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63 Threads found on edaboard.com: Fix Setup Violation
Hello all , There are times, when I am not allowed to change the RTL, and all the clocking structure in the design are already optimized. Still I face situations where I have negative slack ( setup as well as hold ) Some times by trying few strategies in Vivado, the tool solves the timing violations, but what if it doesn't ? Question 1 : Ca
dear all, if i have 2 flip-flops , ff1 clock pin is connected to clk ff2 clock pin is connected to gated clock..... my doubt... if i found either hold r setup violation on this path with repsect to +ve edge.. then how i can fix the violation can any one guide me thanks in advance bhaskarg
To fix the setup violation, one need to reduce the data path delay. So as you only suggested that it could be done through either up-sizing the cell or adding the buffer. Adding the buffer will need extra space as well as routing resources where as up-sizing the buffer will have advantage in terms of area. Adding the buffer will ONLY help (...)
Hi Try to fix max tran and max cap first then there will be decrease in the max fanout violations.I think max fanout can be ignored.
Hi folks, I have seen few zero cycle ( set_multicycle_path 0) setup paths in design. Can you explain why there is a need of having 0 cycle setup path? what is a advantage of the same? How do we check hold violations for these kind of paths? These paths are violating setup time. How can fix this issue (...)
The Synthesis tool wont look at the Hold at all, because Hold can be optimized/fixed during the PD ( mainly after CTS ).
Hi, How do we fix Clock Gating setup violation and Clock Tree Pulse Width violation ? Thanks, Aditya
This is a part of the timing report I obtained after the nanoroute stage of my design in Cadence Encounter 9.1. In order to fix the set up violations, I would like to insert buffers or upsize the cells. But how do I know which cells should I upsize or where should I insert the buffers? Can anybody please help?? Thanx in advance Path 1: VIOLATED
Hi, i am very new to PD and i am working on this block which seems to have a very tight setup/hold margin. i see that the setup violating path has a lot of hold fix cells put in and if i try to reduce the dly or remove the delay cells, it breaks the hold . if i even try vt swapping or upsizing, the hold breaks. there is no noise in the (...)
setup violation means not enought time for the data to respect the setup condition relative to the next clock edge. If the delay due to the two inverters + routing is less than the delay due to the buffer, yes that could help to fix the setup violation.
Hello I am using cadence encounter and need to fix drv violations of max cap and max tran after placement stage. one way is to insert a buffer. What is the command to do that? thanks in advance
1- is the design is timing clean before the postroute? a- if yes, it is also DRV clean, is there huge routing hot spot, which could have been not properly handle before? b- if no, fix the setup before routing.
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 (...)
is there any step after synthesis can fix this problem? can i guide the P&R to have some usefull clock skew for that?
Hi All , I have internal and external violations in my design . By Internal I mean Reg to reg paths, By external I mean " Input pin to reg " and " reg to output pin " . How to I go about fixing them ?? Should I remove my internal and external setup violations first and then fix hold ? Or should I (...)
Hi~ i have question about opencores i2c slave simulation results. Q1) how can i use "sda_dly" for fix 0 hold margin? Q2) how can i fix timing violation in i2c simulation result? Q3) why happened timing violation Warning! Timing violation $setup( posedge (...)
oki .. actual ans -- of how we can fix these path will be very large. But in simple words there are different ways or u can say that there are different priorities of fixing .. but at the end the no of ways are same. There are 3 basic paths where the setup/Hold violations may occur: - inputs-to-register path -- (...)
YES. These clock transition violations need to fix. The timing is valid if below condition is met. INPUT transition <= LIB transition. Output Cao <= Lib cap value . now its upto signing off team to risk the design or schedule . Recommendation is to fix . Depends again on the magnitude and corresponding path setup and (...)
during the synthesis phase you only fix the setup time. Hold time is only done after clock tree in PnR tool.
Hi Chandra, There may be different approaches to fix it; 1 - If you don't want to modify any routing: - a. Replace any of the cells on the timing path with their slower "pin compatible" versions. In your case the hold violation is very small, and I guess changing 1 cell should be sufficient. - b. Replace the flop with a differen