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Electronic signal to synchronize circuits
especially synchronous digital circuits, a clock signal (historically also known as logic beat) is an electronic logic signal (voltage or current) which oscillates
Clock_signal
Clock which synchronizes its time using radio transmitters
radio controlled clock. The radio controlled clock will contain an accurate time base oscillator to maintain timekeeping if the radio signal is momentarily
Radio_clock
Signal able to be decoded without an outside source of synchronization
telecommunications and electronics, a self-clocking signal is one that can be decoded without the need for a separate clock signal or other source of synchronization
Self-clocking_signal
Instrument for measuring, keeping or indicating time
A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals
Clock
Clock signal used to synchronise digital audio devices
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
Word_clock
Spreading the frequency domain of a signal
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
Spread_spectrum
Signal used to represent data as a sequence of discrete values
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
Digital_signal
Device used to synchronize a circuit
A clock generator is an electronic oscillator that produces a clock signal for use in synchronizing a circuit's operation. The output clock signal can
Clock_generator
Technical standard
carry several signals at once including a clock signal to synchronize the data. In serial communications, multiple single-ended signals are serialized
Low-voltage differential signaling
Low-voltage_differential_signaling
Extracting timing information in serial communication
their own clock is not precisely synchronized with the transmitter, they may sample the signal at the wrong time and thereby decode the signal incorrectly
Clock_recovery
Type of computer networking connection
bits). The data is clocked at 25 MHz to achieve 100 Mbit/s throughput. The original MII design has been extended to support reduced signals and increased speeds
Media-independent_interface
Crossing in digital electronic design
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
Clock_domain_crossing
Synchronous serial communication interface
(variously called slave, follower, target, sub...) by driving the clock and chip select signals. As there is no formal standard, some manufacturers introduce
Serial_Peripheral_Interface
Central computer component that executes instructions
these early synchronous CPUs ran at low clock rates compared to modern microelectronic designs. Clock signal frequencies ranging from 100 kHz to 4 MHz
Central_processing_unit
Electronic circuit with two stable states
dedicated clock signal (known as clocking, pulsing, or strobing). Clocking causes the flip-flop either to change or to retain its output signal based upon
Flip-flop_(electronics)
Signal used as a reference to determine the time of day
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
Time_signal
Misaligned timing signals from different paths
sourced clock signal arrives at different components at different times due to gate or, in more advanced semiconductor technology, wire signal propagation
Clock_skew
Clock signal broadcast via MIDI
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
MIDI_beat_clock
Frequency at which a CPU chip or core is operating
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
Clock_rate
Power management technique for synchronous digital circuits
by removing the clock signal when the circuit, or a subpart of it, is idle. Clock gating saves power by pruning part of the clock tree distribution
Clock_gating
Clock type
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
Quartz_clock
Type of logic circuit
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
Sequential_logic
Time of day voice service
A speaking clock or talking clock is a live or recorded human voice service, usually accessed by telephone, that gives the correct time. The first telephone
Speaking_clock
Concept in electronics
analog electronics, Clock feedthrough is the result of the coupling between control signals on the analog switch and analog signal passing through the
Clock_feedthrough
Class of electrical signals
receivers. Precision clocks are sometimes manufactured by interfacing a PPS signal generator to processing equipment that aligns the PPS signal to the UTC second
Pulse-per-second_signal
Pseudo-digital circuit
can be used to change the phase of a clock signal (a signal with a periodic waveform), usually to enhance the clock rise-to-data output valid timing characteristics
Delay-locked_loop
Clock deviation from perfect periodicity
true periodicity of a presumably periodic signal, often in relation to a reference clock signal. In clock recovery applications it is called timing jitter
Jitter
Computer networking standard
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
Synchronous_Ethernet
Electronic control system
These properties are used for clock synchronization, demodulation, frequency synthesis, clock multipliers, and signal recovery from a noisy communication
Phase-locked_loop
Telecommunications coding technique
bit synchronization when a separate clock signal is not available. Since NRZ is not inherently a self-clocking signal, some additional synchronization technique
Non-return-to-zero
Device storing number of times an event or process occurred
