Variable Precision DSP Blocks User Guide: Agilex™ 5 FPGAs and SoCs

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ID 813968
Date 9/20/2024
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Document Table of Contents
Document Table of Contents x
1. Agilex™ 5 Variable Precision DSP Blocks Overview 2. Agilex™ 5 Variable Precision DSP Blocks Architecture 3. Agilex™ 5 Variable Precision DSP Blocks Operational Modes 4. Agilex™ 5 Variable Precision DSP Blocks Design Considerations 5. Native Fixed Point DSP 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 (Divider) Intel FPGA IP Core 10. Native Floating Point DSP Agilex™ FPGA IP References 11. Native AI Optimized DSP Agilex™ FPGA IP References 12. Document Revision History for the Agilex™ 5 Variable Precision DSP Blocks User Guide
1. Agilex™ 5 Variable Precision DSP Blocks Overview x
1.1. Features 1.2. Supported Operational Modes in Agilex™ 5 Devices
1.2. Supported Operational Modes in Agilex™ 5 Devices x
1.2.1. Fixed-point Arithmetic 1.2.2. Floating-point Arithmetic
2. Agilex™ 5 Variable Precision DSP Blocks Architecture x
2.1. Fixed-point Arithmetic 2.2. Floating-point Arithmetic 2.3. Tensor Mode
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
2.1.7. Accumulator, Chainout Adder, and Preload Constant for Fixed-point Arithmetic x
2.1.7.1. Dynamic Chainout
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™ 5 Variable Precision DSP Blocks Operational Modes x
3.1. Operational Modes for Fixed-point Arithmetic 3.2. Operational Modes for Floating-point Arithmetic 3.3. Operational Modes for Tensor Mode
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. 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
3.1.2. Multiplier Adder Sum Mode x
3.1.2.1. 8 x 8 (Unsigned) or 9 x 9 (Signed) Sum of 6 Mode
3.1.2.1. 8 x 8 (Unsigned) or 9 x 9 (Signed) Sum of 6 Mode x
3.1.2.1.1. 18 × 19 Multiplication Summed with 36-Bit Input Mode
3.1.4. Systolic FIR Mode x
3.1.4.1. Mapping Systolic Mode User View to Variable Precision Block Architecture View 3.1.4.2. 18-bit Systolic FIR Mode 3.1.4.3. 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
3.3. Operational Modes for Tensor Mode x
3.3.1. Data Input Feed Preloading Method 3.3.2. Side Input Feed Preloading Method 3.3.3. Tensor Floating-point Mode 3.3.4. Tensor Fixed-point Mode 3.3.5. Tensor Accumulation Mode
3.3.3. Tensor Floating-point Mode x
3.3.3.1. Input Register Bank for Tensor Floating-point Mode 3.3.3.2. Pipeline Registers for Tensor Floating-point Mode 3.3.3.3. Cascade Signals for Tensor Floating-point Mode 3.3.3.4. Output Registers for Tensor Floating-point Mode
3.3.4. Tensor Fixed-point Mode x
3.3.4.1. Input Register Bank for Tensor Fixed-point Mode 3.3.4.2. Pipeline Registers for Tensor Fixed-point Mode 3.3.4.3. Cascade Signals for Tensor Fixed-point Mode 3.3.4.4. Output Registers for Tensor Fixed-point Mode
3.3.5. Tensor Accumulation Mode x
3.3.5.1. Input Register Bank for Tensor Accumulation Mode 3.3.5.2. Pipeline Registers for Tensor Accumulation Mode 3.3.5.3. Cascade Signals for Tensor Accumulation Mode 3.3.5.4. Output Registers for Tensor Accumulation Mode
4. Agilex™ 5 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™ 5 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
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 Agilex™ FPGA IP Core References x
5.1. Native Fixed Point DSP 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 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 Agilex™ FPGA IP Signals x
5.6.1. 9 × 9 Sum of 6 Mode Signals 5.6.2. 16 × 16 Complex Multiplier Mode Signals 5.6.3. 18 × 18 Full Mode Signals 5.6.4. 18 × 18 Sum of Two Mode Signals 5.6.5. 18 × 18 Plus 36 Mode Signals 5.6.6. 18 × 18 Systolic Mode Signals 5.6.7. 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. Parameters 7.4. 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 (Divider) Intel FPGA IP Core 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 Agilex™ FPGA IP References x
10.1. Native Floating Point DSP Agilex™ FPGA IP Release Information 10.2. Native Floating Point DSP Agilex™ FPGA IP Core Supported Operational Modes 10.3. Parameterizing the Native Floating Point DSP Agilex™ FPGA IP 10.4. Native Floating Point DSP Agilex™ FPGA IP Core Signals 10.5. IP Migration
10.3. Parameterizing the Native Floating Point DSP Agilex™ FPGA IP x
10.3.1. General Tab 10.3.2. Registers Tab
10.4. Native Floating Point DSP 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
11. Native AI Optimized DSP Agilex™ FPGA IP References x
11.1. Native AI Optimized DSP Agilex™ FPGA IP Release Information 11.2. Native AI Optimized DSP Agilex™ FPGA IP Core Supported Operational Modes 11.3. Parameterizing the Native AI Optimized DSP Agilex™ FPGA IP 11.4. Native AI Optimized DSP Agilex™ FPGA IP Core Signals 11.5. IP Migration
11.3. Parameterizing the Native AI Optimized DSP Agilex™ FPGA IP x
11.3.1. Operation Mode Tab 11.3.2. Clock Source Enable/Clear Tab
11.4. Native AI Optimized DSP Agilex™ FPGA IP Core Signals x
11.4.1. Tensor Floating-point Mode Signals 11.4.2. Tensor Fixed-point Mode Signals 11.4.3. Tensor Accumulation Mode Signals
1. Agilex™ 5 Variable Precision DSP Blocks Overview
2. Agilex™ 5 Variable Precision DSP Blocks Architecture
3. Agilex™ 5 Variable Precision DSP Blocks Operational Modes
4. Agilex™ 5 Variable Precision DSP Blocks Design Considerations
5. Native Fixed Point DSP 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 (Divider) Intel FPGA IP Core
10. Native Floating Point DSP Agilex™ FPGA IP References
11. Native AI Optimized DSP Agilex™ FPGA IP References
12. Document Revision History for the Agilex™ 5 Variable Precision DSP Blocks User Guide

