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

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ID 683122
Date 3/28/2022
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Document Table of Contents
Document Table of Contents x
1. Mentor Graphics Precision* Synthesis Support 2. Synopsys Synplify* Support A. Intel® Quartus® Prime Pro Edition User Guides
1. Mentor Graphics Precision* Synthesis Support x
1.1. About Precision RTL Synthesis Support 1.2. Design Flow 1.3. Intel Device Family Support 1.4. Precision Synthesis Generated Files 1.5. Creating and Compiling a Project in the Precision Synthesis Software 1.6. Mapping the Precision Synthesis Design 1.7. Synthesizing the Design and Evaluating the Results 1.8. Guidelines for Intel FPGA IP Cores and Architecture-Specific Features 1.9. Mentor Graphics Precision* Synthesis Support Revision History
1.2. Design Flow x
1.2.1. Timing Optimization
1.6. Mapping the Precision Synthesis Design 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 Synthesis Software from Adding I/O Pads 1.6.5.2. Preventing the Precision Synthesis 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. Multiplier-Accumulators and Multiplier-Adders 1.8.6.5. Controlling DSP Block Inference Setting the extract_mac Attribute in Verilog HDL Setting the extract_mac Attribute in VHDL Using extract_mac, dedicated_mult, and preserve_signal in Verilog HDL Using extract_mac, dedicated_mult, and preserve_signal in VHDL 1.8.6.6. 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. Design 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
1. Mentor Graphics Precision* Synthesis Support
2. Synopsys Synplify* Support
A. Intel® Quartus® Prime Pro Edition User Guides

1.8.6.5. Controlling DSP Block Inference

By default, the Precision Synthesis software infers the ALTMULT_ADD or ALTMULT_ACCUM IP cores appropriately in your design. These IP cores allow the Intel® Quartus® Prime software to select either logic or DSP blocks, depending on the device utilization and the size of the function.

You can use the extract_mac attribute to prevent inference of an ALTMULT_ADD or ALTMULT_ACCUM IP cores in a certain module or entity.

Table 4.  Options for extract_mac Attribute Controlling DSP Implementation
Value Description
TRUE The ALTMULT_ADD or ALTMULT_ACCUM IP core is inferred.
FALSE The ALTMULT_ADD or ALTMULT_ACCUM IP core is not inferred.

To control inference, use the extract_mac attribute with the appropriate value from the examples below in your HDL code.

Setting the extract_mac Attribute in Verilog HDL

//synthesis attribute <module name> extract_mac <value>

Setting the extract_mac Attribute in VHDL

ATTRIBUTE extract_mac: BOOLEAN;
ATTRIBUTE extract_mac OF <entity name>: ENTITY IS <value>;

Using extract_mac, dedicated_mult, and preserve_signal in Verilog HDL

To control the implementation of the multiplier portion of a multiply-accumulator or multiply-adder, you must use the dedicated_mult attribute.

You can use the extract_mac, dedicated_mult, and preserve_signal attributes (in Verilog HDL and VHDL) to implement the given DSP function in logic in the Intel® Quartus® Prime software. 

module unsig_altmult_accuml (dataout, dataa, datab, clk, aclr, clken);
   input [7:0} dataa, datab;
   input clk, aclr, clken;
   output [31:0] dataout;

   reg    [31:0] dataout;
   wire   [15:0] multa;
   wire   [31:0] adder_out;

   assign multa = dataa * datab;

   //synthesis attribute multa preserve_signal TRUE
   //synthesis attribute multa dedicated_mult OFF
   assign adder_out = multa + dataout;

   always @ (posedge clk or posedge aclr)
   begin
      if (aclr)
      dataout <= 0;
      else if (clken)
      dataout <= adder_out;
   end

   //synthesis attribute unsig_altmult_accuml extract_mac FALSE
endmodule

Using extract_mac, dedicated_mult, and preserve_signal in VHDL 

LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
USE ieee.std_logic_signed.all;
ENTITY signedmult_add IS
   PORT(
      a, b, c, d: IN STD_LOGIC_VECTOR (7 DOWNTO 0);
      result: OUT STD_LOGIC_VECTOR (15 DOWNTO 0));
   ATTRIBUTE preserve_signal: BOOLEANS;
   ATTRIBUTE dedicated_mult: STRING;
   ATTRIBUTE extract_mac: BOOLEAN;
   ATTRIBUTE extract_mac OF signedmult_add: ENTITY IS FALSE;
END signedmult_add;
ARCHITECTURE rtl OF signedmult_add IS
   SIGNAL a_int, b_int, c_int, d_int : signed (7 DOWNTO 0);
   SIGNAL pdt_int, pdt2_int : signed (15 DOWNTO 0);
   SIGNAL result_int: signed (15 DOWNTO 0);
   ATTRIBUTE preserve_signal OF pdt_int: SIGNAL IS TRUE;
   ATTRIBUTE dedicated_mult OF pdt_int: SIGNAL IS "OFF";
   ATTRIBUTE preserve_signal OF pdt2_int: SIGNAL IS TRUE;
   ATTRIBUTE dedicated_mult OF pdt2_int: SIGNAL IS "OFF";
BEGIN
   a_int <= signed (a);
   b_int <= signed (b);
   c_int <= signed (c);
   d_int <= signed (d);
   pdt_int <= a_int * b_int;
   pdt2_int <= c_int * d_int;
   result_int <= pdt_int + pdt2_int;
   result <= STD_LOGIC_VECTOR(result_int);
END rtl;
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