counts and stores the number of positive or negative transitions of a clock signal. A counter typically consists of flip-flops, which store a value representing
Counter_(digital)
Clock that monitors the resonant frequency of atoms
An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on the fact that atoms have quantised energy levels
Atomic_clock
Sub-nanosecond accuracy time transfer using Ethernet
As the local and master clock frequencies are locked, this clock signal is just a delayed version of the master clock signal. By calculating the phase
White_Rabbit_Project
Type of computer memory
Intel Arrow Lake. These modules include a component to re-drive the clock signal to help reach higher speeds. AMD does not support CUDIMM, though Zen
DDR5_SDRAM
Communication signaling technique
or quad pumping) is a communication signaling technique wherein data are transmitted at four points in the clock cycle: on the rising and falling edges
Quad_data_rate
Line code used in early magnetic data storage
Modified frequency modulation encodes the clock signal and the data in a single "clock window". Unlike FM, a clock bit is only written when needed to achieve
Modified_frequency_modulation
Electronic timer used to detect and recover from computer malfunctions
clock signal as shown in the block diagram below, or they may have independent clock signals or in some cases the watchdog may have no clock signal at
Watchdog_timer
Synchronization interface for electronic musical instruments
signals, clock (tempo) and run/stop. Both signals are TTL compatible, meaning the low state is 0 V and the high state is about +5 V. The clock signal
DIN_sync
Electromechanical device
logic which is paced by a clock signal. However, the incoming encoder signals are asynchronous with respect to the interface clock because their timing is
Incremental_encoder
Standard for serial communication
the DTE can provide a clock signal, called transmitter timing (TT, pin 24) for transmitted data. Data is changed when the clock transitions from OFF to
RS-232
Power management mechanism for PCI Express devices
off PCI Express link completely, including the reference clock signal, until a dedicated signal (CLKREQ#) is asserted, and results in greater power reductions
Active_State_Power_Management
is the iterative design process of assuring all signals satisfy the timing requirements in a clocked synchronous circuit. The goal is to guarantee correct
Timing_closure
Clock that is depent on another clock for its accuracy
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
Slave_clock
Serial interface
receives the beginning of the clock signal (1), it automatically freezes its current data. With the first rising edge (2) of the clock sequence, the MSB of the
Synchronous_Serial_Interface
Line code
of Data and Strobe will yield a clock signal. Also, it specifies the simplest means of generating the Strobe signal for a given Data stream. Data strobe
Data_strobe_encoding
Type of clock
the time automatically using signals from atomic clock-synced time signal radio stations such as WWV, making the clock accurate and immune to time reset
Alarm_clock
Type of computer memory
the rising and falling edges of the clock signal, effectively doubling the data rate without increasing the clock frequency. This technique, known as
DDR_SDRAM
Design methodology for combinatorial logic integrated circuits
in that dynamic logic uses a clock signal in its implementation of combinational logic. The usual use of a clock signal is to synchronize transitions
Dynamic logic (digital electronics)
Dynamic_logic_(digital_electronics)
Type of computer memory
its external pin interface is coordinated by an externally supplied clock signal. DRAM integrated circuits (ICs) produced from the early 1970s to the
Synchronous dynamic random-access memory
Synchronous_dynamic_random-access_memory
Computer memory unit using cascaded flip-flops
flip-flop is connected to the input of the next. They share a single clock signal, which causes the data stored in the system to shift from one location
Shift_register
6-pin mini-DIN connector for connecting keyboards and mice to a PC compatible computer
device-generated clock signal toggles. When the host pulls Clock low, the device must immediately stop transmitting and release Clock and Data to both
PS/2_port
Second generation of double-data-rate synchronous dynamic random-access memory
falling edges of the bus clock signal), DDR2 allows higher bus speed and requires lower power by running the internal clock at half the speed of the data
DDR2_SDRAM
Digital circuit synchronized by clock signal
which the changes in the state of memory elements are synchronized by a clock signal. In a sequential digital logic circuit, data is stored in memory devices
Synchronous_circuit
Reprogrammable computer hardware technology
in this way is called a heterogeneous FPGA. Since clock signals (and often other high-fan-out signals) are normally routed via special-purpose dedicated
Logic_block
Method of computer bus operation
rising and falling edges of the clock signal and hence doubles the memory bandwidth by transferring data twice per clock cycle. This is also known as double
Double_data_rate
Process of varying one or more properties of a periodic waveform
form of a message signal modulated onto a carrier signal to be transmitted. For example, the message signal might be an audio signal representing sound
Signal_modulation
Form of serial communication lacking synchronization control signals
