Frequently asked questions synplify synthesis microsemi. Purpose the purpose of this laboratory is to provide you with. Typically, you use this netlist for gatelevel simulation, to verify your synthesis results. I have a vhdl only vivado project and only have a vhdl simulator license for. If you do not intend to run post synthesis simulation, you can turn off the generation of the post synthesis hdl netlist by rightclicking the configure design flow button on the libero design flow window. The new compile point technology enables additional speed improvements with automatic parallel timingdriven synthesis execution on different portions of a design to take advantage of computers. The solution offers simulator like visibility into the implemented fpga hardware and. But i have diffculty trying to understand how to initialize the design since all my initial blocks used are non synthesizable are connected to some constants. Synthesis and simulation design guide overview the synthesis and simulation design guide provides a general overview of designing field programmable gate array fpga devices using a hardware description language hdl. Performing a gatelevel simulation with the rivierapro software. If you use any other version of the software, results may not exactly match the results in the tutorial, although you can still follow the general methodology described in this document. Synopsys synplify pro me is a synthesis tool integrated into libero soc and libero ide, enabling you to target and fully optimize your hdl design for any microsemi device. While designing piso parallel in serial out in xilinx vivado using verilog, the output waveform of the behavioral simulation rtllevel, presynthesis shows correct desired output value but postsynthesis or postimplementation functional or timing.
Postsynthesis simulation uses the hardware model for the given temperature, core voltage, speed grade etc. In the asic design flow, designers perform functional simulation prior to synthesis. Remove the default input file, and select your testbench as an input file by clicking at the button close to the cross sign marked by a dot. Normally the functionality equivalency will be covered by a lec tool. Synopsys enhances synplify fpga synthesis software with up. Post synthesis simulation and onespin formal equivalency check results showed an incorrect value on a sum register. Critical path resynthesis increases the performance of the device. Synopsys enhances synplify fpga synthesis software with up to. Simulating a design with xilinx libraries unisim, unimacro, xilinxcorelib, simprims, secureip this application note provides a quick overview of xilinxtargeted simulation flow based on aldecs design and verification environments, activehdl or rivierapro. The quartus prime pro edition development software provides a complete design environment for systemonaprogrammablechip sopc design.
It will also be immediately obvious from the post synthesis simulation results and will appear as a nonfunctional state machine the fsm will not advance between states or fsm signals will be missing. Click at the options button next to the post synthesis simulation icon. When i simulate using msim i see the outputs as unknown value from only the modules having coregenerator instances. Getting wrong results in post synthesis simulation. Hello, in verilog code, i am doing the pre synthesis simulation correctly for the attached attachment text. This can be done in rtl using after clause for example or in behavioral using wait statements. The synplify premier toolset automates many functions for fpga synthesis so designers. Inference is followed by optimization to reduce the size or increase the speed of of the. The netlist contains more of the information regarding the silicon resources i. Performing a postsynthesis simulation with the rivierapro software. There is a note in ug900, logic simulation user guide outlining this.
Postsynthesis simulation, quartus and modelsimaltera. With larger designs, more thirdparty ip, globallydistributed design teams, and increasing performance and power. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. There is a new vhdl file created from your netlist, comprising all rtl technology elements. The dft insertion will be checked by the fact you are able to generate the patterns and able to simulate them. Precision 2006a can be downloaded from actels website.
I have written a verilog code and rtl simulation is working fine. Presynthesis and postsynthesis simulation not matched. Synplify pro fpga synthesis software is the industry standard for producing highperformance and costeffective fpga designs. The synplify synthesis tools provide fast runtime, performance, area optimization for cost and power reduction, multifpga vendor support, incremental and teamdesign capabilities for faster fpga design development. Synthesis user guide ug018 this user guide describes how to use synplify pro from synopsys to synthesize a design and generate a netlist for implementation in achronix devices. Rtl modeling with systemverilog for simulation and synthesis. Take designs created from lab 1, lab 2, lab 3, and lab 4 and load them onto the kc705 board. Performing a post synthesis simulation with the rivierapro software. Simulation is the process of verifying the functionality and timing of a design against its original specifications. Lattice diamond software includes changes to projects that support multifile simulation testbenches and allow different models for simulation or synthesis for a single module. Integrated module generation and mapping scope multilevel design constraints languagesensitive editor. Please search for this file and post its entity definition, so we.
Download examples associated with this tutorial posted at. Synplify pro ae is needed for synthesis and modelsim pese full feature version from mentor is needed to run simulation on a mixed hdl design. Vhdlpld design flow synthesis and post synthesis simulation this laboratory is to be performed the week starting feb. Fsms generated by hand or by software other than version 8. Just as simulation process is based on discrete event simulation, synthesis process from vhdl model is based on the process of inference. Mismatch between rtllevel simulation and postsynthesis. Use a init value other than 0 on c1 to see if you can find it in the synthesys result. Post synthesis simulation uses the hardware model for the given temperature, core voltage, speed grade etc.
