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This clock-gating logic is generally in the form of "integrated clock gating" (ICG) cells. However, the clock-gating logic will change the clock-tree structure, since the clock-gating logic will sit in the clock tree. Clock gating example. Clock-gating logic can be added into a design in a variety of ways: It can be coded into the register ...
The term is also used for the goal that is achieved, when such a design has reached the end of the flow and its timing requirements are satisfied. The main steps of the design flow, which may be involved in this process, are logic synthesis, placement, clock-tree synthesis and routing. A single reference clock is often cascaded and synthesized ...
Clock signal and legend. In electronics and especially synchronous digital circuits, a clock signal (historically also known as logic beat) [1] is an electronic logic signal (voltage or current) which oscillates between a high and a low state at a constant frequency and is used like a metronome to synchronize actions of digital circuits.
The reference, or time 0.0, is often taken as the arrival time of a clock signal. To calculate the arrival time, delay calculation of all the components in the path will be required. Arrival times, and indeed almost all times in timing analysis, are normally kept as a pair of values - the earliest possible time at which a signal can change, and ...
Reducing the clock rate or undervolting usually reduces energy consumption; it is also possible to undervolt the microprocessor while keeping the clock rate the same. [2] New features generally require more transistors, each of which uses power. Turning unused areas off saves energy, such as through clock gating.
In digital electronic design a clock domain crossing (CDC), or simply clock crossing, is the traversal of a signal in a synchronous digital circuit from one clock domain into another. If a signal does not assert long enough and is not registered, it may appear asynchronous on the incoming clock boundary.
For clocked-logic circuits, the clock gating technique is used, to avoid changing the state of functional blocks that are not required for a given operation. As a more extreme alternative, the asynchronous logic approach implements circuits in such a way that a specific externally supplied clock is not required. While both of these techniques ...
Clock gating in more conventional synchronous designs is an approximation of the asynchronous ideal, and in some cases, its simplicity may outweigh the advantages of a fully asynchronous design. Performance (speed) of asynchronous circuits may be reduced in architectures that require input-completeness (more complex data path).