Intel® Quartus® Prime Pro Edition User Guide: Third-party Synthesis

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ID 683122
Date 12/12/2023
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Document Table of Contents
Document Table of Contents x
Answers to Top FAQs 1. Siemens EDA Precision* RTL Synthesis Support 2. Synopsys Synplify* Support A. Intel® Quartus® Prime Pro Edition User Guides
1. Siemens EDA Precision* RTL Synthesis Support x
1.1. About Precision RTL Synthesis Support 1.2. Precision RTL Integration Flow 1.3. Intel Device Family Support 1.4. Precision RTL Generated Files 1.5. Creating and Compiling a Project in the Precision Synthesis Software 1.6. Mapping the Design with Precision RTL 1.7. Synthesizing the Design and Evaluating the Results 1.8. Guidelines for Intel FPGA IP Cores and Architecture-Specific Features 1.9. Siemens EDA Precision* RTL Synthesis Support Revision History
1.2. Precision RTL Integration Flow x
1.2.1. Timing Optimization
1.6. Mapping the Design with Precision RTL x
1.6.1. Setting Timing Constraints 1.6.2. Setting Mapping Constraints 1.6.3. Assigning Pin Numbers and I/O Settings 1.6.4. Assigning I/O Registers 1.6.5. Disabling I/O Pad Insertion 1.6.6. Controlling Fan-Out on Data Nets
1.6.5. Disabling I/O Pad Insertion x
1.6.5.1. Preventing the Precision RTL Software from Adding I/O Pads 1.6.5.2. Preventing the Precision RTL Software from Adding an I/O Pad on an Individual Pin
1.7. Synthesizing the Design and Evaluating the Results x
1.7.1. Obtaining Accurate Logic Utilization and Timing Analysis Reports
1.8. Guidelines for Intel FPGA IP Cores and Architecture-Specific Features x
1.8.1. Instantiating IP Cores With IP Catalog-Generated Verilog HDL Files 1.8.2. Instantiating IP Cores With IP Catalog-Generated VHDL Files 1.8.3. Instantiating Intellectual Property With the IP Catalog and Parameter Editor 1.8.4. Instantiating Black Box IP Functions With Generated Verilog HDL Files 1.8.5. Instantiating Black Box IP Functions With Generated VHDL Files 1.8.6. Inferring Intel FPGA IP Cores from HDL Code
1.8.6. Inferring Intel FPGA IP Cores from HDL Code x
1.8.6.1. Multipliers 1.8.6.2. Setting the Use Dedicated Multiplier Option 1.8.6.3. Setting the dedicated_mult Attribute 1.8.6.4. Inferring Multiplier-Accumulators and Multiplier-Adders 1.8.6.5. Controlling DSP Block Inference 1.8.6.6. Inferring RAM and ROM
1.8.6.1. Multipliers x
1.8.6.1.1. Controlling DSP Block Inference for Multipliers
2. Synopsys Synplify* Support x
2.1. About Synplify Support 2.2. Synplify Software Integration Flow 2.3. Hardware Description Language Support 2.4. Intel Device Family Support 2.5. Tool Setup 2.6. Synplify Software Generated Files 2.7. Design Constraints Support 2.8. Simulation and Formal Verification 2.9. Synplify Optimization Strategies 2.10. Guidelines for Intel FPGA IP Cores and Architecture-Specific Features 2.11. Synopsys Synplify* Support Revision History 2.12. Intel Quartus Prime Pro Edition User Guide: Third-Party Synthesis Archives
2.5. Tool Setup x
2.5.1. Specifying the Intel® Quartus® Prime Software Version
2.7. Design Constraints Support x
2.7.1. Running the Intel® Quartus® Prime Software Manually With the Synplify-Generated Tcl Script 2.7.2. Passing Timing Analyzer SDC Timing Constraints to the Intel® Quartus® Prime Software
2.7.2. Passing Timing Analyzer SDC Timing Constraints to the Intel® Quartus® Prime Software x
