Global Information Lookup Global Information

Clock skew information


Clock skew (sometimes called timing skew) is a phenomenon in synchronous digital circuit systems (such as computer systems) in which the same sourced clock signal arrives at different components at different times due to gate or, in more advanced semiconductor technology, wire signal propagation delay. The instantaneous difference between the readings of any two clocks is called their skew.

The operation of most digital circuits is synchronized by a periodic signal known as a "clock" that dictates the sequence and pacing of the devices on the circuit. This clock is distributed from a single source to all the memory elements of the circuit, which for example could be registers or flip-flops. In a circuit using edge-triggered registers, when the clock edge or tick arrives at a register, the register transfers the register input to the register output, and these new output values flow through combinational logic to provide the values at register inputs for the next clock tick.

Ideally, the input to each memory element reaches its final value in time for the next clock tick so that the behavior of the whole circuit can be predicted exactly. The maximum speed at which a system can run must account for the variance that occurs between the various elements of a circuit due to differences in physical composition, temperature, and path length.

In a synchronous circuit, two registers, or flip-flops, are said to be "sequentially adjacent" if a logic path connects them. Given two sequentially adjacent registers Ri and Rj with clock arrival times at the source and destination register clock pins equal to TCi and TCj respectively, clock skew can be defined as: Tskew i, j = TCi − TCj.

and 24 Related for: Clock skew information

Request time (Page generated in 0.8006 seconds.)

Clock skew

Last Update:

Clock skew (sometimes called timing skew) is a phenomenon in synchronous digital circuit systems (such as computer systems) in which the same sourced clock...

Word Count : 2151

Clock drift

Last Update:

is correlated with clock skew, which can be detected by observing timestamps (under the server's real identity). Bit slip Clock skew Effects of relativity...

Word Count : 1073

Skew

Last Update:

arch, not at a right angle Clock skew Transitive data skew, an issue of data synchronization Skew (fax), unstraightness Skew (antenna) a method to improve...

Word Count : 176

Timing failure

Last Update:

system to meet limits set on execution time, message delivery, clock drift rate, or clock skew. Asynchronous distributed systems cannot be said to have timing...

Word Count : 58

Clock signal

Last Update:

the clock distribution network helps ensure that critical timing requirements are satisfied and that no race conditions exist (see also clock skew). The...

Word Count : 2165

Digital clock manager

Last Update:

produced by Xilinx). A digital clock manager is useful for manipulating clock signals inside the FPGA, and to avoid clock skew which would introduce errors...

Word Count : 122

Serial communication

Last Update:

serializer and deserializer, or SerDes) and to outstrip its disadvantages (clock skew, interconnect density). The migration from PCI to PCI Express is an example...

Word Count : 986

Spread spectrum

Last Update:

misalignment, or clock skew. A phase-locked loop on the receiving side needs a high enough bandwidth to correctly track a spread-spectrum clock. Even though...

Word Count : 1934

Clock synchronization

Last Update:

difficulties managing time at smaller scales, there are problems associated with clock skew that take on more complexity in distributed computing in which several...

Word Count : 1538

Ntpd

Last Update:

files include the drift file, which ntpd uses to correct for hardware-clock skew in the absence of a connection to a more accurate upstream time-server...

Word Count : 491

DLL

Last Update:

formulae in conjunctive normal form Delay-locked loop, a device to reduce clock skew in digital circuits Dillon County Airport (IATA code), an airport near...

Word Count : 157

Retiming

Last Update:

position of the registers, clock skew scheduling moves their temporal position by scheduling the arrival time of the clock signals. The lower bound of...

Word Count : 919

CockroachDB

Last Update:

to reproduce consistency issues because nodes with high variations in clock skew can be removed from clusters, applications can rely on external consistency...

Word Count : 862

Azuro

Last Update:

to clock network implementation that produces lower power clock networks with lower clock skew and shorter insertion delay using a smaller area of the integrated...

Word Count : 303

Parallel communication

Last Update:

doubling the number of bits sent at once doubles the data rate. In practice, clock skew reduces the speed of every link to the slowest of all of the links. Cable...

Word Count : 691

Hashcash

Last Update:

the current date, it is invalid. (The two-day window compensates for clock skew and network routing time between different systems.) The recipient's computer...

Word Count : 2644

Clock domain crossing

Last Update:

delays, timing skew, etc., the size of a clock domain in such a synchronous system is inversely proportional to the frequency of the clock. In early computers...

Word Count : 753

Flexible single master operation

Last Update:

It is critically important that computer clocks are synchronized across the forest because excessive clock skew causes Kerberos authentication to fail....

Word Count : 1504

Public key certificate

Last Update:

hours or days prior to the moment the certificate was issued, to avoid clock skew problems. Not After: The time and date past which the certificate is no...

Word Count : 4444

Device fingerprint

Last Update:

California, San Diego showed how TCP timestamps could be used to estimate the clock skew of a device, and consequently to remotely obtain a hardware fingerprint...

Word Count : 3692

SCSI

Last Update:

capability. The primary reason for the shift to serial interfaces is the clock skew issue of high speed parallel interfaces, which makes the faster variants...

Word Count : 3710

Asynchronous circuit

Last Update:

signals sent over clock distribution network often end up at different times at different parts. This problem is widely known as "clock skew".: xiv  The maximum...

Word Count : 5984

Signal integrity

Last Update:

(SERDES) links called "lanes." Such serial links eliminate parallel bus clock skew and reduce the number of traces and resultant coupling effects but these...

Word Count : 3817

Serial Attached SCSI

Last Update:

does not require terminator packs like parallel SCSI. SAS eliminates clock skew. SAS allows up to 65,535 devices through the use of expanders, while Parallel...

Word Count : 3500

PDF Search Engine © AllGlobal.net