| Chronologic Pty. Ltd. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120131374 | JITTER REDUCTION METHOD AND APPARATUS FOR DISTRIBUTED SYNCHRONISED CLOCK ARCHITECTURE - A method of reducing jitter in a local clock of a synchronised USB device attached to a USB Hub, the USB Hub having a local clock and repeater circuitry, comprising: observing a USB data stream with the USB Hub, the data stream having a data stream bit rate; the USB Hub decoding a periodic signal structure in the USB data stream; the USB Hub generating an event signal in response to decoding of the periodic signal structure; and the USB Hub locking a frequency of the local clock of the USB Hub to the periodic event signal. The local clock of the USB Hub is adapted to be a clocking source for the repeater circuitry of the USB Hub at substantially an integer multiple of a frequency of the data stream bit rate. | 05-24-2012 |
| 20120066537 | COMPOUND UNIVERSAL SERIAL BUS ARCHITECTURE PROVIDING PRECISION SYNCHRONISATION TO AN EXTERNAL TIMEBASE - A method of synchronising a compound Super Speed USB device, comprising: providing data communication between a host computing device and the compound Super Speed USB device across the Super Speed USB communication channel; establishing a Super Speed USB communication channel to a Super Speed USB function of the compound USB device; establishing a non-Super Speed synchronisation channel to a non-Super Speed USB function of the compound USB device; and synchronising a local clock of the compound USB device to a periodic data structure within a data stream in the non-Super Speed synchronisation channel so that the local clock can enable synchronous operation of the compound USB device with one or more comparable USB devices. | 03-15-2012 |
| 20120066418 | SYNCHRONOUS NETWORK OF SUPERSPEED AND NON-SUPERSPEED USB DEVICES - A method of synchronising the operation of a plurality of SuperSpeed USB devices and a plurality of non-SuperSpeed USB devices is provided. The method includes establishing a SuperSpeed synchronisation channel for each of the plurality of SuperSpeed USB devices; establishing a non-SuperSpeed synchronisation channel for each of the plurality of non-SuperSpeed USB devices; synchronising a respective local clock of each of the plurality of SuperSpeed USB devices; synchronising a respective local clock of each of the plurality of non-SuperSpeed USB devices; and synchronising the SuperSpeed and non-SuperSpeed synchronisation channels so that the SuperSpeed and non-SuperSpeed devices can operate in synchrony. | 03-15-2012 |
| 20120066417 | SYNCHRONISATION AND TRIGGER DISTRIBUTION ACROSS INSTRUMENTATION NETWORKS - A system for synchronising the operation of a measurement instrument having a microcontroller, a local oscillator and function circuitry to an external timebase is provided. The system includes a USB Host Controller; an interrupt generator adapted to respond to ITPs by generating respective interrupts and passing the interrupts to the microcontroller; and a timer for measuring an interval between receptions of the ITPs in a time domain of the local oscillator. | 03-15-2012 |
| 20120060045 | METHOD AND APPARATUS FOR SYNCHRONISING THE LOCAL TIME OF A PLURALITY OF INSTRUMENTS - A method of determining the downstream propagation time of signals from a USB Host Controller across one or more USB cables and one or more USB Hubs to a SuperSpeed USB device, including locking a clock of the SuperSpeed USB device to information that includes a first timestamp, transmitting a plurality of signals to the USB Host Controller, each of the signals containing a second timestamp indicative of a local time of the SuperSpeed USB device when the respective signal was generated by the SuperSpeed device; the USB Host Controller creating a third timestamp indicative of a time of reception from the SuperSpeed USB device; determining a time period from one or more respective time differences between corresponding second and third timestamps, the time period being indicative of a sum of a downstream propagation time and an upstream propagation time; and determining the downstream propagation time from the time period. | 03-08-2012 |
| 20120059965 | PRECISION SYNCHRONISATION ARCHITECTURE FOR SUPERSPEED UNIVERSAL SERIAL BUS DEVICES - A method of providing a synchronisation channel to a SuperSpeed USB device is provided. The method including a SuperSpeed communication channel connection to the SuperSpeed USB device with a USB cable that has USB 2.0 D+ and D− data signalling lines disabled or disconnected at an upstream connection point; multiplexing synchronization information onto the D+/D− data signalling lines at the upstream connection point; and demultiplexing the synchronization information from the D+/D− signalling lines at a downstream connection point of the cable; whereby the synchronisation channel is maintained across the D+/D− data signalling lines. | 03-08-2012 |
| 20120059964 | HIGH DENSITY, LOW JITTER, SYNCHRONOUS USB EXPANSION - A method of providing high density expansion of a USB network, the method comprising: attaching a plurality of USB hubs to adjacent slots in a PXI instrumentation chassis; configuring one of the USB hubs as a primary USB Hub; connecting an upstream port of the primary USB Hub to a USB network; configuring a first downstream port of the primary USB Hub to communicate across a first PXI Local Bus to a first adjacent USB Hub of the USB Hubs other than the primary USB Hub, the first adjacent USB Hub being adjacent to the primary USB Hub; configuring a plurality of other downstream ports of the primary USB Hub to provide expansion of the primary USB Hub; connecting an upstream port of the first adjacent USB Hub to the first PXI Local Bus, wherein the first PXI Local Bus is in the direction of the primary USB Hub; configuring a first downstream port of the first adjacent USB Hub to communicate across a second PXI Local Bus to a second adjacent USB Hub of the USB Hubs other than the primary USB Hub, the second adjacent USB Hub being adjacent to the first adjacent USB Hub; configuring a plurality of other downstream ports of the first adjacent USB Hub to provide expansion of the first adjacent USB Hub; and configuring any other of the USB hubs and the first adjacent USB Hub in like manner. | 03-08-2012 |
| 20100058097 | USB BASED SYNCHRONIZATION AND TIMING SYSTEM - A synchronization apparatus, comprising: a USB device having a USB microcontroller, circuitry for observing USB traffic, and circuitry for decoding from a USB data stream a periodic data structure (such as a clock carrier signal) containing information about a distributed clock frequency and phase and outputting a decoded carrier signal; and circuitry for receiving the decoded carrier signal, for generating a software interrupt upon receipt of a predefined data packet (such as a SOF packet) and for passing the software interrupt to the USB microcontroller; wherein the USB microcontroller is configured to respond to the software interrupt (such as with an interrupt service routine provided therein) by generating an output signal adapted to be used as a synchronization reference signal. | 03-04-2010 |
