and block usage. The hybrid FFT includes three blocks:

  • Fixed size Hybrid_FFT
  • Variable size HybridVFFT
  • Variable size back-to-back HybridVFFT_btb

HybridVFFT and HybridVFFT_btb have different behaviours when the FFT size changes. Different size FFTs take different numbers of cycles to compute, so that, without additional measures, the smaller FFT overtakes the tail of the larger FFT and the output is corrupted. In this situation, DSP Builder can:

  • Stop-and-flush. Depending on the current size, you can bypass certain stages of the FFT pipeline. You must ensure a sufficient gap between inputs of different size so that no overtaking occurs.
  • Queue-and-wait. All FFTs take the same number of cycles. Smaller FFTs, instead of bypassing parts of the pipeline, just go through delay lines in the stages that don't affect them. You have no constraints on providing gaps in the input.

The HybridVFFT uses stop-and-flush, which achieves the lowest possible latency for small FFTs. HybridVFFT_btb uses queue-and-wait. It can process FFTs continuously, with no breaks required when the FFT size changes, and no busy periods when it cannot accept new inputs.

The demo_variable_hybridfft.mdl example design demonstrates HybridVFFT.

The demo_variable_hybridfft_backtoback.mdl example design demonstrates HybridVFFT_btb.

Table 127.  Common Parameters for the Hybrid_FFT, HybridVFFT and HybridVFFT_btb Blocks
Parameter Description
IFFT

Specify if the operation is an FFT or an inverse FFT.

Specify true for an inverse FFT; false for an FFT.
Bit-reversed input

Specify if the input is in natural or bit-reversed order.

Specify true for the IP to receive its input in bit-reversed order and to produce its output in natural order. Specify false for the IP to receive its input in natural order and to produce its output in bit-reversed order.

M Specify the number of parallel inputs/wires where the number of wires is 2 M . For example, a value of 1 means 2 parallel data inputs and a value of 5 means 32 parallel data inputs.
Input type

Input Type is the MATLAB type of the input data. For example, fixdt(1,16,15) or single.
Twiddle/pruning specification Refer to About Pruning and Twiddle for FFT Blocks section.
Optimize twiddle memory usage

Specify whether the block should reduce twiddle memory at the expense of other resources such as logic and DSP blocks.

Specify true to reduce memory.
Use faithful rounding

Specify whether the block should use faithful or correct rounding for floating point operations. Specify true for faithful rounding and false for correct rounding.

This parameter allows you to trade-off accuracy against resource usage. Select correct rounding for maximum accuracy and faithful rounding for reduced resource usage.

DSP Builder ignores this parameter for fixed-point operations.
Table 128.  Additional Parameters for the HybridVFFT Block
Parameter Description
N

Specify the size of the FFT where the FFT size is 2 N .

For example, a value of 2 represents a 4 point FFT and 16 represents a 64K point FFT.

N cannot be smaller than M.

Number of serial stages

Specify the number of serial stages of the hybrid architecture.

The hybrid architecture consists of zero-or-more serial stages combined with one-or-more parallel stages.

This number controls the architecture that implements the FFT and affects its resource usage and latency.

Number of serial stages must be in the range 0 to N-M.

Table 129.  Additional Parameters for the HybridVFFT_btb Block
Parameter Description
maxsize

Specify the maximum size of the FFT, where the maximum size of the FFT is 2 maxsize .

For example, a value of 2 represents a 4 point FFT and 16 represents a 64K point FFT.
minsize

Specify minimum the size of the FFT, where the minimum size of the FFT is 2 minsize .

For example, a value of 0 represents a 1 point FFT and 16 represents a 64K point FFT.

minsize cannot be smaller than M.

Number of serial stages for maximum FFT size

Specify the number of serial stages of the hybrid architecture.

The hybrid architecture consists of zero-or-more serial stages combined with one-or-more parallel stages.

This number controls the architecture that implements the FFT and affects its resource usage and latency.

The serial stages implement the variability of the FFT. Ensure the design has at least (maxsize – minsize) number of serial stages for the maximum FFT size.

Number of serial stages for maximum FFT size must be in the range (maxsize-minsize) to maxsize-M.

Table 130.  Common Port Interfaces for the Hybrid_FFT, HybridVFFT, and HybridVFFT_btb Blocks
Signal Direction Type Description
v Input Boolean.

Data valid signal. Assert this signal when input data is valid.

This signal must not deassert during an FFT. Keep it asserted from the first input to last input of an FFT.
d Input As specified by Input Type.

Data input signal.

A vector of complex input data signals of the user-specified type (Input Type).

qv Output Boolean. Data valid signal. The block asserts this signal for valid output data.
q Output Determined by pruning specification.

Data output signal.

A vector of complex output data signals of the user-specified type (Input Type).

Table 131.  Additional Port Interface for the HybridVFFT Block
Signal Direction Type Description
size Input

Unsigned integer.

Width is determined by maxsize.

The size of the current FFT, where the FFT size is 2 size . For example, a value of 2 represents a 4-point FFT and 16 represents a 64K-point FFT.

The size must be within the user specified range of minsize and maxsize.

Table 132.  Additional Port Interfaces for the HybridVFFT_btb Block
Signal Direction Type Description
size Input

Unsigned integer.

Width is determined by maxsize.

The size of the current FFT, where the FFT size is 2 size . For example, a value of 2 represents a 4-point FFT and 16 represents a 64K-point FFT.

The size must be within the user specified range of minsize and maxsize.

sop Input Boolean

Start of packet signal.

Use this signal to indicate the start of an FFT input frame.

This signal must be high for one cycle at the start of a frame.
qsize Output

Unsigned integer.

Width is determined by maxsize.

The size of the current FFT, where the size of FFT is 2 qsize

For example, a value of 2 represents a 4 point FFT and 16 represents a 64K point FFT.
qsop Output Boolean

Start of packet signal.

The block asserts this Boolean signal on the first (and only the first) valid output of an FFT/IFFT.
Related Information
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