| 摘要 |
PURPOSE:To complicate the decoding of transfer data even if they are monitored and to attain the secrecy of the data by connecting the 1st signal line up to the 2nd signal line through (n+1) registers connected in series. CONSTITUTION:In the initial state, required data are inputted from data buses DB0 to DBn to the registers S0 to Sn. When a control signal A is 'H', a transmission gate 50 is turned on, a signal line group 40 is turned to a conductive state and a transmission gate 70 is turned off, a signal line group 60 is turned to a non-conductive state. Thereby, the output of the register Si (i=0.1...n-1) is connected to the input of the register S(i+1) through the signal line 40Si and the output of the register Sn is connected to the input of the register S0 through the signal line 40Sn. When a signal line Bx out of Bm (m=0,1...n) is 'H' and all the other signal lines are 'L', only the transmission gate 90x out of plural gates 90 is opened and the output of the register Sx is connected to a signal line 80. |
