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Synthesis Constraints

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.sdc file contains bunch of constraints, operating conditions etc, given the synthesis tool to optimize the design. You do not generate it from any script (tcl). you write it.
Quick things to look at apart from what "chids" has mentioned: 1. Look out for High Fan-out nets 2. Look at the levels of logic created by the synthesis tool, correlate that with your RTL code and see if you re-write in a better way so that tool can implement it in a better way 3. Look at the constraints, whether they are correct/realistic, some
CTS = clock tree synthesis.
Hi I want to know how would you synthesize a design having multilple clock domains with clock domain crossing paths between the two clock domains. What would be the constraints for CDC paths? How would you verify the result of synthesis Please reply thoroughly. Thanks a lot
hey check below link ASIC-SoC-VLSI Design: synthesis constraints
Basically if 1==2 and 2==3 then 1==3 (if you use correct compare constraints). Use GUI to locate and analyze mismatches. During N2N synthesis you could make some optimization (ex. retiming) that needs additional constraints to LEC.
Did you analyze first why its failing by that much large negative slack? what kind of path is it ? I2C or C2C or I2O path etc? You need to then look at the path and see if some constraints are missing ...Dont expect the tool to solve everything especially if its failing by more 30-40% of the clock period... This applies to all synthesis tools irres
Hi What are all the reasons to do gate level simulation? Is it only to see if gate level circuit is functionally operating or not because of the reason though the RTL verification shows the RTL to be working functionally but the gate level may not work functionally because of error in synthesis? Regards
There are many types of constraints - false, multicycle, set_input_delay, set_output_delay, etc Can anyone give a complete list of the order is which constraints have priority? Thanks,
There are three main constraints in ASIC synthesis Timing, Area and Power. All these has trade-offs. If you wants better timing you may require large area and power. If you require small area your performance will effected.
No. Timing constraints have to be added in the appropriate file type depending on your synthesisor. You can set up clocks in testbenches though, but not synthesis. Clock periods would have no use in synthesis anyway.
Even if you are doin a chip level synthesis, you will have external designs that interact with your design. Hence it is required to meet timing for this path ie. reg of external design -> o/p pin of external design -> i/p pin of your design -> reg in your design. The constraint values are determined from from previous design experience or rough
Hi Srinivasan the RTL compiler which is a synthesis tool shld generate this sdc file. During synthesis all teh timing constraints will be used to generate an sdc file. Try finding how to write out an SDC file using RTL compiler. give some very basic timing constraints like max delay, min delay, max capacitance for (...)
Hi Kumar, Constraint it using a SDC file..ur output will be declared as a reg by default in your HDL u just need to specify your design constraints and timing constraints in a file to your synthesis tool
SDC - Synopsys Design constraints This file is used for all implementation tools starting from synthesis, timing analysis, place&route,dft,fpga..etc. This is very important file to ensure proper operation of your design, fpga, silicon SDF - Standard Delay Format Used to convey the timing information of a design after implementation (it can be gene
You won't achieve a stable phase shift without a PLL. Logic gate delays can be used, but must be expected to vary with PVT (process, voltage, temperature) over a range of about 1:2. With respective timing constraints, a synthesis tool will try to achieve specified timing relations of clocks and signals by utilizing routing delays. Alternatively, yo
Well, you synthesis the Verilog/VHDL (i'd prefer verilog to VHDL, considering its easier) code to get the synthesized gate level netlist. Then, along with the proper timing constraints, you take it through the physical design steps(floorplan + powerplan+placement and finally the routing) and write out the gds. There are many EDA tools that allow yo
Hi all, I had done logical synthesis using SYnplify Premier & PAR with ISE..All timing constraints were meeting while after logic synthesis doing physical synthesis is giving timing error (-ve slack)....how it could happen...Can anybody explain it...
I think you need study basic concept about synthesis constraints contain environment constraint and functional constraint, 200MHz is just clock constraint
I've a design full custom I wanto to synthetize and optmize my design. A part design rules, I can put optimization constraint. How can estimate input delay. I start in a top down synsthesis optimization flow after synthesis how can I estimate optimization constraint like input/ouput delay on timing paths? When do I have to put them ? I've read syno