43 results about "Time Stamp Counter" patented technology

A timestamp-based all digital phase locked loop is utilized for clock synchronization for Circuit Emulation Service (“CES”) over packet networks. The all digital phase locked loop at a CES receiver includes a phase detector, a loop filter, a digital oscillator and a timestamp counter. The all digital phase locked loop enables the CES receiver to synchronize a local clock at the receiver with a clock at a CES transmitter, where indications of transmitter clock signals are communicated to the receiver as timestamps. The phase detector is operable to compute an error signal indicative of differences between the timestamps and a local clock signal. The loop filter is operable to reduce jitter and noise in the error signal, and thereby produce a control signal. The digital oscillator is operable to oscillate at a frequency based at least in-part on the control signal, and thereby produce a digital oscillator output signal. The timestamp counter operable to count pulses in the digital oscillator output signal, and output the local clock signal.

The invention discloses an abnormal waveform recording method for an oscilloscope with a high capture rate. The method comprises the following steps: arranging a time stamp counter in an FPGA (Field Programmable Gate Array); binding a time stamp with a real-time clock at a DSP (Digital Signal Processor) end; comparing waveform data acquired by using the FPGA with an abnormal waveform detection template; when an abnormal waveform appears, storing abnormal waveform data and a corresponding time stamp in a DDR (Double Data Rate); and calculating the generation time of the abnormal waveform data via a corresponding relation between the time stamp and the real-time clock at the DSP end so as to realize time positioning of abnormal waveforms. According to the method, only abnormal waveform data are stored, and normal waveform data are not stored, so that the abnormal waveform capturing capacity can be increased; and meanwhile, time positioning of abnormal waveforms is also realized, and manual observation and recording are not required. Abnormal waveforms can be displayed by adopting multiple display modes, so that abnormal waveforms can be analyzed conveniently.

A device management system includes one or a plurality of scanning devices for reading and converting a document image of a contract document, an approval document, a receipt, or the like into electronic form to generate scanned document data; a time-stamping server for adding a time stamp to the scanned document data; a time-stamp counter included in each of the scanning devices for counting the number of times the time stamp is used; a document management server for receiving and storing the time-stamped scanned document data; a control panel for causing one of the scanning devices to perform scanning operation; and an administrative PC connected to each of the scanning devices and collectively managing the number of times the time stamp is used by the scanning devices.

A time synchronization device performs a time synchronization process with a device that provides first and second time values. The time synchronization device includes a packet processing circuit, a time counting circuit, and a processor. The packet processing circuit includes a timestamp counter having an N-bit length, and the packet processing circuit provides first to third time counting values. The processor calculates the first offset value based on the first and second time values and the first and second time counting values; calculates the first adjustment value based on the first offset value and the reciprocal of the frequency of the time counting circuit; calculates a second quotient value and a second remainder value based on the first adjustment value and the N-bit length; and calculates the receiving time of the second synchronization packet based on the N-bit length, the second quotient value, and the third time counting value.

Systems and methods (“utility”) for providing more accurate clock skew measurements between multiple CPUs in a multiprocessor computer system by utilizing the cache control or management protocols of the CPUs in the multiprocessor system. The utility may utilize a time stamp counter (TSC) register of the CPUs in the multiprocessor computer system to detect the clock skew between the various CPUs in the system. Further, the delay between measurements of the TSC registers of the CPUs may be minimized by utilizing the features of the hardware cache control or management protocols of the computer system, thereby providing more accurate clock skew measurements.

The invention discloses a method for realizing the timestamp synchronization of an active optical line terminal (OLT) and a standby OLT. The method comprises that: the active OLT synchronously transmits round trip time (RTT) values with all online optical network units (ONU) to the standby OLT; and the standby OLT selects a reference ONU, and sets a value of a local timestamp counter according to a timestamp in a multipoint control protocol (MPCP) frame and an RTT value of the active OLT with the reference ONU after receiving the MPCP frame of the reference ONU. The invention simultaneously discloses a system for realizing the timestamp synchronization of the active and standby OLTs. By the scheme provided by the invention, timestamp counters of the active and standby OLTs in an Ethernet passive optical network (EPON) backbone optical fiber protection system can be effectively synchronized, and the offline state of the ONU caused by timestamp drift in handover can be avoided, thereby ensuring that the handover can be finished quickly. Moreover, requirements on the ONUs are relatively lower, and compatibility with all conventional ONU equipment can be achieved.

Technologies are directed to a detector to identify a side channel attack between virtual machines. According to some examples, an inter-processor interrupt (IPI) rate of a first virtual machine (VM), a time stamp counter (TSC) rate of a second VM, and a cache miss ratio (CMR) of a third VM may be monitored. A side channel attack may then be detected based on the IPI rate, the TSC rate, and the CMR.

The present application concerns a system for tracing a product item (102, 104) on a production line (100) comprising a control unit (10) and a timestamp counter (11), wherein the control unit (10) isconfigured to receive a product signal related to the product item (102, 104) from at least one peripheral device (12, 14, 16, 18, 20, 22, 24, 26). According to the invention, the control unit (10) is further configured to carry out the method steps of receiving a plurality of product signals each relating to a product item (102, 104) and a peripheral device (12, 14, 16, 18, 20, 22, 24, 26), generating a plurality of event signals, wherein each event signal is based on one of the product signals, arranging the event signals in a sequence corresponding to an order in which the product signalswere received, and associating a timestamp generated by the timestamp counter (11) with the sequence.

The invention provides an SMV packet generator for a digital energy meter communication protocol test. The SMV packet generator comprises a man-machine interactive system which comprises an industrial control machine which is externally connected to a first DDR2, a DOM, an input keyboard, an LCD and a first Ethernet module respectively, an embedded DSP system which comprises a BF609 module which is externally connected to a second DDR2, a FLASH and a second Ethernet module respectively, a time set module which comprises an antenna, a GPS receiver, a time stamp counter and a comparator which are connected in order, and a power supply module. The output end of the comparator is connected to the embedded DSP system. The time stamp counter is also externally connected to a pulse input module and a clock oscillator at the same time. Both the first Ethernet module and the second Ethernet module are provided with two paths of Ethernet interfaces. The man-machine interactive system, the embedded DSP system and a digital energy meter are in mutual communication and connection through the Ethernet. The SMV packet generator can be used in a digital energy meter communication protocol test, and the technical parameters of synchronization time delay, dispersion and sampling rate can be flexibly controlled.

The present application provides a method and apparatus for acquiring the performance of a program segment. The method includes: acquiring the cumulative running times of a preset program segment andacquiring the cumulative running time of the preset program segment according to a timestamp counter; Acquiring an average running time of the preset program segment according to the cumulative running time and the cumulative running times; Determining the performance of the preset program segment at the current run time according to the average run time. The method provided by the present application has good generality, is not affected by any CPU load, and can be applied across platforms. The problem of locating segments with performance flaws in complex programs is solved. Because the method adopted is not affected by the environment, it can be applied to the kernel state or the application state.