Information processing system

An information processing system comprising:

• a first bus;
• a first module coupled to said first bus;
• a second bus;
• a second module coupled to said second bus;
• a data transfer unit coupled to said first bus and said second bus, wherein said data transfer unit operates in a plurality of data transfer modes, including:
• a first mode which inputs data from said first bus in accordance with a first protocol, and then outputs said data inputted from said first bus to said second bus in accordance with a second protocol, and
• a second mode which inputs data from said first bus in accordance with said first protocol, processes said data inputted from said first bus, and then outputs processed data to said second bus in accordance with said second protocol.

An information processing system comprising:

• a first bus;
• a first module coupled to said first bus;
• a second bus;
• a second module coupled to said second bus;
• a data transfer unit coupled to said first bus and said second bus, wherein said data transfer unit includes an operation processor which processes data transferred between said first bus and said second bus, wherein said operation processor comprises:
• a data register arranged to register data from one of said first bus and said second bus;
• a first storage unit arranged to store data registered from said data register for a data processing operation;
• an arithmetic logic unit (ALU) arranged to perform said data processing operation and to produce processed data;
• a second storage unit arranged to store the processed data after said data processing operation;
• a transfer rate control unit arranged to control the transfer of data between said first bus and said second bus;
• and
• an operation mode control unit arranged to control said data processing operation in accordance with a designation from at least the module connected on one of said first bus and said second bus.

An information processing system comprising:

• a first bus;
• a first module coupled to said first bus;
• a second bus;
• a second module coupled to said second bus;
• a data transfer unit coupled to said first bus and said second bus, to control the transfer of data between said first bus and said second bus, wherein said data transfer unit operates in a plurality of data transfer modes, including:
• a first mode in which data is received from said first bus in accordance with a first protocol, and then transferred to said second bus in accordance with a second protocol;
• and
• a second mode in which data is received from said first bus in accordance with said first protocol, processed and then processed data is transferred to said second bus in accordance with said second protocol.