Communication apparatus, communication method, program, and communication system

A communication method comprising the steps of:

• sending, via a data signal line for transmitting serial data and a clock signal line for transmitting a serial clock, on a word basis in which data of predetermined byte count per one word id included, the data to another communication apparatus;
• and
• confirming the data sent to the another communication apparatus so as to include notification information necessary for recognizing presence or absence of a word having invalid data into a signal to be transferred to the another communication apparatus, wherein
• a data length of valid data of the entire data is sent as the notification information at the time of write transfer in a DDR (Double Data Rate) mode of a plurality of modes specified by an HDR (High Data Rate) mode for transferring data of two bytes per one word.

A program for having a computer execute processing of:

• sending, via a data signal line for transmitting serial data and a clock signal line for transmitting a serial clock, on a word basis in which data of predetermined byte count per one word is included, the data to another communication apparatus;
• and
• confirming the data sent to the another communication apparatus so as to include notification information necessary for recognizing presence or absence of a word having invalid data into a signal to be transferred to the another communication apparatus, wherein
• a data length of valid data of the entire data is sent as the notification information at the time of write transfer in a DDR (Double Data Rate) mode of a plurality of modes specified by an HDR (High Data Rate) mode for transferring data of two bytes per one word.

A communication apparatus comprising:

• a receiving section configured to receive data from another communication apparatus via a data signal line for transmitting serial data and a clock signal line for transmitting a serial clock on a word basis in which data of a predetermined byte count per one word is included;
• and
• a recognition section configured to, if, in accordance with notification information necessary for recognizing presence or absence of a word having invalid data, the notification information being included in a signal transferred from the another communication apparatus, the receiving section recognizes that the received word has invalid data, avoid an execution of processing based on the invalid data, wherein
• the receiving section receives a data length of valid data of the entire data as the notification information at the time of write transfer in a DDR (Double Data Rate) mode in a plurality of modes specified by an HDR (High Data Rate) mode for transferring data of two bytes per one word.

A communication method comprising the steps of:

• receiving data from another communication apparatus via a data signal line for transmitting serial data and a clock signal line for transmitting a serial clock on a word basis in which data of a predetermined byte count per one word is included;
• and
• if, in accordance with notification information necessary for recognizing presence or absence of a word having invalid data, the notification information being included in a signal transferred from the another communication apparatus, the receiving section recognizes that the received word has invalid data, avoiding an execution of processing based on the invalid data, wherein
• a data length of valid data of the entire data is received as the notification information at the time of write transfer in a DDR (Double Data Rate) mode in a plurality of modes specified by an HDR (High Data Rate) mode for transferring data of two bytes per one word.

A program for having a computer execute processing of:

• receiving data from another communication apparatus via a data signal line for transmitting serial data and a clock signal line for transmitting a serial clock on a word basis in which data of a predetermined byte count per one word is included;
• and
• if, in accordance with notification information necessary for recognizing presence or absence of a word having invalid data, the notification information being included in a signal transferred from the another communication apparatus, the receiving section recognizes that the received word has invalid data, avoiding an execution of processing based on the invalid data, wherein
• a data length of valid data of the entire data is received as the notification information at the time of write transfer in a DDR (Double Data Rate) mode in a plurality of modes specified by an HDR (High Data Rate) mode for transferring data of two bytes ver one word.

A communication system comprising:

• a communication apparatus on a sending side having
• a sending section configured to send, via a data signal line for transmitting serial data and a clock signal line for transmitting a serial clock, on a word basis in which data of predetermined byte count per one word is included, the data to a communication apparatus on a receiving side, and
• a confirmation section configured to confirm the data sent to the communication apparatus on the receiving side so as to include notification information necessary for recognizing presence or absence of a word having invalid data into a signal to be transferred to the communication apparatus on the receiving side;
• and
• a communication apparatus on the receiving side having
• a receiving section configured to receive the data from the communication apparatus on the sending side, and
• a recognition section configured to, if, in accordance with the notification information being included in a signal transferred from the communication apparatus on the sending side, the receiving section recognizes that the received word has invalid data, avoid an execution of processing based on the invalid data, wherein
• a data length of valid data of the entire data is sent and received as the notification information at the time of write transfer in a DDR (Double Data Rate) mode in a plurality of modes specified by an HDR (High Data Rate) mode for transferring data of two bytes per one word.