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Clock signal information


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 a synchronous logic circuit, the most common type of digital circuit, the clock signal is applied to all storage devices, flip-flops and latches, and causes them all to change state simultaneously, preventing race conditions.

A clock signal is produced by an electronic oscillator called a clock generator. The most common clock signal is in the form of a square wave with a 50% duty cycle. Circuits using the clock signal for synchronization may become active at either the rising edge, falling edge, or, in the case of double data rate, both in the rising and in the falling edges of the clock cycle.

  1. ^ Cite error: The named reference Ferranti_1968 was invoked but never defined (see the help page).

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Clock signal

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especially synchronous digital circuits, a clock signal (historically also known as logic beat) is an electronic logic signal (voltage or current) which oscillates...

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Clock

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Clock generator

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A clock generator is an electronic oscillator that produces a clock signal for use in synchronizing a circuit's operation. The signal can range from a...

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Radio clock

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radio controlled clock. The radio controlled clock will contain an accurate time base oscillator to maintain timekeeping if the radio signal is momentarily...

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Serial Peripheral Interface

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with some number of peripheral (sub) devices by driving the clock signal and chip select signal(s). Motorola's original specification (early 1980s) uses...

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Digital signal

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clock signal is a special digital signal that is used to synchronize many digital circuits. The image shown can be considered the waveform of a clock...

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Clock skew

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sourced clock signal arrives at different components at different times due to gate or, in more advanced semiconductor technology, wire signal propagation...

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Clock rate

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frequency). The clock distribution network inside the CPU carries that clock signal to all the parts that need it. An A/D Converter has a "clock" pin driven...

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Spread spectrum

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driven by a clock signal and, because of its periodic nature, has an unavoidably narrow frequency spectrum. In fact, a perfect clock signal would have...

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Word clock

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electronics, a word clock or wordclock (sometimes sample clock, which can have a broader meaning)[further explanation needed] is a clock signal used to synchronise...

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Central processing unit

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these early synchronous CPUs ran at low clock rates compared to modern microelectronic designs. Clock signal frequencies ranging from 100 kHz to 4 MHz...

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Clock domain crossing

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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...

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Quartz clock

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creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally...

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MIDI beat clock

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MIDI beat clock, or simply MIDI clock, is a clock signal that is broadcast via MIDI to ensure that several MIDI-enabled devices such as a synthesizer or...

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Synchronous Ethernet

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the transference of clock signals over the Ethernet physical layer. This signal can then be made traceable to an external clock. The aim of Synchronous...

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Time signal

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operated chimes on public clocks; however, audible signals (even signal guns) have limited range. Busy seaports used a visual signal, the dropping of a ball...

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Jitter

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true periodicity of a presumably periodic signal, often in relation to a reference clock signal. In clock recovery applications it is called timing jitter...

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Clock recovery

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own local clock is not precisely synchronized with the transmitter, they may sample the signal at the wrong time and thereby decode the signal incorrectly...

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Slave clock

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slave clock is a clock that depends on another clock, the master clock. Modern clocks are synchronized through the Internet or by radio time signals, to...

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Sequential logic

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processors. The clock signal must be distributed to every flip-flop in the circuit. As the clock is usually a high-frequency signal, this distribution...

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Clock gating

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the clock signal when the circuit, or a subpart of it, is not in use or ignores clock signal. Clock gating saves power by pruning the clock tree, at the...

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Atomic clock

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An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels. Electron...

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DDR SDRAM

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edges of the clock signal) to double data bus bandwidth without a corresponding increase in clock frequency. One advantage of keeping the clock frequency...

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