Patent ID: 9651609
Date: 2017-05-16
CPC Classifications: G01R,G11C

Claim:
1. A semiconductor circuit having a test function, comprising: a first circuit block including a circuit for performing a main function of the semiconductor circuit; a first power control block for controlling supply of power to the first circuit block; a second circuit block including a circuit for performing a function of testing the semiconductor circuit; and a second power control block for controlling supply of power to the second circuit block, wherein the semiconductor circuit is operable in a first power mode in which a first pad is supplied with a supply voltage and a second pad is grounded, or in a second power mode in which the second pad is supplied with the supply voltage and the first pad is grounded; wherein the second power control block is implemented as a diode, the second circuit block and the diode being connected in series between the first pad and the second pad; wherein the first circuit block is normally operated in the first power mode; and wherein the semiconductor circuit is configured such that, in the first power mode, the diode is reversely biased, thus interrupting supply of power to the second circuit block.