| 摘要 |
PURPOSE:To make a trigger line unnecessary and to make a test in one slave unit rapid by transmitting only data to which the address of the slave unit to execute the test is added. CONSTITUTION:A shift register 2 is provided for the output of a test data generator 1, a setter 3 to output the address of the unit to execute the test is provided, a shift register 4 is provided on its output side and outputs of register 2 and 4 are supplied to an OR circuit 5. By the control of a control part 6, data by blocks of the output of the generator 1 are successively stored into the register 2, the data of the preceding block are sent and the address from the setter 3 is stored into the register 4 in the first half while the data of the next block are stored and block data are sent in the second half while the register 2 stores the data. Consequently, data D1-Dn to which an address Ad1 of the slave unit to execute the test is added are jointedly sent in block units from the output of the OR circuit 5. |
