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Avoid Setup Violation

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Hi All, once the chip was manifactured we can avoid setup violation only decrecing the frequency. regards, ramesh.s
There may more than one path through the combinational logic between the two FFs. We consider the maximum delay path between the two FFs for setup and minimum delay path for hold violations. So, if we increase the positive skew, we can avoid the setup violation with respect to the maximum delay path. But (...)
Hi all can any body tell, does Positive Slack helps to avoid setup violations. If yes how.
Hi everyone Is there any examples regarding clock designing and how to reduce setup violation and hold violation regards sandeep.
to avoid hold violation, insert buffers/inverters in that path. to avoid setup violation, restructure the design such that the critical path will have less delay, or reduce the operating freq. in general, we should have setup clean prelayout design. hold violations may (...)
what is setup violation and HOLD violation?? differnce bet' positive and negative skew.
what we should do if we get setup violation during tapeout .does the chip works or what we should do
Hi everyone, I am a learner of encounter (cadence) and meet the setup violation on the inclkSrc2reg group, which is shown as follows: Path 1: VIOLATED setup Check with Pin \DFF_1048/Q_reg /CLK Endpoint: \DFF_1048/Q_reg /D (^) checked with leading edge of 'CK' Beginpoint: g35 (v) triggered by leading edge of 'CK' (...)
Hi, Is it true that replacing buffer with 2 inverter in datapath can fix setup violation ? If so please clarify
Hi guys, I'm using a behavioral clock gating module as follows Enable signal is retimed by a falling edge flop then the output of the flop gates the clock using an AND gate. All the flops driven by the gated clock are rising edge flops. I receive clock gating setup violation at relative to clock rising edge at the input of the AND gate. Fo
Hi, bdu_vlsi, What kind of design are you working on? You need to modify you design to avoid setup violation. Hope this help you GCK
Hope to avoid setup violation they have defined falling edge of clk
Thanks for the reply, It would of great help if you explain with a setup and hold violation example, where by changing frequency we can avoid setup violations , whereas the same is not possible with hold violation elimanation.
hi,guys, i encounter a problem with gate-level simulation, run in modelsim,it appear the following : ------------------------------------------------------------ r: ../../libs/modelsim_asic/fsc0g_d_sc.v(18445): $setup( negedge D &&& ~SEL:2841 ps, posedge CK:3 ns, 267 ps ); Time: 3 ns Iteration: 5 Instance: /../../../../../reg_coeff_data_reg
hello;;;;;;;;; can a latch have setup and hold time violation and to say that what is setup and hopldtime violation for a latch....... can anyone explain............ thank'z'
Hi Mahantesh, Hold violations are more critical than set-up.I would fix the hold and then try set-up.Bcoz to avoid set-up problems you can reduce the frequency of the design to make it work.But if a hold problem persists your chip functionally fails Touching the database when you are having a tapeout tomorrow is the last thing you want to hap
can anybody tell me how setup and hold time violates means what precautions should i take to prevent setup and hold timing violations. if it is there how can i remove both of these. plz send ur ans differently for both setup and hold
Please check the problem , it seems that there is something missing. In general , the condition you have to satisfy to avoid setup time violation is : Tcq +Tpd +Tsetup < Tclk + Tskew where Tcq is the Clock-to-Output delay of the first FF, Tpd is the propagation delay, Tsetup is the (...)
Set up time in nothing but the time period for which the data input to the flop should be valid before the transition of the clock occurs... i.e normally rising edge of the clock... I think the data here is in sufficient... you have to mention the clock period and the set up time of the flop... you can avoid set up time violation by increasing t
I have problem finding the settup violation for the circuit on the attachment. Can anyone help to find the setup violation and how to fix the problem??? Thank you so much!!!
Hi, After CTS I am having either setup violation or hold violation in some of the reg to reg path. In this with which violation you will proceed further. Prithivi.
w.r.t to the equation ..... "LATE" refers to the "maximum delay values"" "EARLY" refers to the "minimum delay values" setup chk is always performed with the "MAX" values in the DP, cos u need to ensure tht the timing can be met evn for hte "max" delay values for ur combi logic ... wats the point in c
Hi friends, Timing reports on pre-CTS stage showed setup violations due to some cells with high fanout (wns was around -10). After pre-CTS optimization, wns was -0.8. Whether it is ok to proceed with CTS and fix the violation later or change some constraints and have the placement done again? Thanks, useless_skew
what should we do if we get any setup & hold violation during tape out oter than playing with freq
Can someone tell me how a flipflop with setup time violation function? a flop with hold time violation will act as a simple buffer. In the same way how it acts with setup time violation? Please let me know
Hi All This is an interesting question that I Came across in an interview process.. I was asked that when the ASIC is taped out and it is in lab to test you figure out that it is not working fine. Now it is not a logical fault but some sort of metastability issue. Q1. How can you figure out that it is a settup time /Hold time violatio
hi Kumar, Theoritically it can happen. and I am agree with "somg" till a certail limit. you should know what is the setup/hold voilation and how can it be avoided... to avoide the setup voilation means -> data should be present TS time before the capture clock edge where TS is the setup time of (...)
