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90 Threads found on Setup And Hold Check
lots of corners. check the foundry documentation. you probably have some lots of corners: setup ones, hold ones, process variation, temperature, etc.
At first sight, it looks like a trivial setup or hold time violation. Did you check with setting d earlier and holding it longer?
check this link Fixing setup & hold Violations
Hi All, i've a confusion why worst case report is considered as the Max delay violation(setup violation) and Best case report as Min delay(hold violations). and why we always calculate the hold violations at the launching flop. thanks in advance, Arjun
So before looking to the setup/hold time report, you must have the trans/cap violations clean or so small than the impact is reduce. So rca - Lets consider PT - so all you are saying is first of all check for Max trans/cap, fix it, and then you check setup/hold (...)
Hi Esakki raja , Follow the below links. Thanks, Alam
Will setup and hold time for D_latch and D_FF will be same if they are fabricated via same technology? In multi-clock design, In case of FF we wait for next rising/falling edge and check the setup time at that particular instant While in latch we dosent wait for next (...)
Hello sir. I am reading about lockup latches. Sir how exactly lockup cell removes the hold violation? and sir why we do check setup analysis in next clock and not at the same clock? If first clock for destination clock laging the source clock and during that time if data can settle then what (...)
Suppose a clock is generated from another clock and hence in the synthesis SDC we provided the create generated clock and also the create clock to create the generated clock and the source clock respectively? Is there any necessity to provide in the synthesis SDC when should setup and hold (...)
many ways to fix setup violation after synthesis. 1. size cell and minimize data path delay. 2. check hold margin and useful skew. 3. use LVT cell if all ways can not work. you 'd better add more margin to re-synthesis or re-design.
To check setup : The setup multiplier Can be N. The launch will happen at 0th clock cycle and setup capture will happen at Nth clock cycle. To check zero cycle hold check : set_multicycle_path -hold 1 The rule is: (...)
hello every one... can anybody clearly explain about checking of setup and hold violations in clock gating path
May not be required.Just check the setup and hold margins from the datasheet..
Hai all, What is Recovery check,Removal check? please could u tell me Eqs for Recovery check,Removal check like setup time and hold time ? Thank u............
you can use data_check command in primetime to check signals which are not in the setup and hold format in the library. The data check commands are designed for the purposes of timing checks between handshaking systems.
It will depend upon the magnitude of your tran violations, if magnitude is above the library limits definitely it needs to be fixed, as your library is not characterized for such a transition, and the delay value calculated by tool corresponding to such transition may be inaccurate. So, actually you might be violating setup but shown non violated b
Hi All, Here is a question from my last interview: GIVEN: Blocks A, B, and C (see the picture below - click on it in order to zoom it in) Block 'B' timing requirements: setup Time: 4nSec hold Time: 2nSec Clock Period: 20nS Block 'C' timing requirements: setup Time: 3nSec hold Time: 1nSec (...)
1): It seems there is a command called: "set_clock_gating_check". and by default, DC/PT will check the clock gating celling setup/hold requirement, which are all set to "0". 2): For scenarios, I think it's PVT+chip working mode (such as function mode, scan mode, MBIST mode)
So, As I understand whichever of the characterized libraries we use the synthesizer (in my case Cadence RC) gives us the same netlist. After that we run STA analysis with worst case stdlib to check setup time violations and best case to check hold time... Please, correct me if I'm wrong. (...)
Need little bit explanation on Why we fix setup Violations and then fix hold violations