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Avoid Setup Violation

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26 Threads found on Avoid Setup Violation
Hi All, once the chip was manifactured we can avoid setup violation only decrecing the frequency. regards, ramesh.s
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 (...)
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 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
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
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
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 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, 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
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.
Solution is: 1. slow down the clock 2. delay the clock by assert a buffer. 3. choose another FF to avoid violation. i have a question about the 2nd solution. Will it cause other timing violations for a synchronous design ? when we do the dc, don't we think the clock network is ideal?
How to avoid the Set-up & Hold Time violations?....
Hi.. Is there any option to add Buffers to avoid hold time violation in FPGA. If router failed to fix hold time violation, can a user fix it manually. Thanks
-- avoid clock skew as much as possible........
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 (...)
Hey u can see that there is negative slack. So there is setup violation. U need to avoid that. try again by giving different values till u get a 0 or positive slack.
If the data path is short between reg to reg, then there is no prob of setup violation, but there is a chance of data getting overwritted by another data signal if clock signal comes slow, inorder to avoid this type of situation v check hold time and solve it.... thanku:D
because data is supposed not to toggle at where capturing edges of clock is present to avoid metastability.
Yes, this maybe. But why the cell library designer will design such a gate cell? so why rise delay and fall delay are almost similiar?? is it to avoid this problem??
u didnt specify your clock freq. i think your skew is far as slack is concerned, it is desirable to have a small positive slack but try to avoid negative slack. in case of hold violation, the hold time depends on the fastest path( the path which takes least time to propagate in your logic). so if there is an hold violation
Clock skew is normally defined as the time it takes to reach the different flip-flops... If the threr is a long clk path between 2 flops, thr will be more skew... To avoid this kind of prob, we use H-tree connection...
For shift register design, setup time isn't a problem. And hold time is more important to pay attention on it. To avoid feedthru problem, it's better to insert some small delay between each register when you design it manually. Hope it helps :)
@pps: Deciding factor for WHAT? setup is deciding factor for "calculating max frequency". The design wont work properly if you have setup or hold violations on the path. But you can avoid the setup voilation by operating at a lower frequency which is not possible in the case of hold violations.