If i have setup and hold violation on a D pin of a flipflop. What can be the reason and how to solve it.
Hello All, Can anyone guide me, what is the flip flop output when there is a hold violation and what is the output when there is a setup violation? In both cases the output is same as previous or don't care(0 or 1 whatever we don't know). Thanks & Regards, Maulin Sheth
is there any step after synthesis can fix this problem? can i guide the P&R to have some usefull clock skew for that?
hello all, while fixing the setup violation for one path, other paths gets affected means when i'm reduced slack of maximum violated path from -800ps to -600ps, but i observed that another path's slack violation goes to -950ps. why this is happening? i'm trying to swap cell means upsizing cells from data path to reduce delay. (...)
The Main Problem with latches is the STA/DFT incompatibility as "yeewang" said. Also glitches in the enable pin of the latches cause improper functionaing of the system. What RMM says is to avoid creating latches UNKNOWINGLY by defining a "else" condition for an if statement .. and default case for a CASE statement. Latches on the other side ta
according to conception,the setup time and hold time is simple, but it look like confused, who can present some example for me
hi, In my design ,there is a clock whose frequency can be 2M, 4M, .. 24M, how to synthesis it in design compiler to avoid setup and hold timing violation anytime. Regards.
Hi I'm using Altera Maxplus2 software for my fpga design. During the simulation, there are timing violations. I'm not very familiar with fpga based design, I'm use to Synopsys Design Compiler, which is an ASIC. Thus, in fpga how do u fix these timing violations?? Please enlighten me.... thanx in advance, -no_mad
What are the steps done after facing a violation in our design?Is modifiying the rtl the only way or do you have any methodology for that. Please refer me any site for STA if there is any.
Hi Please clarify this : If i have to choose between two circuits, one with setup time violation and other with hold time violation, which should be my choice? What are ways of fixing setup and hold time violations in rtl code? Thanks in advance
Hi, 1) If I have both setup and hold violations and only one day for submitting my design then which one should I go for and why? 2) How to avoid setup violation? Regards Sandeep.
Hi can any body explain for these questions........ 1)if your design have one setup violation then can you send your chip into Market ?if yes or no please justify that ? 2)if your design have one hold violation then can you send your chip into market ?if y or N please justify your answer ? 3)for reduceing hold (...)
Hi, How to fix Timing violations(setup & Hold time violations)? What are all the things that has to be taken care while fixing it?
Dear Friend? If i have n umber of setup violationd and n number os hold vioations, Which one to consider first ?
The question is in the image.Please help.
I am fixing my setup violations in design by reducing delay of my data path. so will it creat hold violations for these paths. or what are the conditions for which it will creat hold violations at the time of fixing setup?
How changing the driver cell can help fix the setup? Also, why should we change the driver strength of the cells which has cross talk effects to fix setup?
Thank you sir. Can you tell me, how to fix hold time violation. Other than reducing frequency, is there any method to avoid setup violation. Thanks
Hi, Whether Positive Skew is good for setup or not? Plz tell me little bit detail... Thanks DIN
IF agressor and victim are moving in the same direction how do we get setup violation?
Hi, If we have a design with setup violation than what we should do to remove those violation from the design. And in case of hold violation what are the different technique to remove hold violation from the design. Regards, Tauqueer
Hi, I am using Synopsys DFT compiler for Scan Insertion in XG Mode. During Pre and post design rule checks I am facing C4 'rst not able to Capture Data while other clocks are Off' violation. I am declaring my reset port like this : set_dft_signal -type reset -port rst -active_state 1 I am using the autofix like this set_dft_signal -type
The files in Crisis.rar seem to simulate fine for me, although I don't know what the correct output should be. I tried synthesizing in ISE 10.1i, and the post-route simulation looks pretty similar to the behavioral simulation. However, I had to change the test bench delay from #18 to #5 to avoid an input setup violation during post-route (...)