Stratix® 10 Variable Precision DSP Blocks User Guide

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ID 683832
Date 7/08/2024
Public
Document Table of Contents
Document Table of Contents x
1. Stratix® 10 Variable Precision DSP Blocks Overview 2. Block Architecture Overview 3. Operational Mode Descriptions 4. Design Considerations 5. Stratix® 10 Variable Precision DSP Blocks Implementation Guide 6. Native Fixed Point DSP Stratix® 10 FPGA IP Core References 7. Multiply Adder IP Core References 8. ALTMULT_COMPLEX Intel® FPGA IP Core References 9. LPM_MULT Intel® FPGA IP Core References 10. Native Floating Point DSP Stratix® 10 FPGA IP References 11. LPM_DIVIDE (Divider) Intel FPGA IP Core 12. Stratix® 10 Variable Precision DSP Blocks User Guide Document Archives 13. Document Revision History for the Stratix® 10 Variable Precision DSP Blocks User Guide
1. Stratix® 10 Variable Precision DSP Blocks Overview x
1.1. Features 1.2. Supported Operational Modes in Stratix® 10 Devices 1.3. Resources
2. Block Architecture Overview x
2.1. Input Register Bank for Fixed-Point and Floating-Point Arithmetic 2.2. Pipeline Registers for Fixed-Point and Floating-Point Arithmetic 2.3. Pre-adder for Fixed-Point Arithmetic 2.4. Internal Coefficient for Fixed-Point Arithmetic 2.5. Multipliers for Fixed-Point and Floating-Point Arithmetic 2.6. Adder or Subtractor for Fixed-Point and Floating-Point Arithmetic 2.7. Accumulator, Chainout Adder, and Preload Constant for Fixed-Point Arithmetic 2.8. Systolic Register for Fixed-Point Arithmetic 2.9. Double Accumulation Register for Fixed-Point Arithmetic 2.10. Output Register Bank for Fixed-Point and Floating-Point Arithmetic 2.11. Exception Handling for Floating-Point Arithmetic
3. Operational Mode Descriptions 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. Multiplier Adder Sum Mode 3.1.3. Independent Complex Multiplier 3.1.4. 18 × 19 Multiplication Summed with 36-Bit Input Mode 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
3.1.5. 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. Single Floating-Point Arithmetic Functions 3.2.2. Multiple Floating-Point Arithmetic Functions
3.2.1. Single Floating-Point Arithmetic Functions x
3.2.1.1. Multiplication Mode 3.2.1.2. Adder or Subtract Mode 3.2.1.3. Multiply Accumulate Mode
3.2.2. Multiple Floating-Point Arithmetic Functions x
3.2.2.1. Multiply-Add or Multiply-Subtract Mode 3.2.2.2. Vector One Mode 3.2.2.3. Vector Two Mode 3.2.2.4. Direct Vector Dot Product 3.2.2.5. Complex Multiplication
4. Design Considerations x
4.1. Internal Coefficient and Pre-Adder for Fixed-Point Arithmetic 4.2. Accumulator for Fixed-Point Arithmetic 4.3. Chainout Adder 4.4. Input Cascade for Fixed-Point Arithmetic 4.5. DSP Block Cascade Limit in Agilex™ 7 Devices
5. Stratix® 10 Variable Precision DSP Blocks Implementation Guide x
5.1. 'X' Propagation Support in Simulation
6. Native Fixed Point DSP Stratix® 10 FPGA IP Core References x
6.1. Native Fixed Point DSP Stratix® 10 FPGA IP Release Information 6.2. Supported Operational Modes 6.3. Maximum Input Data Width for Fixed-Point Arithmetic 6.4. Parameterizing Native Fixed Point DSP IP Core 6.5. Signals
6.3. Maximum Input Data Width for Fixed-Point Arithmetic x
6.3.1. Using Less Than 36-Bit Operand In 18 x 18 Plus 36 Mode Example
