If QDQCQBQA = 1011 initially, what are the contents of the shift register
below after the input sequence SI = 01 is applied? (Assume 2 clock pulses are
used.)
1 is CORRECT. When 1011 is shifted left two positions, the 10 is shifted out of the register (i.e. they are lost) and 11 occupied the two most significant positions in the shift register. Behind these SI = 01 is added to the least two significant positions. Result: QCQCQBQA = 1101.