A real-time clock device includes a resonator, a clock signal generation circuit, a time-counting circuit, a terminal, and a time-to-digital conversion circuit. The clock signal generation circuit outputs a time-counting clock signal based on an oscillation clock signal. The time-counting circuit generates time-counting data based on the time-counting clock signal. An external signal is input to the terminal. The time-to-digital conversion circuit measures a time difference between a transition timing of a first signal based on the external signal and a transition timing of a second signal based on the oscillation clock signal or the time-counting clock signal with a resolution higher than a time-counting resolution of the time-counting circuit, and obtains time difference information corresponding to the time difference.

A real-time clock device includes a resonator, a clock signal generation circuit, a time-counting circuit, a terminal, and a time-to-digital conversion circuit. The clock signal generation circuit outputs a time-counting clock signal based on an oscillation clock signal. The time-counting circuit generates time-counting data based on the time-counting clock signal. An external signal is input to the terminal. The time-to-digital conversion circuit measures a time difference between a transition timing of a first signal based on the external signal and a transition timing of a second signal based on the oscillation clock signal or the time-counting clock signal with a resolution higher than a time-counting resolution of the time-counting circuit, and obtains time difference information corresponding to the time difference.

Enhanced resolution for a real-time clock is implemented, which includes a real-time clock configured to operate at a first time resolution, at least one processing unit configured to operate at a second time resolution, wherein the second time resolution has a higher frequency than the first time resolution, a memory for storing data at a location including data from the real-time clock and the at least one processing unit, an interrupt configured to load information into the memory at the location using the at least one processing unit, the interrupt further configured to operate at a frequency associated with the second time resolution, a timing service configured to read information from the memory at the location, the timing service configured to operate at the second time resolution, and a calibration module configured to re-calibrate the real-time clock.

Enhanced resolution for a real-time clock is implemented, which includes a real-time clock configured to operate at a first time resolution, at least one processing unit configured to operate at a second time resolution, wherein the second time resolution has a higher frequency than the first time resolution, a memory for storing data at a location including data from the real-time clock and the at least one processing unit, an interrupt configured to load information into the memory at the location using the at least one processing unit, the interrupt further configured to operate at a frequency associated with the second time resolution, a timing service configured to read information from the memory at the location, the timing service configured to operate at the second time resolution, and a calibration module configured to re-calibrate the real-time clock.

Aspects of the embodiments are directed to systems, methods, and computer program products that facilitate a downstream port to operate in Separate Reference Clocks with Independent Spread Spectrum Clocking (SSC) (SRIS) mode. The system can determine that the downstream port supports one or more SRIS selection mechanisms; determine a system clock configuration from the downstream port to a corresponding upstream port connected to the downstream port by the PCIe-compliant link; set an SRIS mode in the downstream port; and transmit data across the link from the downstream port using the determined system clock configuration.

Aspects of the embodiments are directed to systems, methods, and computer program products that facilitate a downstream port to operate in Separate Reference Clocks with Independent Spread Spectrum Clocking (SSC) (SRIS) mode. The system can determine that the downstream port supports one or more SRIS selection mechanisms; determine a system clock configuration from the downstream port to a corresponding upstream port connected to the downstream port by the PCIe-compliant link; set an SRIS mode in the downstream port; and transmit data across the link from the downstream port using the determined system clock configuration.

A system for updating vehicle time information includes a communication device configured to wirelessly communicate with a wireless network using a network communication protocol. The system also includes a processing unit configured to assess communications between the vehicle to determine whether a condition related to a potential local time offset error exists, and based on determining that the condition exists, transmit a message supported by the communication protocol to the wireless network. The message is configured to prompt the wireless network to return a response message including a local time offset. The process is also configured to update a vehicle local time record based on the local time offset.

A system for updating vehicle time information includes a communication device configured to wirelessly communicate with a wireless network using a network communication protocol. The system also includes a processing unit configured to assess communications between the vehicle to determine whether a condition related to a potential local time offset error exists, and based on determining that the condition exists, transmit a message supported by the communication protocol to the wireless network. The message is configured to prompt the wireless network to return a response message including a local time offset. The process is also configured to update a vehicle local time record based on the local time offset.

This application discloses a clock synchronization method and a related apparatus in a distributed system. The distributed system includes a plurality of nodes, and the plurality of nodes include a master node and a plurality of slave nodes. The master node obtains a plurality of local clock offsets, where each of the plurality of local clock offsets indicates a clock offset between two nodes in the distributed system. The master node determines a global clock offset of a target slave node relative to the master node based on the plurality of local clock offsets, and sends the global clock offset to the target slave node. The target slave node obtains a clock reference value of a local clock, and then performs clock synchronization based on the clock reference value and the global clock offset.

The reservation management system includes an input device and a reservation management unit. The input device includes a manual operation part movable between a first position and a second position and sends a wireless signal containing movement information of the manual operation part and ID information. The reservation management unit performs reservation management based on the wireless signal sent from the input device. The reservation management unit includes a clock unit, a storage unit, and a determination unit. The clock unit measures time. The storage unit associates reservation information containing a reservation start time, and the ID information with each other and stores them. The determination unit determines a reservation performance status based on a current time, the reservation start time, and the movement information.