How does the jitter affect the setup and hold paths?
In other words, jitter in clock period makes the setup timing more tight. Or it decreases setup slack for single cycle timing paths. Effect of clock jitter on hold slack for single cycle paths: Going on the same grounds as setup slack, hold check will be from edge 1 -> edge 1 only.
Can clock jitter affect setup and hold time?
Since the jitter affects the clock delay of the circuit and the time the clock is available at sync points, setup and hold of the path elements are affected by it. Depending on whether the jitter causes to clock to be slower or faster, there can be setup hold or setup violations in an otherwise timing clean system.
What happens when setup and hold time is violated?
Setup time is defined as the minimum amount of time before the clock’s active edge that the data must be stable for it to be latched correctly. … Violation in this case may cause incorrect data to be latched, which is known as a hold violation.
What is clock skew and clock jitter?
As an approximation, it is often useful to discuss the total clock timing uncertainty between two registers as the sum of spatial clock skew (the spatial differences in clock latency from the clock source), and clock jitter (meaning the non-periodicity of the clock at a particular point in the network).
Why is uncertainty added in hold time?
hold time always less than setup time
at synthesis stage, more concern on reduce path timing, so setup uncertainty is more important to add margin to design. hold is easy fix, so less important, when do timing check, you should set a more consertive hold uncertainty .
What is setup and hold time expression?
Setup time is defined as the minimum amount of time BEFORE the clock’s active edge by which the data must be stable for it to be latched correctly. … Hold time is defined as the minimum amount of time AFTER the clock’s active edge during which the data must be stable.
What is the setup slack time in NS?
As the clock frequency is given as a 100 MHz, time period = 1/frequency = 10 ns. So, for this timing path, setup slack value is 3 ns and hold slack value is 5 ns.
Why do we check hold on same edge?
The level must be stable for some hold time after each edge in order to be captured correctly. This is independent of clock period and hence is measured off of the same edge, except with parameters that are the opposite of that for the setup time. In this case, shortest clock net delays, earliest jitter, etc.
How is slack setup calculated?
Setup Slack = Required time – Arrival time (since we want data to arrive before it is required)
- Setup Slack = Required time – Arrival time (since we want data to arrive before it is required)
- Arrival time (max) = clock delay FF1 (max) +clock-to-Q delay FF1 (max) + comb.
What is the effect of clock skew on setup and hold?
Setup is the next cycle check, and positive skew relaxes the setup check and negative skew further tightens it. Hold is the same cycle check, and negative skew relaxes the hold check and positive skew further tightens it.
What is the significance of set up time and hold time for a flip-flop?
The Hold time is used to further satisfy the minimum pulse width requirement for the first (Master) latch that makes up a flip flop. The input must not change until enough time has passed after the clock tick to guarantee the master latch is fully disabled.
Why is setup and hold time required?
Setup and hold checks in a design: Basically, setup and hold timing checks ensure that a data launched from one flop is captured at another properly. … Setup check ensures that the data is stable before the setup requirement of next active clock edge at the next flop so that next state is reached.