continuously synchronized by a common clock signal. Synchronization (clock recovery) is done by data-embedded signal: the data stream contains synchronization
Asynchronous serial communication
Asynchronous_serial_communication
Family of digital modulation methods
quadrature-modulated signal must share a clock or otherwise send a clock signal. If the clock phases drift apart, the demodulated I and Q signals bleed into each
Quadrature amplitude modulation
Quadrature_amplitude_modulation
Finite-state machine whose output values are determined only by its current state
global clock signal changes. Typically the current state is stored in flip-flops, and a global clock signal is connected to the "clock" input of the
Moore_machine
Serial communication with clock signal
that the clocks in the transmitting and receiving devices are synchronized – running at the same rate – so the receiver can sample the signal at the same
Synchronous serial communication
Synchronous_serial_communication
Topics referred to by the same term
by a clock circuit or global clock signal Integrated circuit, a set of electronic circuits on a small "chip" of semiconductor material Mixed-signal integrated
Circuit
Type of electronic circuit
frequency of most radio transmitters, and to generate the clock signal in computers and quartz clocks. Crystal oscillators often use the same circuits as LC
Electronic_oscillator
Design for testing technique for integrated circuits
signal that is added to a design. When this signal is asserted, every flip-flop in the design is connected into a long shift register. Clock signal which
Scan_chain
Time signal transmitted from Anthorn Radio Station in Cumbria, England
NPL operated as a public corporation. The signal, also known as the MSF signal (and formerly the Rugby clock), is broadcast at a highly accurate frequency
Time_from_NPL_(MSF)
Method of data transmission in which bits are conveyed in parallel
clock speed, the parallel channel would be eight times faster. A parallel channel may have additional conductors for other signals, such as a clock signal
Parallel_communication
MIPS microprocessor
various clock signals from a master clock signal generated externally. For the operating frequency, the R4000 multiplies the master clock signal by two
R4000
Digital electronic system with no global clock signal
centralized clock signals. An asynchronous system, in contrast, has no global clock. Asynchronous systems do not depend on strict arrival times of signals or messages
Asynchronous_system
Type of electronic component
oscillating signal of a specific frequency. Like the similar quartz crystal, they are used in oscillators for purposes such as generating the clock signal used
Ceramic_resonator
Flip-flop logic gate
converts the clock signal's rising edge to a very narrow pulse. The PTD consists of a delay gate (which delays the clock signal) and the clock signal itself
Pulse_transition_detector
Standard for serial communication between devices without host computer
the data is transmitted in an asynchronous format, namely without a clock signal. The CAN specifications use the terms dominant bits and recessive bits
CAN_bus
Technique used for timing symbols on a digital interface
transmitting device send a clock signal along with the data signals. The timing of the unidirectional data signals is referenced to the clock (often called the
Source-synchronous
Electronic system for generating any of a range of frequencies
is to address the two long-standing problems in the field of on-chip clock signal generation: arbitrary frequency generation and instantaneous frequency
Frequency_synthesizer
Self-synchronizing line code
clock signals are combined to form a single two-level self-synchronizing data stream. Each data bit is encoded by the presence or absence of a signal
Differential Manchester encoding
Differential_Manchester_encoding
Array of logic gates that are reprogrammable
synchronous circuitry that requires a clock signal. FPGAs contain dedicated global and regional routing networks for clock and reset, typically implemented
Field-programmable_gate_array
Simulation technique in computer hardware design
a signal is the time elapsed for a signal to arrive at a certain point. The reference, or time 0.0, is often taken as the arrival time of a clock signal
Static_timing_analysis
Circuitry that controls reading from and writing to a computer's floppy disk drive
required additional circuitry to perform specific tasks like providing clock signals and setting various options. Later designs included more of this functionality
Floppy_disk_controller
Electronic oscillator circuit
to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio
Crystal_oscillator
Personal computer, invented in 1970
1404A silicon gate MOS shift registers. The clock signal period was 1 microsecond (equivalent to a clock speed of 1 MHz), but the program speed averaged
Kenbak-1
Factor influencing processor clock speed
computing, a clock multiplier (also known as a CPU multiplier or bus/core ratio) determines how many times faster the processor’s internal clock runs compared
CPU_multiplier
Informal measure of rate of computer data operations
is transferred on both the rising and falling edge of the clock signal. If its internal clock runs at 100 MHz, then the effective rate is 200 MT/s, because
Transfers_per_second
1 MHz clock (by dividing the clock signal in half ten times, rather than operating a phase-locked loop or digital divider to divide such a clock signal by
TU_(time_unit)