2.7.2.1. Individual Clocks and Frequencies 2.7.2.2. Input and Output Delay 2.7.2.3. Multicycle Path 2.7.2.4. False Path
2.9. Synplify Optimization Strategies x
2.9.1. Using Synplify Premier to Optimize Your Design 2.9.2. Using Implementations in Synplify Pro or Premier 2.9.3. Timing-Driven Synthesis Settings 2.9.4. FSM Compiler 2.9.5. Optimization Attributes and Options 2.9.6. Intel-Specific Attributes
2.9.3. Timing-Driven Synthesis Settings x
2.9.3.1. Clock Frequencies 2.9.3.2. Multiple Clock Domains 2.9.3.3. Input and Output Delays 2.9.3.4. Multicycle Paths 2.9.3.5. False Paths
2.9.4. FSM Compiler x
2.9.4.1. FSM Explorer in Synplify Pro and Premier
2.9.5. Optimization Attributes and Options x
2.9.5.1. Retiming in Synplify Pro and Premier 2.9.5.2. Maximum Fan-Out 2.9.5.3. Preserving Nets 2.9.5.4. Register Packing 2.9.5.5. Resource Sharing 2.9.5.6. Preserving Hierarchy 2.9.5.7. Register Input and Output Delays 2.9.5.8. syn_direct_enable 2.9.5.9. I/O Standard
2.9.6. Intel-Specific Attributes x
2.9.6.1. altera_chip_pin_lc 2.9.6.2. altera_io_powerup 2.9.6.3. altera_io_opendrain
2.10. Guidelines for Intel FPGA IP Cores and Architecture-Specific Features x
2.10.1. Instantiating Intel FPGA IP Cores with the IP Catalog 2.10.2. Including Files for Intel® Quartus® Prime Placement and Routing Only 2.10.3. Inferring Intel FPGA IP Cores from HDL Code
2.10.1. Instantiating Intel FPGA IP Cores with the IP Catalog x
2.10.1.1. Instantiating Intel FPGA IP Cores with IP Catalog Generated Verilog HDL Files 2.10.1.2. Instantiating Intel FPGA IP Cores with IP Catalog Generated VHDL Files 2.10.1.3. Changing Synplify’s Default Behavior for Instantiated Intel FPGA IP Cores 2.10.1.4. Instantiating Intellectual Property with the IP Catalog and Parameter Editor 2.10.1.5. Instantiating Black Box IP Cores with Generated Verilog HDL Files 2.10.1.6. Instantiating Black Box IP Cores with Generated VHDL Files 2.10.1.7. Other Synplify Software Attributes for Creating Black Boxes
2.10.3. Inferring Intel FPGA IP Cores from HDL Code x
2.10.3.1. Inferring Multipliers 2.10.3.2. Inferring RAM 2.10.3.3. RAM Initialization 2.10.3.4. Inferring ROM 2.10.3.5. Inferring Shift Registers
2.10.3.1. Inferring Multipliers x
2.10.3.1.1. Resource Balancing 2.10.3.1.2. Controlling the DSP Block Inference 2.10.3.1.3. Signal Level Attribute
Answers to Top FAQs
1. Siemens EDA Precision* RTL Synthesis Support
2. Synopsys Synplify* Support
A. Intel® Quartus® Prime Pro Edition User Guides

1.6.6. Controlling Fan-Out on Data Nets

Fan-out is defined as the number of nodes driven by an instance or top‑level port. High fan-out nets can cause significant delays that result in an unroutable net. On a critical path, high fan-out nets can cause longer delays in a single net segment that result in the timing constraints not being met. To prevent this behavior, each device family has a global fan‑out value set in the Precision RTL software library. In addition, the Intel® Quartus® Prime software automatically routes high fan-out signals on global routing lines in the Intel device whenever possible.

To eliminate routability and timing issues associated with high fan-out nets, the Precision RTL software also allows you to override the library default value on a global or individual net basis. You can override the library value by setting a max_fanout attribute on the net.

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