Post synthesis and post implementation timing simulations are supported for verilog only. The following links also provide good information using ncverilog tools for post synthesis simulation. The quartus version list is available only after selecting an altera device. Rtl modeling with systemverilog for simulation and. The read write check on ram option on the device panel lets the synthesis tool insert bypass logic around the ram to prevent a simulation mismatch between the rtl and postsynthesis simulations. Synopsys synplify pro me free version download for pc. Synplicity fpga synthesis synplify, synplify pro, synplify premier, and synplify premier with design planner user guide december 2005 synplicity, inc. For the post synthesis simulation we need to use the vhdl. The synplify premier softwares graphbased physical synthesis technology addresses timing closure by generating timing estimates that are tightly matched to postplaceandroute results. Rtl modeling with systemverilog for simulation and synthesis using systemverilog for asic and fpga design stuart sutherland download bok. Postsynthesis simulation runs the netlist version of the design.
Xilinx synthesis and simulation design guide mafiadoc. The following links also provide good information using ncverilog tools for postsynthesis simulation. Click at the options button next to the postsynthesis simulation icon. Regardless of whether you use a personal computer or a linux workstation, the quartus prime pro edition software ensures easy design entry, fast processing, and straightforward device programming.
The other option is to generate the simulation scripts only by selecting the generate scripts only option in the simulation settings. Synplify premier is the industrys most advanced fpga design and debug environment. The simulation wizard has been enhanced to parse for the simulation top and to pass this information and other options directly to a simulator. Fpga design tools from achronix achronix semiconductor corp. Activehdl for postsynthesis simulation and by xilinx ise for. Hi, i was trying my hand at running a post synthesis simulation of one of my designs. Synopsys synplicity business group announces new products. The synplify pro and synplify premier fpga design tools provide additional value by offering links to highperformance functional verification with vcs simulation and integration with synphony model compiler for highlevel synthesis of signal processing hardware. Hi friends i am trying to run my post synthesis simulation using modelsim, xilinx has generated the.
Synthesis compilers must infer typical hardware components and their interconnection from the vhdl code. Ace works in conjunction with thirdparty synthesis and simulation tools to provide a complete design environment for achronix fpgas. Post synthesis simulation of all state machines in the design will detect the fault, if it is present. Timing simualtion is a simulation using timing information. Maybe the hdlanalysist from synplify pro can give you a hint technology view. Is synplify pro synthesis tool supported in all the libero licenses. Performing a functional simulation with the rivierapro software. My design flow requires both post synthesis and post implementation timing simulations to be run as part of our verification process.
Once done, choose the appropriate toplevel unit, which is. Performing a timing simulation with the questasim software. Critical path re synthesis increases the performance of the device. Avoid using constants etc defined in the package file in your testbenches when simulating post synthesis or post implementation design. Performing a functional simulation with the vcs mx software. Postsynthesis simulation and onespin formal equivalency check results showed an incorrect value on a sum register. When a rom block is inferred from an hdl design, the synplify software. The outfit was initially established as optimal solutions with a charter to develop and market synthesis technology developed by the team at general electric. Learn more getting wrong results in post synthesis simulation. Post synthesis and post implementation timing simulations are not supported for vhdl in vivado. Introduction to fpga synthesis tools linkedin slideshare. After synthesis, gate level simulation is performed on the netlist generated by synthesis. The code is as below it is simulating properly but the post synthesis results are not right can anyone.
Enhance post implementation debugging by using the eco flow to replace debug probes. This is a great debugging aid, especially when writing timing constraints. Synplify lite is now eliminated, offering the same synplify ae synthesis features to all libero users. After this i synthesized the design using xst tool in xilinx ise. Synplify synthesis techniques with the quartus ii software online training.
The fault condition, if present, will appear in the netlist produced by synplify. The software also supports fpga architectures from a variety of fpga vendors, including altera, achronix. Why has my logic block disappeared after synthesis. It will also be immediately obvious from the postsynthesis simulation results and will appear as a nonfunctional state machine the fsm will not advance between states. Fpga design flow aldec rev 3 george mason university. If you do not intend to run postsynthesis simulation, you can turn off the generation of the postsynthesis hdl netlist by rightclicking the configure design flow button on the libero design flow window. Professional services strategy and programs that address security before, during and after development. Synplify premiers fast logic synthesis mode now offers up to a 4x speed improvement over traditional logic synthesis when using a single processor. Tutorial on fpga design flow based on aldec activehdl. Synplify creates an edif netlist but modelsim uses the designer exported hdl netlist. Postsynthesis is the simulation performed after synthesis. Postsynthesis and postimplementation timing simulations are supported for verilog only. Postsynthesis simulation of all state machines in the design will detect the fault, if it is present. For the post synthesis simulation we need to use the vhdl netlist model of the from ese 382 at stony brook university.
Example of performing a timing simulation of a synplify verilog hdl design with a custom megafunction variation with the modelsim software. Simulating a design with xilinx libraries unisim, unimacro. Synplify software supports the latest vhdl and verilog language constructs including systemverilog and vhdl2008. The read write check on ram option on the device panel lets the synthesis tool insert bypass logic around the ram to prevent a simulation mismatch between the rtl and post synthesis simulations. There is no impact on the file content but there is a runtime penalty. Synplify pro fpga logic synthesis software is the industry standard for producing highperformance and costeffective fpga designs. The synthesis software does not insert bypass logic around the ram that read and write to the same address simult aneously. Synthesis can be done either by using xilinx xst or synplify premier dp.
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