Agilex™ 7 Variable Precision DSP Blocks User Guide

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ID 683037
Date 8/06/2025
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Document Table of Contents
Document Table of Contents x
1. Agilex™ 7 Variable Precision DSP Blocks Overview 2. Agilex™ 7 Variable Precision DSP Blocks Architecture 3. Agilex™ 7 Variable Precision DSP Blocks Operational Modes 4. Agilex™ 7 Variable Precision DSP Blocks Design Considerations 5. Native Fixed Point DSP Intel Agilex® FPGA IP Core References 6. Multiply Adder Intel® FPGA IP Core References 7. ALTMULT_COMPLEX Intel® FPGA IP Core References 8. LPM_MULT Intel® FPGA IP Core References 9. LPM_DIVIDE Intel® FPGA IP Core References 10. Native Floating Point DSP Intel Agilex® FPGA IP References 11. Agilex™ 7 Variable Precision DSP Blocks User Guide Archives 12. Document Revision History for the Agilex™ 7 Variable Precision DSP Blocks User Guide
1. Agilex™ 7 Variable Precision DSP Blocks Overview x
1.1. Features 1.2. Supported Operational Modes in Agilex™ 7 Devices
1.2. Supported Operational Modes in Agilex™ 7 Devices x
1.2.1. Fixed-point Arithmetic 1.2.2. Floating-point Arithmetic
2. Agilex™ 7 Variable Precision DSP Blocks Architecture x
2.1. Fixed-point Arithmetic 2.2. Floating-point Arithmetic
2.1. Fixed-point Arithmetic x
2.1.1. Input Register Bank for Fixed-point Arithmetic 2.1.2. Pipeline Registers for Fixed-point Arithmetic 2.1.3. Pre-adder for Fixed-point Arithmetic 2.1.4. Internal Coefficient for Fixed-point Arithmetic 2.1.5. Multipliers for Fixed-point Arithmetic 2.1.6. Adder or Subtractor for Fixed-point Arithmetic 2.1.7. Accumulator, Chainout Adder, and Preload Constant for Fixed-point Arithmetic 2.1.8. Systolic Register for Fixed-point Arithmetic 2.1.9. Double Accumulation Register for Fixed-point Arithmetic 2.1.10. Output Register Bank for Fixed-point Arithmetic
2.2. Floating-point Arithmetic x
2.2.1. Input Register Bank for Floating-point Arithmetic 2.2.2. Pipeline Registers for Floating-point Arithmetic 2.2.3. Multipliers for Floating-point Arithmetic 2.2.4. Adder or Subtractor for Floating-point Arithmetic 2.2.5. Output Register Bank for Floating-point Arithmetic 2.2.6. Exception Handling for Floating-point Arithmetic
3. Agilex™ 7 Variable Precision DSP Blocks Operational Modes x
3.1. Operational Modes for Fixed-point Arithmetic 3.2. Operational Modes for Floating-point Arithmetic
3.1. Operational Modes for Fixed-point Arithmetic x
3.1.1. Independent Multiplier Mode 3.1.2. 8 x 8 (Unsigned) or 9 x 9 (Signed) Sum of 4 Mode 3.1.3. Multiplier Adder Sum Mode 3.1.4. Independent Complex Multiplier 3.1.5. Systolic FIR Mode
3.1.1. Independent Multiplier Mode x
3.1.1.1. 18 × 18 or 18 × 19 Independent Multiplier 3.1.1.2. 27 × 27 Independent Multiplier
3.1.4. Independent Complex Multiplier x
3.1.4.1. 18 × 19 Multiplication Summed with 36-Bit Input Mode
3.1.5. Systolic FIR Mode x
3.1.5.1. Mapping Systolic Mode User View to Variable Precision Block Architecture View 3.1.5.2. 18-bit Systolic FIR Mode 3.1.5.3. 27-Bit Systolic FIR Mode
3.2. Operational Modes for Floating-point Arithmetic x
3.2.1. FP32 Single-precision Floating-point Arithmetic Functions 3.2.2. FP16 Half-precision Floating-point Arithmetic Functions 3.2.3. Multiple Floating-point Variable DSP Blocks Functions
3.2.1. FP32 Single-precision Floating-point Arithmetic Functions x
3.2.1.1. FP32 Multiplication Mode 3.2.1.2. Adder or Subtract Mode 3.2.1.3. Multiply Accumulate Mode 3.2.1.4. FP32 Vector One Mode 3.2.1.5. FP32 Vector Two Mode
