Table of Contents
How VLSI reduce insertion delay?
Insertion delay is the time taken for clock to reach the CK pin of the flop from its source. By adding buffers to the path with least buffers in a launch-capture pair of buffers, the difference in the latency for capture and launch (i.e the skew) is reduced.
What are different types of delay models in VLSI?
Delay
- Propagation delay time.
- Contamination delay time.
- Rise time.
- Fall time.
- Edge rate.
What is input delay in VLSI?
Input delay is the time at which the data arrives at the input pin of the block from external circuit with respect to reference clock.
What is latency in physical design?
Latency: It is the amount of time a clock signal takes to propagate from the original clock source to the sequential elements in the design. Source latency: It is the delay from the clock source to the clock definition pin in the design.
How do we achieve a better insertion delay?
To improve max insertion delay,
- Reduce maximum time of flight.
- Reduce propagation delay of logic cell.
- Reduce critical path in the logic cell.
- Alternatively, expand maximum insertion delay by re-timing.
What are delay models?
The transport delay is used to model the delay introduced by wire connection or a PCB connection. The inertial delay models the delay introduced by an analog port, which means, it is analogous to the delay in devices that respond only if the signal value persists on their inputs for a given amount of time.
What are different types of delay models?
There are two different delay models in VHDL: transport and inertial, which is used per default.
What is stage delay in VLSI?
Often, it makes sense to combine the calculation of a gate and all the wire connected to its output. This combination is often called the stage delay. The delay of a wire or gate may also depend on the behaviour of the nearby components. This is one of the main effects that is analyzed during signal integrity checks.
Why latency is important in VLSI?
Latency is the time needed for an input change to produce an output change; latency can be expressed as a length of time or, in synchronous circuits, as a certain number of clock cycles. Throughput refers to the rate at which data can be processed.
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.