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83 Threads found on edaboard.com: Set False
How to add the formula below into FEKO or HFSS? Need to use Mathlab? θ = cos-1( -1) where 2Npie ≤ Φ ≤ 4 Npie set N = 3. Please help
May be the serial port control registers are wrongly set.......
Or you can set a false path on all of these if you want to keep your log file clean and document your work properly.
Hello, Can anyone give me an insight as to what the following setting in synopsys does ? set timing_enable_non_sequential_checks true/false I dont have access to the manpages and i'm trying to understand what this does. If anyone can past the manpage of this particular config also that would be helpful. Thanks,
What is finally concluded? This is a really a interesting topic for me. Please comment. CIE40 ; Will setting set auto_wire_load_selection "false" will solve this problem/ Thanks
hi it seems synpify ignores my false path constraints. i set up false paths: # Clock to Clock # define_clock_delay -rise {fpga_pciclk} -rise {Inst_businterfaces.ldt_clk} -false define_clock_delay -fall {x32_clk_better} -rise {x2510_clk8} -false define_clock_delay -rise {x32_clk_better} (...)
At Speed test uses two high speed functional clock pulse to test the delay of the combinational lgoic between registers. However, some combinational logic will take more than one cylce to propagate. So the two clock pulses are not enough for these logic. usually, we will set false paht of these paths. Another way is to use pipelineing to make
For Design compiler... ## ## Run after elaboration ## set_fix_multiple_port_nets -all -buffer_constants set verilogout_equation false set verilogout_no_tri true set write_name_nets_same_as_ports true set verilogout_higher_designs_first false set (...)
Hi, If the clocks are from the same source(when you say you are generating the 1MHz clock from 8 MHz then these two clocks should belong to the same domain) you need to set the 1MHz clock as a derived clock and define the corresponding parameters. When you do this the tool will automatically check the timing of the signals that cross the freq do
To preserve Flip flop from being removed by DC, apply the below command : set hdlin_preserve_sequential true
By default Synopsys-DC syntheis tool will remove all the unused flipflops or latches and if it has not removed them then it might be due to the below variable : set hdlin_preserve_sequential false If you are using some other synthesis tool, it might also have some variable with which you can have u r flops preserved.
Could anybody give me a complete conclusion in what stances should we set false path? As I know, 1) different clock domain; 2) the path don't need to do timing analysis.
Hi, I have written a tutorial on dc, I guess it will help you. It gives actual commands used to set constraints, and the page also gives example to set false paths, and much more. hope it helps, Kr, Avi
Hello, Can anyone explain in more details about the question below?. Thanks in advance. 1. How flattening during synthesis can improve the speed? 2. When set false path is used in synthesis? 3. When set multi-cycle path is used in synthesis?
You need to confirm with the datasheet of IO PAD usage and set the according constraints in sdc.
yes, just set the path as false path will done the job
What's the convergence? 1%? and set more point for interpolating
exception is mainly include false path and multi cycle path. false path are set for any logic which not required to analyse timing. and multicycle path is that path which required more than one cycle compare to launch clock to execute its function
If you are setting set_auto_disable_drc_nets -constant to false DC adds tie cells based on the max_fanout attribute of these tie cells. If you set the variable to false before your initial compile -scan, then Design Compiler connects the scan enable pin of every scan flop to a tie0 cell.
You can go to to see example commands to set false path.