Shift Registers

Q1: A bidirectional 4-bit shift register is storing the nibble 1110. Its  input is LOW. The nibble 0111 is waiting to be entered on the serial data-input line. After two clock pulses, the shift register is storing ________.

A 1001

B 0111

C 1000

D 1110

ANS:D - 1001

Stored nibble : waitin nibble.

Initially 1110 : 0111.

1st pulse 1100 : 111.

2nd pulse 1001 : 11.

The final answer after 2nd clk pulse is 1001.

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