6.4. Parameterizing Native Fixed Point DSP IP Core x
6.4.1. Native Fixed Point DSP Stratix® 10 FPGA IP Parameters
7. Multiply Adder IP Core References x
7.1. Multiply Adder Intel FPGA IP Release Information 7.2. Features 7.3. Parameters 7.4. Signals
7.2. Features x
7.2.1. Pre-adder 7.2.2. Systolic Delay Register 7.2.3. Pre-load Constant 7.2.4. Double Accumulator
7.2.1. Pre-adder x
7.2.1.1. Pre-adder Simple Mode 7.2.1.2. Pre-adder Coefficient Mode 7.2.1.3. Pre-adder Input Mode 7.2.1.4. Pre-adder Square Mode 7.2.1.5. Pre-adder Constant Mode
7.3. Parameters x
7.3.1. General Tab 7.3.2. Extra Modes 7.3.3. Multipliers Tab 7.3.4. Preadder Tab 7.3.5. Accumulator Tab 7.3.6. Systolic/Chainout Tab 7.3.7. Pipelining Tab
8. ALTMULT_COMPLEX Intel® FPGA IP Core References x
8.1. ALTMULT_COMPLEX Intel FPGA IP Release Information 8.2. Features 8.3. Complex Multiplication 8.4. Parameters 8.5. Signals
9. LPM_MULT Intel® FPGA IP Core References x
9.1. LPM_MULT Intel FPGA IP Release Information 9.2. Features 9.3. Parameters 9.4. Signals
9.3. Parameters x
9.3.1. General Tab 9.3.2. General 2 Tab 9.3.3. Pipelining Tab
10. Native Floating Point DSP Stratix® 10 FPGA IP References x
10.1. Native Floating Point DSP Stratix® 10 FPGA IP Release Information 10.2. Native Floating Point DSP Stratix® 10 FPGA IP Core Supported Operational Modes 10.3. Parameterizing the Native Floating Point DSP Stratix® 10 FPGA IP 10.4. Native Floating Point DSP Stratix® 10 FPGA IP Core Signals
10.3. Parameterizing the Native Floating Point DSP Stratix® 10 FPGA IP x
10.3.1. Native Floating Point DSP Stratix® 10 FPGA IP Parameters
11. LPM_DIVIDE (Divider) Intel FPGA IP Core x
11.1. LPM_DIVIDE Intel® FPGA IP Release Information 11.2. Features 11.3. Verilog HDL Prototype 11.4. VHDL Component Declaration 11.5. VHDL LIBRARY_USE Declaration 11.6. Ports 11.7. Parameters
11.7. Parameters x
11.7.1. General Tab 11.7.2. General1 Tab
1. Stratix® 10 Variable Precision DSP Blocks Overview
2. Block Architecture Overview
3. Operational Mode Descriptions
4. Design Considerations
5. Stratix® 10 Variable Precision DSP Blocks Implementation Guide
6. Native Fixed Point DSP Stratix® 10 FPGA IP Core References
7. Multiply Adder IP Core References
8. ALTMULT_COMPLEX Intel® FPGA IP Core References
9. LPM_MULT Intel® FPGA IP Core References
10. Native Floating Point DSP Stratix® 10 FPGA IP References
11. LPM_DIVIDE (Divider) Intel FPGA IP Core
12. Stratix® 10 Variable Precision DSP Blocks User Guide Document Archives
13. Document Revision History for the Stratix® 10 Variable Precision DSP Blocks User Guide

2.9. Double Accumulation Register for Fixed-Point Arithmetic

The accumulator supports double accumulation by enabling the 64-bit double accumulation registers located between the output register bank and the accumulator feedback path.

If the double accumulation register is enabled, an extra clock cycle delay is added into the feedback path of the accumulator.

This register has the same CLK, ENA, and CLR settings as the output register bank.

By enabling this register, you can have two accumulator channels using the same number of variable precision DSP block. This is useful when processing interleaved complex data (I, Q).

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