5.6.4. 18 × 18 Sum of Two Mode Signals

Figure 69. 18 × 18 Sum of Two Mode Signals


Table 69.  Data Input and Output Signals
Signal Name Type Width Description
ax[17:0] Input 18 Input data bus to top multiplier.

This signal is not available when internal coefficient feature is enabled.

ay[18:0] Input 19 Input data bus to top multiplier.

When pre-adder is enabled, these signals are served as input to the top pre-adder.

az[17:0] Input 18

These signal are input to the top pre-adder.

These signals are only available when pre-adder is enabled.

bx[17:0] Input 18 Input data bus to bottom multiplier.
by[18:0] Input 19 Input data bus to bottom multiplier.

When pre-adder is enabled, these signals serve as input signals to the bottom pre-adder.

bz[17:0] Input 18

These signals are input signals to the bottom pre-adder.

These signals are only available when pre-adder is enabled.

resulta[63:0] Output 37 Output data bus from top multiplier.
Table 70.  Clock, Enable, and Clear Signals
Signal Name Type Width Description
clk[0] Input 1 Input clock for all registers.
ena[2:0] Input 3 Clock enable signals for all registers.

Clock enable signals have higher priority compared to the SCLR signals.

These signals are active-High.
clr[1:0] Input 2 These signals can be asynchronous or synchronous clear input signals for all registers. You may select the type of clear input signal using Type of clear signal parameter.

These signals are active-High.

By default, this signal is low.

For more information about clock enable restrictions for input registers, refer to the related information.
Table 71.  Dynamic Control SignalsFor a summary of supported dynamic control features for each operational mode, refer to the related information.
Signal Name Type Width Description
disable_chainout Input 1 Dynamic input signal to enable dynamic chainout feature. You can change the value of this signal during run-time.

You must connect the chainout output bus to the next DSP block in order to use this signal.

  • 0: Send the chainout output to the next DSP block. Default value.
  • 1: Do not send the chainout output to the next DSP block. The chainout output is all zero.
disable_scanin Input 1 Dynamic input signal to enable dynamic scanin feature. You can change the value of this signal during run-time.

This signal is available when you Set Enable 'disable scanin parameter to Yes.

You must set Enable input cascade for 'ay' input parameter to Yes to use this signal.

  • 0: Switch the input of the top multiplier to use scanin input.
  • 1: Switch the input of the top multiplier to use ay input.
accumulate Input 1 Input signal to enable or disable the accumulator feature. You can change the value of this signal during run-time.
  • 0: Generate the current result without accumulating the previous result. Default value.
  • 1: Add the current result to the previous result.
loadconst Input 1 Input signal to enable or disable the load constant feature. You can change the value of this signal during run-time.
  • 0: Disable the load constant feature. Default value.
  • 1: Add a preload constant to the result to perform a biased rounding.
sub Input 1 Dynamic input signal to control the operation of the adder module. You can change the value of this signal during run-time.
  • 0: Add the output of the top multiplier with the output of the bottom multiplier. Default value.
  • 1: Subtract the output of the top multiplier from the output of the bottom multiplier.
negate Input 1 Dynamic input signal to control the operation of the chainout adder module. You can change the value of this signal during run-time.
  • 0: Add the sum of the top and bottom multipliers with the chainin data input bus and accumulate loopback data. Default value.
  • 1: Subtract the sum of the top and bottom multipliers from the chainin data input bus and accumulate loopback data.
Table 72.  Internal Coefficient PortsFor a summary of supported features for each operational mode, refer to the related information.
Signal Name Type Width Description
coefsela[2:0] Input 3 Input selection signals for 8 coefficient values defined by user for the top multiplier. The coefficient values are stored in the internal memory and specified by parameters coef_a_0 to coef_a_7.
  • coefsela[2:0] = 000 refers to coef_a_0
  • coefsela[2:0] = 001 refers to coef_a_1
  • coelsela[2:0] = 010 refers to coef_a_2 and so forth.

These signals are only available when the internal coefficient feature is enabled.

coefselb[2:0] Input 3 Input selection signals for 8 coefficient values defined by user for the bottom multiplier. The coefficient values are stored in the internal memory and specified by parameters coef_b_0 to coef_b_7.
  • coefselb[2:0] = 000 refers to coef_b_0
  • coefselb[2:0] = 001 refers to coef_b_1
  • coelselb[2:0] = 010 refers to coef_b_2 and so forth.

These signals are only available when the internal coefficient feature is enabled.

Table 73.  Input Cascade Signals
Signal Name Type Width Description
scanin[18:0] Input 19 Input data bus for input cascade module.

Connect these signals to the scanout signals from the preceding DSP core.

scanout[18:0] Output 19 Output data bus of the input cascade module.

Connect these signals to the scanin signals of the next DSP core.

Table 74.  Output Cascade Signals
Signal Name Type Width Description
chainin[63:0] Input 64 Input data bus for output cascade module.

Connect these signals to the chainout signals from the preceding DSP core.

chainout[63:0] Output 64 Output data bus of the output cascade module.

Connect these signals to the chainin signals of the next DSP core.

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