3.2.2. FP16 Half-precision Floating-point Arithmetic Functions x
3.2.2.1. FP16 Supported Precision Formats 3.2.2.2. Sum of Two FP16 Multiplication Mode 3.2.2.3. Sum of Two FP16 Multiplication with FP32 Addition Mode 3.2.2.4. Sum of Two FP16 Multiplication with Accumulation Mode 3.2.2.5. FP16 Vector One Mode 3.2.2.6. FP16 Vector Two Mode 3.2.2.7. FP16 Vector Three Mode
3.2.3. Multiple Floating-point Variable DSP Blocks Functions x
3.2.3.1. Multiply-Add or Multiply-Subtract Mode 3.2.3.2. Direct Vector Dot Product 3.2.3.3. Complex Multiplication
4. Agilex™ 7 Variable Precision DSP Blocks Design Considerations x
4.1. Fixed-point Arithmetic 4.2. Floating-point Arithmetic 4.3. DSP Block Cascade Limit in Agilex™ 7 Devices
4.1. Fixed-point Arithmetic x
4.1.1. Configurations for Input, Pipeline, and Output Registers 4.1.2. Internal Coefficient and Pre-Adder for Fixed-point Arithmetic 4.1.3. Accumulator for Fixed-point Arithmetic 4.1.4. Input Cascade for Fixed-point Arithmetic 4.1.5. Chainout Adder/Accumulator Feature
4.1.1. Configurations for Input, Pipeline, and Output Registers x
4.1.1.1. Restrictions for Input Registers 4.1.1.2. Restrictions for Pipeline Registers 4.1.1.3. Supported Register Configurations per Operation Modes
4.1.4. Input Cascade for Fixed-point Arithmetic x
4.1.4.1. Dynamic Scanin
4.2. Floating-point Arithmetic x
4.2.1. Configurations for Input, Pipeline, and Output Registers 4.2.2. Chainout Adder
4.2.1. Configurations for Input, Pipeline, and Output Registers x
4.2.1.1. FP32 Operation Modes Supported Register Configurations 4.2.1.2. FP16 Operation Mode Supported Register Configurations
5. Native Fixed Point DSP Intel Agilex® FPGA IP Core References x
5.1. Native Fixed Point DSP Intel Agilex® FPGA IP Release Information 5.2. Supported Operational Modes 5.3. Maximum Input Data Width for Fixed-point Arithmetic 5.4. Maximum Output Data Width for Fixed-point Arithmetic 5.5. Parameterizing Native Fixed Point DSP IP 5.6. Native Fixed Point DSP Intel Agilex® FPGA IP Signals 5.7. IP Migration
5.3. Maximum Input Data Width for Fixed-point Arithmetic x
5.3.1. Using Less Than 36-Bit Operand In 18 x 18 Plus 36 Mode Example
5.5. Parameterizing Native Fixed Point DSP IP x
5.5.1. Operation Mode Tab 5.5.2. Input Cascade Tab 5.5.3. Pre-adder Tab 5.5.4. Internal Coefficient Tab 5.5.5. Accumulator/Output Chaining 5.5.6. Pipelining 5.5.7. Clear Signal
5.6. Native Fixed Point DSP Intel Agilex® FPGA IP Signals x
5.6.1. 9 × 9 Sum of 4 Mode Signals 5.6.2. 18 × 18 Full Mode Signals 5.6.3. 18 × 18 Sum of Two Mode Signals 5.6.4. 18 × 18 Plus 36 Mode Signals 5.6.5. 18 × 18 Systolic Mode Signals 5.6.6. 27 × 27 Mode Signals
6. Multiply Adder Intel® FPGA IP Core References x
6.1. Multiply Adder Intel® FPGA IP Release Information 6.2. Features 6.3. Parameters 6.4. Signals
6.2. Features x
6.2.1. Pre-adder 6.2.2. Systolic Delay Register 6.2.3. Pre-load Constant 6.2.4. Double Accumulator
6.2.1. Pre-adder x
6.2.1.1. Pre-adder Simple Mode 6.2.1.2. Pre-adder Coefficient Mode 6.2.1.3. Pre-adder Input Mode 6.2.1.4. Pre-adder Square Mode 6.2.1.5. Pre-adder Constant Mode
6.3. Parameters x
6.3.1. General Tab 6.3.2. Extra Modes 6.3.3. Multipliers Tab 6.3.4. Preadder Tab 6.3.5. Accumulator Tab 6.3.6. Systolic/Chainout Tab 6.3.7. Pipelining Tab
7. ALTMULT_COMPLEX Intel® FPGA IP Core References x
7.1. ALTMULT_COMPLEX Intel® FPGA IP Release Information 7.2. Features 7.3. Complex Multiplication 7.4. Parameters 7.5. Signals