Device or program that encodes/decodes audio data in some bitstream format
converter (ADC) and digital-to-analog converter (DAC) running off the same clock signal. This is used in sound cards that support both audio in and out, for
Audio_codec
Line code used in early magnetic data storage and Ethernet
either low then high, or high then low, for equal time. It is a self-clocking signal with no DC component. Consequently, electrical connections using a
Manchester_code
Ratio used in computer memory
operating clock frequency of computer memory in accordance with front side bus (FSB) frequency, if the memory system is dependent on FSB clock speed. Along
Memory_divider
SI unit of frequency
clock rate expressed in megahertz (MHz) or gigahertz (GHz). This specification refers to the frequency of the CPU's master clock signal. This signal is
Hertz
Detail of the global positioning system
magnitude of error should be expected. The GPS makes corrections for receiver clock errors and other effects but there are still residual errors which are not
Error analysis for the Global Positioning System
Error_analysis_for_the_Global_Positioning_System
Digital circuit without clock cycles
a sequential digital logic circuit that does not use a global clock circuit or signal generator to synchronize its components. Instead, the components
Asynchronous_circuit
2024 Intel product line
driver to traditional unbuffered DIMMs that is able to regenerate the clock signal locally on the DIMM for better stability at high memory speeds. With
Arrow_Lake_(microprocessor)
Combinational digital circuit
that control ALU operation. The external sequential logic is paced by a clock signal of sufficiently low frequency to ensure enough time for the ALU outputs
Arithmetic_logic_unit
Serializer/deserializer pair in network equipment
[clarification needed] An embedded clock SerDes serializes data and clock into a single stream. One cycle of clock signal is transmitted first, followed by
SerDes
1995 supercomputer series
(giving a 32-CPU STREAM bandwidth of 360 gigabytes per second). The clock signal is distributed via a fiber-optic harness to the processors. The T90 series
Cray_T90
Audio and video interface
sequentially), and the clock signal carried as a common mode signal of this pair. From MHL 3 onwards, the method for carrying the clock signal changed to being
Mobile_High-Definition_Link
Average number of instructions executed for each clock cycle
called instructions per clock, is one aspect of a processor's performance: the average number of instructions executed for each clock cycle. It is the multiplicative
Instructions_per_cycle
Transmission of data at irregular intervals
communication is transmission of data, generally without the use of an external clock signal, where data can be transmitted intermittently rather than in a steady
Asynchronous_communication
8-bit central processing unit
as changing the input clock signal, which meant the 8502 could easily switch between 2 MHz and the 6510's 1 MHz. When the clock runs at double-speed,
MOS_Technology_8502
Twenty-first letter in the Greek alphabet
set in mathematics is sometimes also erroneously mistaken for phi. A clock signal in electronics is often called Phi or uses the symbol. In emulsion and
Phi
First transistorized computer in the USA
because it used vacuum tubes to generate the clock signal.[citation needed] The 30 watts of power for the 1 MHz clock in the TRADIC was also supplied by a vacuum
TRADIC
Coordination of events to operate a system in unison
through satellite navigation signals and other time and frequency transfer techniques. Time-keeping and synchronization of clocks is a critical problem in
Synchronization
source-synchronized clock for each configuration. In cable applications, it uses one twisted pair in order to transmit a clock signal, and on the remaining
Channel_Link
Clock outside Greenwich Observatory, London
The gate clock distributed the time publicly; another time signal of the observatory was the time ball, since 1833. The time ball only signalled 1 pm (13:00)
Shepherd_Gate_Clock
CLOCK SIGNAL
CLOCK SIGNAL
Surname or Lastname
Americanized spelling of German Krock.English
Americanized spelling of German Krock.English : perhaps a metonymic occupational name for a potter, from Middle English crock ‘pot’.
Girl/Female
Muslim
Clock
Boy/Male
Biblical Hebrew
A flock.
Surname or Lastname
German and Dutch
German and Dutch : from Middle High German bloch, Middle Dutch blok ‘block of wood’, ‘stocks’. The surname probably originated as a nickname for a large, lumpish man, or perhaps as a nickname for a persistent lawbreaker who found himself often in the stocks.English : possibly a metonymic occupational name for someone who blocks, as in shoemaking and bookbinding, from Middle English blok ‘block’.Jewish (Ashkenazic) : Americanized spelling of Bloch (see Vlach).Adriaen Coertsz Block was a Dutch-born merchant-explorer who traded along the CT coast and Long Island shortly after Hudson’s voyage to the region in 1609. Block Island, between the north fork of Long Island and RI, which he used as a base of operations, is named after him.
Biblical
a flock
Boy/Male
Hebrew
Of God's flock.
Surname or Lastname
English
English : from a Middle English personal name Clac, which is from Old English Clacc or the Old Norse cognate Klakkr. As a personal name this is from a word meaning ‘lump’ and may have been used as a nickname for a large or thickset man. Reaney suggests that it could also be from clacker ‘chatterer’.
