Floating-Point IP Cores User Guide

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ID 683750
Date 10/27/2021
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Document Table of Contents
Document Table of Contents x
1. About Floating-Point IP Cores 2. FP_ACC_CUSTOM Intel® FPGA IP or Floating Point Custom Accumulator Intel® FPGA IP Core 3. ALTFP_ADD_SUB IP Core 4. ALTFP_DIV IP Core 5. ALTFP_MULT IP Core 6. ALTFP_SQRT 7. ALTFP_EXP IP Core 8. ALTFP_INV IP Core 9. ALTFP_INV_SQRT IP Core 10. ALTFP_LOG 11. ALTFP_ATAN IP Core 12. ALTFP_SINCOS IP Core 13. ALTFP_ABS IP Core 14. ALTFP_COMPARE IP Core 15. ALTFP_CONVERT IP Core 16. FP_FUNCTIONS Intel® FPGA IP or Floating Point Functions Intel® FPGA IP Core 17. Floating-Point IP Cores User Guide Document Archives 18. Document Revision History for the Floating-Point IP Cores User Guide
1. About Floating-Point IP Cores x
1.1. List of Floating-Point IP Cores 1.2. Installing and Licensing Intel® FPGA IP Cores 1.3. Design Flow 1.4. Upgrading IP Cores 1.5. Floating-Point IP Cores General Features 1.6. IEEE-754 Standard for Floating-Point Arithmetic 1.7. Non-IEEE-754 Standard Format 1.8. Floating-Points IP Cores Output Latency 1.9. Floating-Point IP Cores Design Example Files 1.10. VHDL Component Declaration 1.11. VHDL LIBRARY-USE Declaration
1.3. Design Flow x
1.3.1. IP Catalog and Parameter Editor 1.3.2. Specifying the IP Core Parameters and Options ( Intel® Quartus® Prime Pro Edition) 1.3.3. Generating IP Cores ( Intel® Quartus® Prime Standard Edition)
1.3.1. IP Catalog and Parameter Editor x
1.3.1.1. The Parameter Editor
1.3.2. Specifying the IP Core Parameters and Options ( Intel® Quartus® Prime Pro Edition) x
1.3.2.1. IP Core Generation Output ( Intel® Quartus® Prime Pro Edition)
1.4. Upgrading IP Cores x
1.4.1. Migrating IP Cores to a Different Device
1.6. IEEE-754 Standard for Floating-Point Arithmetic x
1.6.1. Floating-Point Formats 1.6.2. Special Case Numbers 1.6.3. Rounding
1.6.1. Floating-Point Formats x
1.6.1.1. Single-Precision Format 1.6.1.2. Double-Precision Format 1.6.1.3. Single-Extended Precision Format
2. FP_ACC_CUSTOM Intel® FPGA IP or Floating Point Custom Accumulator Intel® FPGA IP Core x
2.1. FP_ACC_CUSTOM Intel® FPGA IP or Floating Point Custom Accumulator Intel® FPGA IP Features 2.2. FP_ACC_CUSTOM Intel® FPGA IP or Floating Point Custom Accumulator Intel® FPGA IP Output Latency 2.3. FP_ACC_CUSTOM Intel® FPGA IP Resource Utilization and Performance 2.4. FP_ACC_CUSTOM Intel® FPGA IP or Floating Point Custom Accumulator Intel® FPGA IP Signals 2.5. FP_ACC_CUSTOM Intel® FPGA IP or Floating Point Custom Accumulator Intel® FPGA IP Parameters
3. ALTFP_ADD_SUB IP Core x
3.1. ALTFP_ADD_SUB Features 3.2. ALTFP_ADD_SUB Output Latency 3.3. ALTFP_ADD_SUB Truth Table 3.4. ALTFP_ADD_SUB Resource Utilization and Performance 3.5. ALTFP_ADD_SUB Design Example: Addition of Double-Precision Format Numbers 3.6. ALTFP_ADD_SUB Signals 3.7. ALTFP_ADD_SUB Parameters
3.5. ALTFP_ADD_SUB Design Example: Addition of Double-Precision Format Numbers x