8. LPM_MULT Intel® FPGA IP Core References x
8.1. LPM_MULT Intel® FPGA IP Release Information 8.2. Features 8.3. Parameters 8.4. Signals
8.3. Parameters x
8.3.1. General Tab 8.3.2. General 2 Tab 8.3.3. Pipelining Tab
9. LPM_DIVIDE Intel® FPGA IP Core References x
9.1. LPM_DIVIDE Intel® FPGA IP Release Information 9.2. Features 9.3. Verilog HDL Prototype 9.4. VHDL Component Declaration 9.5. VHDL LIBRARY_USE Declaration 9.6. Ports 9.7. Parameters
9.7. Parameters x
9.7.1. General Tab 9.7.2. General1 Tab
10. Native Floating Point DSP Intel Agilex® FPGA IP References x
10.1. Native Floating Point DSP Intel Agilex® FPGA IP Release Information 10.2. Native Floating Point DSP Intel Agilex® FPGA IP Core Supported Operational Modes 10.3. Parameterizing the Native Floating Point DSP Intel Agilex® FPGA IP 10.4. Native Floating Point DSP Intel Agilex® FPGA IP Core Signals 10.5. IP Migration
10.3. Parameterizing the Native Floating Point DSP Intel Agilex® FPGA IP x
10.3.1. General Tab 10.3.2. Registers Tab
10.4. Native Floating Point DSP Intel Agilex® FPGA IP Core Signals x
10.4.1. FP32 Multiplication Mode Signals 10.4.2. FP32 Addition or Subtraction Mode Signals 10.4.3. FP32 Multiplication with Addition or Subtraction Mode Signals 10.4.4. FP32 Multiplication with Accumulation Mode Signals 10.4.5. FP32 Vector One and Vector Two Modes Signals 10.4.6. Sum of Two FP16 Multiplication Mode Signals 10.4.7. Sum of Two FP16 Multiplication with FP32 Addition Mode Signals 10.4.8. Sum of Two FP16 Multiplication with Accumulation Mode Signals 10.4.9. FP16 Vector One and Vector Two Modes Signals 10.4.10. FP16 Vector Three Mode Signals
1. Agilex™ 7 Variable Precision DSP Blocks Overview
2. Agilex™ 7 Variable Precision DSP Blocks Architecture
3. Agilex™ 7 Variable Precision DSP Blocks Operational Modes
4. Agilex™ 7 Variable Precision DSP Blocks Design Considerations
5. Native Fixed Point DSP Intel Agilex® FPGA IP Core References
6. Multiply Adder Intel® FPGA IP Core References
7. ALTMULT_COMPLEX Intel® FPGA IP Core References
8. LPM_MULT Intel® FPGA IP Core References
9. LPM_DIVIDE Intel® FPGA IP Core References
10. Native Floating Point DSP Intel Agilex® FPGA IP References
11. Agilex™ 7 Variable Precision DSP Blocks User Guide Archives
12. Document Revision History for the Agilex™ 7 Variable Precision DSP Blocks User Guide

12. Document Revision History for the Agilex™ 7 Variable Precision DSP Blocks User Guide

Document Version Quartus® Prime Version Changes
2025.08.06 24.3.1
  • Updated sections to remove Dynamic Chainout feature:
    • Features
    • Input Register Bank for Fixed-point Arithmetic
2025.03.13 24.3.1
  • Updated section:
    • Using Less Than 36-Bit Operand In 18 x 18 Plus 36 Mode Example
  • Updated Table:
    • Internal Coefficient Configuration
    • Pipelining Tab
    • ALTMULT_COMPLEX Intel® FPGA IP Input Signals
    • Operational Modes Supported by Native Floating Point DSP Intel Agilex® FPGA IP Core
  • Updated Exception Flag Signals table for:
    • FP32 Multiplication with Addition or Subtraction Mode Signals
    • FP32 Multiplication with Accumulation Mode Signals
    • FP32 Vector One and Vector Two Modes Signals
    • Sum of Two FP16 Multiplication Mode Signals
    • Sum of Two FP16 Multiplication with FP32 Addition Mode Signals
    • Sum of Two FP16 Multiplication with Accumulation Mode Signals
    • FP16 Vector One and Vector Two Modes Signals
    • FP16 Vector Three Mode Signals
  • Added Chainout Adder/Accumulator Feature section
