Patent ID: 8199783

Claim:
A signal transmission device for transmitting a plurality of signals between a plurality of circuits operable according to given operation timing through a plurality of connection units which transmit digital data represented in binary, comprising: a transmission side storage unit connected to a transmission side circuit for holding each value of said plurality of signals transmitted at one-preceding operation timing, a reception side storage unit connected to a reception side circuit for holding each value of said plurality of signals received at said one-preceding operation timing, a determination unit for determining whether each value of said plurality of signals transmitted from said transmission side circuit at current operation timing is changed from a value held in said transmission side storage unit, a transmission unit for generating transmission information including first information represented in binary for discriminating a changed signal and second information represented in binary indicative of the end of change discrimination at current operation timing based on a determination result of said determination unit and transmitting the generated information to said plurality of connection units, a reception unit for receiving input of said first information through said plurality of connection units to discriminate a changed signal among said plurality of signals, a change unit for changing a value corresponding to said changed signal which is held in said reception side storage unit to output the obtained value as a reception signal of current operation timing to said reception side circuit, and a timing control unit for receiving said second information to control said operation timing, wherein said timing control unit changes the number of cycles for a subsequent operation cycle upon said second information every time a change ends.