3.5.1. ALTFP_ADD_SUM Design Example: Understanding the Simulation Results
4. ALTFP_DIV IP Core x
4.1. ALTFP_DIV Features 4.2. ALTFP_DIV Output Latency 4.3. ALTFP_DIV Truth Table 4.4. ALTFP_DIV Resource Utilization and Performance 4.5. ALTFP_DIV Design Example: Division of Single-Precision 4.6. ALTFP_DIV Signals 4.7. ALTFP_DIV Parameters
4.5. ALTFP_DIV Design Example: Division of Single-Precision x
4.5.1. ALTFP_DIV Design Example: Understanding the Simulation Results
5. ALTFP_MULT IP Core x
5.1. ALTFP_MULT IP Core Features 5.2. ALTFP_MULT Output Latency 5.3. ALTFP_MULT Truth Table 5.4. ALTFP_MULT Resource Utilization and Performance 5.5. ALTFP_MULT Design Example: Multiplication of Double-Precision Format Numbers 5.6. Parameters 5.7. ALTFP_MULT Signals
5.5. ALTFP_MULT Design Example: Multiplication of Double-Precision Format Numbers x
5.5.1. ALTFP_MULT Design Example: Understanding the Simulation Waveform
6. ALTFP_SQRT x
6.1. ALTFP_SQRT Features 6.2. Output Latency 6.3. ALTFP_SQRT Truth Table 6.4. ALTFP_SQRT Resource Utilization and Performance 6.5. ALTFP_SQRT Design Example: Square Root of Single-Precision Format Numbers 6.6. ALTFP_SQRT Signals 6.7. ALTFP_SQRT Parameters
6.5. ALTFP_SQRT Design Example: Square Root of Single-Precision Format Numbers x
6.5.1. ALTFP_SQRT Design Example: Understanding the Simulation Results
7. ALTFP_EXP IP Core x
7.1. ALTFP_EXP Features 7.2. Output Latency 7.3. ALTFP_EXP Truth Table 7.4. ALTFP_EXP Resource Utilization and Performance 7.5. ALTFP_EXP Design Example: Exponential of Single-Precision Format Numbers 7.6. ALTFP_EXP Signals 7.7. ALTFP_EXP Parameters
7.5. ALTFP_EXP Design Example: Exponential of Single-Precision Format Numbers x
7.5.1. ALTFP_EXP Design Example: Understanding the Simulation Results
8. ALTFP_INV IP Core x
8.1. ALTFP_INV Features 8.2. Output Latency 8.3. ALTFP_INV Truth Table 8.4. ALTFP_INV Resource Utilization and Performance 8.5. ALTFP_INV Design Example: Inverse of Single-Precision Format Numbers 8.6. Ports 8.7. Parameters
8.5. ALTFP_INV Design Example: Inverse of Single-Precision Format Numbers x
8.5.1. ALTFP_INV Design Example: Understanding the Simulation Results
9. ALTFP_INV_SQRT IP Core x
9.1. ALTFP_INV_SQRT Features 9.2. Output Latency 9.3. ALTFP_INV_SQRT Truth Table 9.4. ALTFP_INV_SQRT Resource Utilization and Performance 9.5. ALTFP_INV_SQRT Design Example: Inverse Square Root of Single-Precision Format Numbers 9.6. Ports 9.7. Parameters
9.5. ALTFP_INV_SQRT Design Example: Inverse Square Root of Single-Precision Format Numbers x
9.5.1. ALTFP_INV_SQRT Design Example: Understanding the Simulation Results
10. ALTFP_LOG x
10.1. ALTFP_LOG Features 10.2. Output Latency 10.3. ALTFP_LOG Truth Table 10.4. ALTFP_LOG Resource Utilization and Performance 10.5. ALTFP_LOG Design Example: Natural Logarithm of Single-Precision Format Numbers 10.6. Signals 10.7. Parameters
10.5. ALTFP_LOG Design Example: Natural Logarithm of Single-Precision Format Numbers x