Girl/Female
Arabic, Muslim
Clock
Boy/Male
Gaelic
Little cloak.
Boy/Male
Indian, Malayalam
Clock
Surname or Lastname
English
English : see Cleek.Possibly an Americanized spelling of German Klick, Jewish Glick, or German and Jewish Glück (see Gluck).
Surname or Lastname
English
English : topographic name for someone who lived on a small plot of land, from Middle English plocke ‘small piece of ground’.Americanized spelling of German Ploch.Variant of German Block.
Girl/Female
Arabic
Lock; Awesome
Boy/Male
Indian
Latch, Door lock
Surname or Lastname
English
English : of uncertain origin; possibly a nickname for someone with thick curly hair, from Old French floc ‘stable of wool’. Alternatively, it may be a metonymic occupational name for a shepherd, from Old English flocc ‘herd’, ‘company’.German : unexplained.German (Flöck) : variant of Flück (see Fluck), or from a pet form of a personal name formed with Old Saxon flÅd ‘flood’.
Boy/Male
Hebrew
Of God's flock.
Surname or Lastname
English
English : metonymic occupational name for a locksmith, from Middle English, Old English loc ‘lock’, ‘fastening’.English : topographic name for someone who lived near an enclosure, a place that could be locked, Middle English loke, Old English loca (a derivative of loc as in 1). Middle English loke also came to be used to denote a barrier, in particular a barrier on a river which could be opened and closed at will, and, by extension, a bridge. The surname may thus also have been a metonymic occupational name for a lock-keeper.English, Dutch, and German : nickname for a person with fine hair, or curly hair, from Middle English loc, Middle High German lock(e) ‘lock (of hair)’, ‘curl’.Americanized spelling of German Loch.
Boy/Male
British, English, Irish
Woods; Fortified Place; Bright; Radiant
Girl/Female
German, Hebrew, Irish
Flock of Sheep
Boy/Male
Basque, Biblical, French, German, Hebrew
A Flock; Herd
CLOCK SIGNAL
CLOCK SIGNAL
Girl/Female
Tamil
India, Female deer
Biblical
Jahazah, quarrel; dispute
Boy/Male
Hindu
Female
Native American
Native American Sioux name EHAWEE means "laughing maiden."
Boy/Male
Gujarati, Hindu, Indian, Kannada, Marathi, Tamil, Telugu
Beauty; Glory; Ornament
Boy/Male
Indian
Inward, Within, Secret
Girl/Female
Hindu, Indian
Want; Desire
Boy/Male
Muslim
A tree which has scent
Girl/Female
Assamese, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Red Sandal Wood
Male
Norwegian
Norwegian Latinized form of Scandinavian Gunnar, GUNNERIUS means "soldier, warrior."
CLOCK SIGNAL
CLOCK SIGNAL
CLOCK SIGNAL
CLOCK SIGNAL
CLOCK SIGNAL
v. t. & i.
To call, as a hen. See Cluck.
n.
The hammer in the lock of a firearm.
v. t.
To coat with flock, as wall paper; to roughen the surface of (as glass) so as to give an appearance of being covered with fine flock.
v. t.
To cover with, or as with, a cloak; hence, to hide or conceal.
v. i.
To give off crock or smut.
n.
The striking of a clock.
v. t.
A section of a railroad where the block system is used. See Block system, below.
adv.
Entirely; quite; as, chock home; chock aft.
v. t.
To stop or fasten, as with a wedge, or block; to scotch; as, to chock a wheel or cask.
v. t.
To lay up in a crock; as, to crock butter.
n.
To shape on, or stamp with, a block; as, to block a hat.
v. t.
To fasten with a lock, or as with a lock; to make fast; to prevent free movement of; as, to lock a door, a carriage wheel, a river, etc.
v. t.
To move with the sound of a click.
v. t.
To fasten in or out, or to make secure by means of, or as with, locks; to confine, or to shut in or out -- often with up; as, to lock one's self in a room; to lock up the prisoners; to lock up one's silver; to lock intruders out of the house; to lock money into a vault; to lock a child in one's arms; to lock a secret in one's breast.
v. t.
To prevent ingress or access to, or exit from, by fastening the lock or locks of; -- often with up; as, to lock or lock up, a house, jail, room, trunk. etc.
n.
The act of cocking; also, the turn so given; as, a cock of the eyes; to give a hat a saucy cock.
n.
A click. See 3d Click, 2.
v. t.
To flock to; to crowd.
n.
A lock of wool or hair.