Communication device, communication method, program, and communication system

Abstract

There is provided a communication device that performs communication through a bus, including: a transmitting and receiving unit configured to transmit and receive a signal to and from at least one other communication device; and an error detection unit configured to, when the transmitting and receiving unit transmits and receives the signal, detect whether an error has occurred in the signal using a specific error detection method according to transmission and reception of the signal. The signal is transmitted and received between a first communication device, which is the communication device having a communication initiative through the bus, and a second communication device, which is the communication device configured to perform communication under control of the first communication device.

What is claimed is: 
     
         1 . A slave communication device configured to perform communication through a bus, comprising:
 transmitting and receiving circuitry configured to transmit and receive a signal to and from a master communication device; and   error detection circuitry configured to detect whether an error has occurred in the signal,   wherein, after a transaction of transmitting a common command code, the error detection circuitry is configured to:
 determine whether a format of data received after the transaction of transmitting a common command code is different from a predefined format, and 
 in a case where the format of data received is different from the predefined format, determine that an error has occurred. 
   
     
     
         2 . The slave communication device according to  claim 1 , wherein the predefined format is specified by the common command code. 
     
     
         3 . The slave communication device according to  claim 1 , wherein the error detection circuitry is configured to determine that the error has occurred in a case where the format of data received indicates a read and the predefined format indicates a write. 
     
     
         4 . The slave communication device according to  claim 1 , wherein the error detection circuitry is configured to determine that the error has occurred in a case where the format of data received indicates a write and the predefined format indicates a read. 
     
     
         5 . The slave communication device according to  claim 1 , wherein, in a case where the error detection circuitry determines that the error has occurred, the slave communication device is configured to wait until a stop condition is detected. 
     
     
         6 . The slave communication device according to  claim 1 , wherein, in a case where the error detection circuitry determines that the error has occurred, the slave communication device is configured to wait until a repeated start condition is detected. 
     
     
         7 . The slave communication device according to  claim 1 , wherein the common command code indicates a directed read or a directed write format. 
     
     
         8 . A communication method performed by a slave communication device configured to perform communication through a bus, wherein the slave communication device includes transmitting and receiving circuitry configured to transmit and receive a signal to and from a master communication device, and error detection circuitry, the communication method comprising:
 transmitting and receiving the signal between the slave communication device and the master communication device; and   after a transaction of transmitting a common command code:
 determining whether a format of data received after the transaction of transmitting a common command code is different from a predefined format, and 
 in a case where the format of data received is different from the predefined format, determining that an error has occurred. 
   
     
     
         9 . The communication method according to  claim 8 , wherein the predefined format is specified by the common command code. 
     
     
         10 . The communication method according to  claim 8 , comprising determining that the error has occurred in a case where the format of data received indicates a read and the predefined format indicates a write. 
     
     
         11 . The communication method according to  claim 8 , comprising determining that the error has occurred in a case where the format of data received indicates a write and the predefined format indicates a read. 
     
     
         12 . The communication method according to  claim 8 , wherein, in a case it is determined that the error has occurred, waiting until a stop condition is detected. 
     
     
         13 . The communication method according to  claim 8 , wherein, in a case where it is determined that the error has occurred, waiting until a repeated start condition is detected. 
     
     
         14 . A communication system comprising:
 a master communication device configured to perform communication through a bus; and   a slave communication device configured to perform communication through the bus under control of the master communication device, the slave communication device including:
 transmitting and receiving circuitry configured to transmit and receive a signal to and from a master communication device, and 
 error detection circuitry configured to detect whether an error has occurred in the signal, 
   wherein, after a transaction of transmitting a common command code, the error detection circuitry is configured to:
 determine whether a format of data received after the transaction of transmitting a common command code is different from a predefined format, and 
 in a case where the format of data received is different from the predefined format, determine that an error has occurred. 
   
     
     
         15 . The communication system according to  claim 14 , wherein the predefined format is specified by the common command code. 
     
     
         16 . The communication system according to  claim 14 , wherein the error detection circuitry is configured to determine that the error has occurred in a case where the format of data received indicates a read and the predefined format indicates a write. 
     
     
         17 . The communication system according to  claim 14 , wherein the error detection circuitry is configured to determine that the error has occurred in a case where the format of data received indicates a write and the predefined format indicates a read. 
     
     
         18 . The communication system according to  claim 14 , wherein, in a case where the error detection circuitry determines that the error has occurred, the slave communication device is configured to wait until a stop condition is detected. 
     
     
         19 . The communication system according to  claim 14 , wherein, in a case where the error detection circuitry determines that the error has occurred, the slave communication device is configured to wait until a repeated start condition is detected. 
     
     
         20 . The communication system according to  claim 14 , wherein the common command code indicates a directed read or a directed write format.