Sage-Tips

What is path grouping?

A path group is a collection of paths that service a particular type of program request. Every path defined for a logical record must be included in a path group; you define at least one path group for each logical record. An OBTAIN path group contains paths that service program requests to OBTAIN a logical record.

What is path in VLSI?

Data path is a pure combinational path. It can have any basic combinational gates or group of gates. Launch path. Launch path is part of clock path. Launch path is launch clock path which is responsible for launching the data at launch flip flop.

What is critical path in VLSI?

The critical path is the longest path in the circuit and limits the clock speed. 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.

What is Path group in timing analysis?

Timing paths are grouped into path groups according to the clock associated with the endpoint of the path. • There is a default path group that includes all asynchronous paths. • There are two timing path types: max and min.

What is false path in VLSI?

False path is a very common term used in STA. It refers to a timing path which is not required to be optimized for timing as it will never be required to get captured in a limited time when excited in normal working situation of the chip.

What is feedthrough path in VLSI?

Feedthrough blocks are the communication channels present at the top chip level with many hierarchical blocks to ensure smooth interaction between two or more blocks. Since it is like a channel between blocks so port positions and size are hard fixed.

What are path groups false paths and multi-cycle paths?

False paths: These are paths in a design that exist but changes in source register are not required to be captured at the destination register within one clock cycle. Multi-Cycle paths: Paths where data is not required to reach the capture flop within one clock cycle.

Why do we use false paths?

Definition of false path: A timing path, which can get captured even after a very large interval of time has passes, and still, can produce the required output is termed as a false path. A false path, thus, does not need to get timed and can be ignored while doing timing analysis.

What is clock push pull VLSI?

Clock pushing generally refers to delaying the clock at capture edge to fix the setup violations. ( Positive Skewing) Clock pulling refers to making the clock late at the launch stage to fix the hold violations. (