10.5.1. ALTFP_LOG Design Example: Understanding the Simulation Results
11. ALTFP_ATAN IP Core x
11.1. Output Latency 11.2. ALTFP_ATAN Features 11.3. ALTFP_ATAN Resource Utilization and Performance 11.4. Ports 11.5. ALTFP_ATAN Parameters
12. ALTFP_SINCOS IP Core x
12.1. ALTFP_SINCOS Features 12.2. Output Latency 12.3. ALTFP_SINCOS Resource Utilization and Performance 12.4. ALTFP_SINCOS Signals 12.5. ALTFP_SINCOS Parameters
13. ALTFP_ABS IP Core x
13.1. ALTFP_ABS Features 13.2. ALTFP_ABS Output Latency 13.3. ALTFP_ABS Resource Utilization and Performance 13.4. ALTFP_ABS Design Example: Absolute Value of Multiplication Results 13.5. ALTFP_ABS Signals 13.6. ALTFP_ABS Parameters
13.4. ALTFP_ABS Design Example: Absolute Value of Multiplication Results x
13.4.1. ALTFP_ABS Design Example: Understanding the Simulation Results
14. ALTFP_COMPARE IP Core x
14.1. ALTFP_COMPARE Features 14.2. ALTFP_COMPARE Output Latency 14.3. ALTFP_COMPARE Resource Utilization and Performance 14.4. ALTFP_COMPARE Design Example: Comparison of Single-Precision Format Numbers 14.5. ALTFP_COMPARE Signals 14.6. ALTFP_COMPARE Parameters
14.4. ALTFP_COMPARE Design Example: Comparison of Single-Precision Format Numbers x
14.4.1. ALTFP_COMPARE Design Example: Understanding the Simulation Results
15. ALTFP_CONVERT IP Core x
15.1. ALTFP_CONVERT Features 15.2. ALTFP_CONVERT Conversion Operations 15.3. ALTFP_CONVERT Output Latency 15.4. ALTFP_CONVERT Resource Utilization and Performance 15.5. ALTFP_CONVERT Design Example: Convert Double-Precision Floating-Point Format Numbers 15.6. ALTFP_CONVERT Signals 15.7. ALTFP_CONVERT Parameters
15.5. ALTFP_CONVERT Design Example: Convert Double-Precision Floating-Point Format Numbers x
15.5.1. ALTFP_CONVERT Design Example: Understanding the Simulation Results
16. FP_FUNCTIONS Intel® FPGA IP or Floating Point Functions Intel® FPGA IP Core x
16.1. FP_FUNCTIONS Intel® FPGA IP or Floating Point Functions Intel® FPGA IP Features 16.2. FP_FUNCTIONS Intel® FPGA IP or Floating Point Functions Intel® FPGA IP Output Latency 16.3. FP_FUNCTIONS Intel® FPGA IP or Floating Point Functions Intel® FPGA IP Target Frequency 16.4. FP_FUNCTIONS Intel® FPGA IP or Floating Point Functions Intel® FPGA IP Combined Target 16.5. FP_FUNCTIONS Intel® FPGA IP Resource Utilization and Performance 16.6. FP_FUNCTIONS Intel® FPGA IP Signals 16.7. FP_FUNCTIONS Intel® FPGA IP Parameters
1. About Floating-Point IP Cores
2. FP_ACC_CUSTOM Intel® FPGA IP or Floating Point Custom Accumulator Intel® FPGA IP Core
3. ALTFP_ADD_SUB IP Core
4. ALTFP_DIV IP Core
5. ALTFP_MULT IP Core
6. ALTFP_SQRT
7. ALTFP_EXP IP Core
8. ALTFP_INV IP Core
9. ALTFP_INV_SQRT IP Core
10. ALTFP_LOG
11. ALTFP_ATAN IP Core
12. ALTFP_SINCOS IP Core
13. ALTFP_ABS IP Core
14. ALTFP_COMPARE IP Core
15. ALTFP_CONVERT IP Core
16. FP_FUNCTIONS Intel® FPGA IP or Floating Point Functions Intel® FPGA IP Core
17. Floating-Point IP Cores User Guide Document Archives
18. Document Revision History for the Floating-Point IP Cores User Guide

