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39 Threads found on Set False Path
Can I always set false path for violation occurring at inter-clock-path ? ( provided , CDC is taken care in RTL ) Yes. How to solve Intra-clock-path timing violations ( setup and hold ) Provided that you follow good FPGA design practices (mainly using dedicated clock routes) - hold time (...)
Hello All, I wanted to know what all are the options I have when I have to fix set up violation in a design ( with no hold time violation ) without changing anything in rtl. What are the stratagies I can use ( not the tool stratagies of vivado ) Thanks
Hello, MCP is multicycle path during capture only as we are running shift at low speed. If we provide multiple cycles, it will detect the non scan flops in between 2 scan flops. It will detect MCPs also, Suppose we set sequential depth as 3, it will detect MCP with 3 cycles and also non scan flops which are in between scan flops.
There are two clock made constraint as create_clock. If I don't set false_path about these two clock. After CTS, are these two path balance ? What action does CTS handle false_path constraint ? For CTS, these two clocks are treat as independent and have not balance ?? Thanks.
What are the minimum required constraints to be given while synthesising a design? 1. clock period 2. input delay 3. output delay 4. clock uncertainity 5. clock latency 6. set load Other than the constraints listed above, what are the basic constraints required?
Hi All, I am using Xilinx's Vivado 2013.3 for generating the *.bin file. There are a lot asynchronous paths in my design. for example if I have grouped the signals like : # in CLK1 domain set GROUP1 ; set GROUP1 ; set GROUP1 ; # in CLK2 domain set GROUP2 [get_cells {sig_
a false path is one that would usually be analysed by the timing analyser, but for whatever reason, you dont want it to do it. An example would be signals that cross a clock domain boundary, or maybe something that you set once and doesnt change for a very long time, and having a "failing" path wont really have an effect on (...)
in clock domain crossing, you set false path for hold while doing synthesis because two clocks are asynchronous and timing cannot checked. But you set set_max_delay and set_min_delay on these paths. so that data should reach after specified delay.
Just want to know the opinion of the forum. Is it preferred to use exactly the same set of constraints for both synthesis using DC, and STA using PrimeTime? Does the synthesis tool use the false path specifications, or max transition constraints? Or can we use a simpler constraint file to do synthesis, and then use a more elaborate (...)
Is it necessary to set false path during FPGA synthesis? How can it be done if it is yes? Regards
hai friends i have a setup violation in a path starting in the Q pin of a flipflop followed by some logic blocks and ending in the D pin of the same flip flop how can i over come this can i set false path or multicycle path help me........... thank you
Hi, I am confused which should be set for asynchronous control signal, false path or recovery and removal constrain? Could you tell me how to choose and why? Thanks!
Not Always. CDC(Clock Domain Crossings) analysis required very much in bigger SOC's. If these clock domains are not interacting in any of the functional modes, you can always set false paths. If its interacting, you cant set false path untill and unless , you have any other mechanisam to (...)
First set the path as false path between the clock domains. Then 1. If there is no data going through between these clocks then fine no problem. U can carry on with the STA. 2. If not then u need to have FIFO design with sufficient depth, so that there r no data lost. Which is normally written in the verilog code itself by (...)
If I understand your question correctly, you are asking if input to output path can be set as false path. This can be or can not be set as a false path depending on the design. Generally these paths will be analysed with constraints applied at input and (...)
I want to synthesize a Clock domain crossing design. Do i need to set a false path from clk1 to clk2 as explained by jbeniston?
check this set_clock_groups notes - Altera Forums
Hi all, In my design i have scan flipflop contains sd(set),rd(reset),clk,si(scan input),q(output),d(signal input).sd(tied to 1) For static signals like SD and all other static signals how the tool taken care when the Timing closure stage.whether it is taken as a falsepaths?.
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.
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 (...)