Abstract:
PROBLEM TO BE SOLVED: To provide a transmission interface device and method of transmission frequency automatic calibration.SOLUTION: A kind of transmission interface device and method of transmission frequency automatic calibration includes: a clock generation unit for generating a working clock for determining a transmission frequency; a data transmission unit connected to a host for transmitting a plurality of data to the host, or for receiving those data from the host by the working clock, therein the host or the data transmission unit detects the transmission error of those data, and performs error processing; and a control unit for generating an adjustment signal by the error processing, and for transmitting the adjustment signal to the clock generation unit to adjust the transmission frequency of the working clock. Thus, it is possible to determine whether or not the transmission frequency is within a range allowable by the host by the error processing, and to calibrate the transmission frequency on the basis of the error processing.
Abstract:
A data communication system comprises a transmitting device which transmits data and a receiving device which receives the data. The transmitting device comprises a clock generating circuit and a transmitting unit. The clock generating circuit generates a clock having a temperature characteristic in that a clock frequency varies with temperature. The transmitting unit transmits data generated in synchronization with the clock to the receiving device. The receiving device comprises a receiving unit, a detecting unit, a storage unit, and a calculating unit. The receiving unit receives the data. The detecting unit detects the clock frequency from the data. The storage unit stores temperature characteristic information regarding the temperature characteristic of the clock frequency. The calculating unit calculates a temperature corresponding to the clock frequency based on the clock frequency and the temperature characteristic information.
Abstract:
In a PCM modem system, a method and apparatus for optimizing the fractional sampling phase offset in the upstream direction to maximize the upstream data rate utilizes a probing signal from the analog modem generated during startup and having at least two distinct phases of a pure tone, with the probing signal being detected at the digital modem where an optimum sampling phase value is calculated. From this calculated value, a signal representing the appropriate amount to delay the input data stream is transmitted back to the analog modem for adjustment of the fractional sampling phase so that the fractional sampling phase offset at the central office quantizer is optimized.
Abstract:
PROBLEM TO BE SOLVED: To solve such a problem that an information processing apparatus for an external device controller etc., may fail to detect whether there is a delay with conventional constitution when data received from an external device are one or more cycles delayed behind an output clock of the external device controller. SOLUTION: When adjusting a data input timing of the external device controller, the information processing apparatus improves precision of calibration for adjusting the data input timing by gating or canceling the output clock of the external device controller on the basis of prescribed gating information. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a transmitting apparatus which facilitates the correct sampling of data by means of a clock in a receiving apparatus, and to propvide the receiving apparatus. SOLUTION: A data receiving unit 21 of a receiving apparatus 20 n receives from a data transmitting unit 11 of a transmitting apparatus 10 calibration data for detecting a data receiving state or a clock receiving state in the receiving apparatus 20 n . A decoder unit 24 sends from a transmitting unit 26 to the transmitting apparatus 10 calibration sample data obtained by sampling the calibration data by a sampler unit 23. A control unit 15 of the transmitting apparatus 10 detects the data receiving state or the clock receiving state in the receiving apparatus 20 n based on the calibration sample data received from the receiving apparatus 20 n and controls the data transmitting unit 11 and a clock transmitting unit 12 based on a result of the detection. COPYRIGHT: (C)2011,JPO&INPIT