Communication device, communication method, program, and communication system

A first communication device configured to perform communication through a bus, comprising:

• a transmitting and receiving circuit configured to, under control of a second communication device, transmit and receive a signal to and from the second communication device,
• an error detection circuit configured to, when the transmitting and receiving circuit transmits and receives the signal, detect whether an error has occurred in the signal,
• wherein a sequentially-first word of a frame of the signal includes a broadcast command from the second communication device and a one-bit read/write indicator,
• in a case where the one-bit read/write indicator indicates data read after the second communication device starts communication, the error detection circuit detects that an error has occurred in the sequentially-first word,
• wherein the transmitting and receiving circuit and at least one third communication device are configured to receive the signal simultaneously,
• wherein the error detection circuit uses an error detection method in which a parity bit transmitted following a part of a sequentially-second word of the frame is used to perform a parity check on a bit stream, and
• wherein, in a case where the parity bit fails a parity check, the error detection circuit detects that an error has occurred in the sequentially-second word.

A communication method performed by a first communication device configured to perform communication through a bus, wherein the first communication device includes a transmitting and receiving circuit configured to transmit and receive a signal to and from at least two second communication devices simultaneously,

• the communication method comprising:
• transmitting and receiving the signal between the first communication device, which has a communication initiative through the bus, and a respective second communication device of the at least two second communication devices, which is configured to perform communication under control of the first communication device, wherein a sequentially-first word of a frame of the signal includes a broadcast command for notifying of simultaneous transmission of a command to the at least two second communication devices as a target and a one-bit read/write indicator;
• and
• in a case where the one-bit read/write indicator indicates data read after the first communication device starts communication, detecting by an error detection circuit of the respective second communication device that an error has occurred in the sequentially-first word,
• wherein the first communication device sets a parity bit transmitted following a part of a sequentially-second word of the frame, and
• wherein, in a case where the parity bit fails a parity check, the error detection circuit of the respective second communication device detects that an error has occurred in the sequentially-second word.

A communication system in which a plurality of communication devices perform communication through a bus,

• wherein the plurality of communication devices respectively include
• a transmitting and receiving circuit configured to transmit and receive a signal to and from at least one other communication device of the plurality of communication devices, and
• an error detection circuit configured to, when the transmitting and receiving circuit transmits and receives the signal, detect whether an error has occurred in the signal using an error detection method according to transmission and reception of the signal,
• wherein the signal is transmitted and received between a first communication device of the plurality of communication devices, which is configured to have a communication initiative through the bus, and at least two second communication devices of the plurality of communication devices, which receive the signal simultaneously and are respectively configured to perform communication under control of the first communication device,
• wherein a sequentially-first word of a frame of the signal includes a broadcast command for notifying of simultaneous transmission of a command to each of the at least two second communication devices as a target and a one-bit read/write indicator and, in a case where the one-bit read/write indicator indicates data read after the first communication device starts communication, the error detection circuit of a respective second communication device detects that an error has occurred in the sequentially-first word,
• wherein the first communication device sets a parity bit transmitted following a part of a second word of the frame,
• wherein, in a case where the parity bit fails a parity check, the error detection circuit of the respective second communication device detects that an error has occurred in the sequentially-second word.