JP2009141744A5 - - Google Patents

Claims (8)

A communication apparatus for use in a communication system that sends and receives data to be encoded frame structure between the communication devices,
The receiving circuit in the communication device is:
A detection circuit that sets a plurality of detection points at a frequency multiplied by a clock in the reception circuit , detects a change in reception data for each detection point continuously during frame reception, and
For each of the plurality of detection points , a counting circuit that counts the number of changes in received data;
A selection circuit that selects any of the detection points as a sampling point based on the information aggregated by the aggregation circuit ;
A sampling circuit that samples received data at the sampling point selected by the selection circuit;
Decodes the received data detected by the sampling circuit, possess a circuit for taking as the received data, and
Correction of sampling points during frame reception by detecting changes in received data for each detection point, summing up the number of changes in received data for each detection point, and selecting the sampling points over the entire period during frame reception. A communication device characterized by continuously performing The communication device according to claim 1.
The selection circuit is a sub pump ring point, the communication device and selects the reverse phase of the most change a large number of times sampling point. A communication device used in a communication system for transmitting and receiving a frame-structured signal encoded by the FM0 method between communication devices via two wires,
The communication device includes a transmission circuit and a reception circuit,
The receiving circuit in the communication device is:
A plurality of detection points are set at a frequency multiplied by the clock in the receiving circuit, and the signal level changes continuously for each detection point while receiving the signal of the frame configuration transmitted from the transmission circuit of the counterpart communication device. A detection circuit for detecting
For each of the plurality of detection points, a counting circuit that counts the number of changes in the signal level;
A selection circuit that selects one of the detection points as a sampling point based on the information aggregated by the aggregation circuit;
A sampling circuit that samples received data at a sampling point selected by the selection circuit;
A circuit that decodes the received data detected by the sampling circuit and captures the received data as received data,
By detecting the change in signal level at each detection point, summing up the number of changes in signal level at each detection point, and selecting the sampling point over the entire period during frame reception, sampling the received frame during frame reception. A communication apparatus characterized by continuously correcting points. 4. The communication apparatus according to claim 3, wherein the selection circuit selects a detection point that is opposite in phase to the detection point determined to have the largest number of signal level changes. The frame includes a preamble field, a field indicating a frame start, a data field, and a field indicating a frame end. Detection of a change in signal level at each detection point, totalization of the number of signal level changes at each detection point, and 5. The communication apparatus according to claim 3, wherein the sampling point selection for the received frame is continuously performed by executing the selection of the sampling point in the entire frame including the data field. A semiconductor device incorporated in a communication device to send and receive signals encoded frame structure,
The receiving circuit formed on the semiconductor device is
Means for setting a plurality of detection points at a frequency multiplied by a clock in the receiving circuit;
Relative to the frame, a detection circuit for detecting a signal level of a received frame in the plurality of detection points respectively,
A counting circuit that counts the number of signal level changes detected at each of the detection points ;
A selection circuit that selects any of the detection points as a sampling point based on the information aggregated by the aggregation circuit ;
A sampling circuit that samples received data at a sampling point selected by the selection circuit;
A circuit that decodes the received data detected by the sampling circuit and captures the received data as received data,
In the communication device in which the semiconductor device is incorporated, the receiving circuit is
The detection of the signal level of the received frame at each of the plurality of detection points, the aggregation of the number of changes in the signal level detected at each of the detection points, the correction of the sampling point based on the aggregated information, and the correction A semiconductor device configured to continuously perform sampling for a received frame at a sampling point in all periods during frame reception . The semiconductor device according to claim 6 .
The selection circuit is a semiconductor device characterized by selecting a detection point in opposite phase detection point number of changes in the signal level is determined to be highest in the sampling points. The frame includes a preamble field, a field indicating a frame start, a data field, and a field indicating a frame end. Detection of a change in signal level at each detection point, totalization of the number of signal level changes at each detection point, and 8. The semiconductor device according to claim 6, wherein the sampling point selection for the received frame is continuously performed by executing the selection of the sampling point in the entire frame period including the data field.