Patent ID: 6463006
Filing Date: 2002-10-08
Classification: G11C

Abstract:
A semiconductor integrated circuit having a normal operation mode and a test mode, said semiconductor integrated circuit comprising:(a) a functional circuit for providing a two-valued logic signal which varies at a predetermined variation frequency; (b) a converting circuit for converting said two-valued logic signal supplied from said functional circuit into a multiple-valued logic signal which varies at a less variation frequency than that of said two-valued logic signal; and (c) an output selecting circuit for selecting between said two-valued logic signal and said multiple-valued logic signal; wherein when said semiconductor integrated circuit is in said normal operation mode, said output selecting circuit selects said two-valued logic signal as a signal to be provided from said semiconductor integrated circuit; and wherein when said semiconductor integrated circuit is in said test mode, said output selecting circuit selects said multiple-valued signal as a signal to be provided from said semiconductor integrated circuit.