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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 ...
A gate is replaced by a logically equivalent but differently-sized cell so that delay of the gate is changed. Because increasing the gate size also increases power dissipation, gate-upsizing is only used when power saved by glitch removal is more than the power dissipation due to the increase in size.
Physical design: explicit power/ground nets and connectivity can be specified per cell or block. Analysis: different timing library data for cases where the same cell is used in different power domains; Power control logic Specification of level shifter logic - special cells needed when signals traverse between blocks of different supply voltage.
Power gating affects design architecture more than clock gating.It increases time delays, as power gated modes have to be safely entered and exited. Architectural trade-offs exist between designing for the amount of leakage power saving in low power modes and the energy dissipation to enter and exit the low power modes.
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.
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 ...
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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.