| 摘要 |
PURPOSE:To omit the tester and thus to realize a big reduction of the testing cost by providing the means to test the function of the information on the same chip and simultaneously with installation of the information process system comprising the main memory and CPU onto one chip. CONSTITUTION:System LSI is formed by installing CPU1, main memory 2, test ROM3 and test auxiliary part 4 onto one sheet of the chip. Then test mode designation signal 6 is sent into part 4, and also test result display signal 7 is drawn out of part 4. Part 4 contains oscillator 11 to generate the clock signal which prescribes the action timing of CPU1, timer 14 to produce time window signal 12 and time- over signal 13, AND gates 15-18, delay line 19, flag 20 to deliver the result display signal, time constant circuit 21 and others in order to secure an independent test. Thus an LSI suited for the electronic computer, the electronic exchange and the like can be obtained. |