  • Removed section:
    • Dynamic Chainout
    • Chainout Adder
  • Updated section to remove Dynamic Chainout support:
    • Fixed-point Arithmetic
    • Accumulator, Chainout Adder, and Preload Constant for Fixed-point Arithmetic
    • Dynamic Scanin
    • Native Fixed Point DSP Intel Agilex® FPGA IP Core References
    • Accumulator/Output Chaining
    • 9 × 9 Sum of 4 Mode Signals
    • 18 × 18 Sum of Two Mode Signals
    • 18 × 18 Plus 36 Mode Signals
    • 18 × 18 Systolic Mode Signals
    • 27 × 27 Mode Signals
2023.10.02 23.3
  • Added IP Migration topics in the following sections:
    • Native Fixed Point DSP Intel Agilex® FPGA IP Core References
    • Native Floating Point DSP Intel Agilex® FPGA IP References
  • Added description about the family independent IP in the following topics:
    • Multiply Adder Intel® FPGA IP Core References
    • ALTMULT_COMPLEX Intel® FPGA IP Reference
    • LPM_MULT Intel® FPGA IP References
  • Made minor editorial edits throughout the document.
2023.04.11 23.1
  • Updated product family name to Intel Agilex® 7.
2022.11.17 21.2 Corrected legend 7 in the Location of Pipeline Register for FP32 Operation Modes figure from "fp32_mult_b_clken" to "mult_pipeline_clken".
2021.08.13 21.2
  • Added the DSP Block Cascade Limit in Intel® Agilex™ Devices topic.
  • Removed the statements about the number of DSP blocks you can cascade as systolic FIR structure in the following topics:
    • 18-bit Systolic FIR Mode
    • 27-Bit Systolic FIR Mode
  • In the 27-Bit Systolic FIR Mode topic, removed the "Systolic registers are not required in this mode" statement. The registers are not available in the 27-bit systolic FIR mode.
  • Fixed broken links and updated related information sections throughout the document.
2021.02.05 20.3 Clarified that bfloat16 is Brain Floating Point in the Features topic.
2020.09.28 20.3
  • Updated the supported registers for 18 × 19 systolic mode in the Supported Register Configurations per Operation Modes table.
  • Updated guidelines when using systolic register in fixed-point arithmetic in the Systolic Register for Fixed-point Arithmetic topic.
2020.04.26 20.1
  • Updated values for Which multiplier implementation should be used? parameter for the LPM_MULT IP core.
2020.04.13 20.1
  • Removed chainin output feature from footnote (5) in the Supported Register Configurations per Operation Modes table.
2019.09.30 19.3
  • Clarified that input and output registers for fixed-point arithmetic are not reset after power up and users need to clear the registers manually before starting an operation.
  • Updated equation for the following operation modes:
    • FP32 Multiplication with Accumulation
    • Sum of Two FP16 Multiplication with Accumulation
  • Updated the Supported Register Configurations per Operation Modes table in the Configurations for Input, Pipeline, and Output Registers topic for fixed-point arithmetic.
  • Added information for Native Fixed Point DSP Intel® Agilex™ FPGA IP version 19.1.1.
  • Added information for Native Floating Point DSP Intel® Agilex™ FPGA IP version 19.1.0
  • Added information for ALTMULT_COMPLEX Intel® FPGA IP version 19.1.0
  • Added information for LPM_DIVIDE Intel® FPGA IP version 19.1.
  • Added information for LPM_MULT Intel® FPGA IP version 19.1.0
  • Added information for Multiply Adder Intel® FPGA IP version 19.1.0
2019.04.02 19.1 Initial release.
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