1.4. Upgrading IP Cores

Any Intel® FPGA IP variations that you generate from a previous version or different edition of the Intel® Quartus® Prime software, may require upgrade before compilation in the current software edition or version. The Project Navigator displays a banner indicating the IP upgrade status. Click Launch IP Upgrade Tool or Project > Upgrade IP Components to upgrade outdated IP cores.
Figure 6. IP Upgrade Alert in Project Navigator


Icons in the Upgrade IP Components dialog box indicate when IP upgrade is required, optional, or unsupported for an IP variation in the project. Upgrade IP variations that require upgrade before compilation in the current version of the Intel® Quartus® Prime software.

Note: Upgrading IP cores may append a unique identifier to the original IP core entity names, without similarly modifying the IP instance name. There is no requirement to update these entity references in any supporting Intel® Quartus® Prime file, such as the Intel® Quartus® Prime Settings File (.qsf), Synopsys* Design Constraints File (.sdc), or Signal Tap File (.stp), if these files contain instance names. The Intel® Quartus® Prime software reads only the instance name and ignores the entity name in paths that specify both names. Use only instance names in assignments.
Table 5.  IP Core Upgrade Status
IP Core Status Description
IP Upgraded

Indicates that your IP variation uses the latest version of the Intel® FPGA IP core.
IP Component Outdated

Indicates that your IP variation uses an outdated version of the IP core.
IP Upgrade Optional

Indicates that upgrade is optional for this IP variation in the current version of the Intel® Quartus® Prime software. You can upgrade this IP variation to take advantage of the latest development of this IP core. Alternatively, you can retain previous IP core characteristics by declining to upgrade. Refer to the Description for details about IP core version differences. If you do not upgrade the IP, the IP variation synthesis and simulation files are unchanged and you cannot modify parameters until upgrading.
IP Upgrade Required

Indicates that you must upgrade the IP variation before compiling in the current version of the Intel® Quartus® Prime software. Refer to the Description for details about IP core version differences.
IP Upgrade Unsupported

Indicates that upgrade of the IP variation is not supported in the current version of the Intel® Quartus® Prime software due to incompatibility with the current version of the Intel® Quartus® Prime software. The Intel® Quartus® Prime software prompts you to replace the unsupported IP core with a supported equivalent IP core from the IP Catalog. Refer to the Description for details about IP core version differences and links to Release Notes.
IP End of Life

Indicates that Intel designates the IP core as end-of-life status. You may or may not be able to edit the IP core in the parameter editor. Support for this IP core discontinues in future releases of the Intel® Quartus® Prime software.
IP Upgrade Mismatch Warning

Provides warning of non-critical IP core differences in migrating IP to another device family.
IP has incompatible subcores

 Indicates that the current version of the Intel® Quartus® Prime software does not support compilation of your IP variation, because the IP has incompatible subcores.
Compilation of IP Not Supported

Indicates that the current version of the Intel® Quartus® Prime software does not support compilation of your IP variation. This can occur if another edition of the Intel® Quartus® Prime software, such as the Intel® Quartus® Prime Standard Edition, generated this IP. Replace this IP component with a compatible component in the current edition.
Note: Beginning with the Intel® Quartus® Prime Pro Edition software version 19.1, IP upgrade supports migration of IP released within one year of the Intel® Quartus® Prime Pro Edition software version, as the following chart defines:
Figure 7.  Intel® Quartus® Prime Pro Edition IP Version Upgrade Paths

Follow these steps to upgrade IP cores:

  1. In the latest version of the Intel® Quartus® Prime software, open the Intel® Quartus® Prime project containing an outdated IP core variation. The Upgrade IP Components dialog box automatically displays the status of IP cores in your project, along with instructions for upgrading each core. To access this dialog box manually, click Project > Upgrade IP Components.
  2. To upgrade one or more IP cores that support automatic upgrade, ensure that you turn on the Auto Upgrade option for the IP cores, and click Auto Upgrade. The Status and Version columns update when upgrade is complete. Example designs that any Intel® FPGA IP core provides regenerate automatically whenever you upgrade an IP core.
  3. To manually upgrade an individual IP core, select the IP core and click Upgrade in Editor (or simply double-click the IP core name). The parameter editor opens, allowing you to adjust parameters and regenerate the latest version of the IP core.
    Figure 8. Upgrading IP Cores ( Intel® Quartus® Prime Pro Edition Example)


    Note: Intel® FPGA IP cores older than Intel® Quartus® Prime software version 12.0 do not support upgrade. Intel verifies that the current version of the Intel® Quartus® Prime software compiles the previous two versions of each IP core. The Intel® FPGA IP Core Release Notes reports any verification exceptions for Intel® FPGA IP cores. Intel does not verify compilation for IP cores older than the previous two releases.

Section Content
Migrating IP Cores to a Different Device

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