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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 ...
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.
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.
Switching power dissipation is directly proportional to the switching activity (α), load capacitance (C), Supply voltage (V), and clock frequency (f) as: P = α·C·V 2 ·f. Switching activity means transition to different levels. Glitches are dependent on signal transitions and more glitches results in higher power dissipation.
During the evaluation phase, Clock is high. If A and B are also high, the output will be pulled low. Otherwise, the output stays high (due to the load capacitance). Dynamic logic has a few potential problems that static logic does not. For example, if the clock speed is too slow, the output will decay too quickly to be of use.
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).
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However, chip design trends point to event simulation gaining relative performance due to activity factor reduction in the circuit (due to techniques such as clock gating and power gating, which are becoming much more commonly used in an effort to reduce power dissipation). In these cases, since event simulation only simulates necessary events ...