What are the contents of the shift register shown below (assumed initially
cleared) after the input sequence SI = 101111 is applied? (Assume 6 clock pulses
are used).
3 is CORRECT. Since more than 4 bits of SI data was shifted in, the contents of the shift register is necessarily equal to the value of the 4 most recent bits of SI data shifted in: i.e. SI = 1111. [But see question #8 below.]