| 摘要 |
PURPOSE:To decode a function signal by a LSI function discriminator from the terminal of LSI, by obtaining the function signal, specified by a function incorporated in LSI, from a discrimination information memory unit, pulse converter, oscillator, etc. CONSTITUTION:A fixed voltage is applied between power terminals 8 and 8a. At this time, oscillator 4 generates periodic pulses, which are supplied to pulse converter 5. Discrimination information memory unit 3, on the other hand, supplies pulse converter 5 continuously with discrimination information on a function equivalent to that of the logic circuit of LSI1. Synchronizing with periodic pulses from oscillator 4, pulse converter 5 provides series-parallel conversion of discrimination information and then transfers pulse signals P1 and P2 to dedicated terminal 6 in series. Pulse signals arriving at dedicated terminal 6 are supplied to function discriminator 9 for LSI. Function discriminator 9 decodes discrimination information pulse-string signal P2 and displays it. |
