Propagated clock latency is used for post-layout, after. final clock tree generation. Ideal clock latency provides an estimate. of the clock tree for pre-layout.
What is a propagated clock?
Real clocks have sources. Real clocks can be ideal or propagated. An ideal clock incurs no delay through the clock network. A propagated clock is the opposite of an ideal clock. A virtual clock has no sources.
What is Set_propagated_clock?
Provides a list of clocks, ports, pins, or cells. …
How do you set a clock latency?
You access this dialog box by clicking Constraints > Set Clock Latency in the TimeQuest Timing Analyzer, or with the set_clock_latency Synopsys® Design Constraints (SDC) command. Specifies additional delay (that is, latency) in a clock network.
What is ideal clock in VLSI?
The ideal clock has no distribution tree, it is directly connected at the same time to all flip flop clock pins. The second phase comes when CTS inserts the clock buffer to build the clock tree into the design that carries the clock signal from the clock source pin to the all flip flops clock pins.
What is virtual clock?
– A virtual clock can be defined as a clock without any source or in other words a virtual clock is a clock that has been defined, but has not been associated with any pin/port. – It does not physically exist in the design but it does exist in the memory.
What is Set_output_delay?
The set_output_delay command sets output path delays on output ports. relative to a clock edge. Output ports are assumed to have no output. delay unless specified.
What is Slew in VLSI?
Transition Delay. Transition delay or slew is defined as the time taken by signal to rise from 10 %( 20%) to the 90 %( 80%) of its maximum value. This is known as “rise time”.
What is skew and latency?
Clock Skew between two sink pins is the the difference in the clock latency between them. If the capture clock latency is more than the launch clock, then it is positive skew. … If the capture clock latency is less than the launch clock, then it is negative skew. This helps hold checks.
What is clock delay?
Clock Latency is the general term for the delay that the clock signal takes between any two points. … Clock Latency is the total delay that a clock signal takes to reach a sink or a destination pin, which typically is the clock pin of the flip-flops or the latches, from a clock source.
What is skew and jitter?
Clock skew is two different flip flops receive the clock signal at slightly different time due to difference in clock net length but clock jitter is on the same flip flop but the position of clock edge moves edge to edge due to some noise in oscillator.
What is jitter clock signal?
Jitter is the timing variations of a set of signal edges from their ideal values. Jitters in clock signals are typically caused by noise or other disturbances in the system.
What is master clock in VLSI?
A master clock is a clock defined using the create_clock specification. When a new clock is generated in a design that is based on a master clock, the new clock can be defined as a generated clock.