There is a method of writing to memory registers using something called a shift register, where data is fed into each flip flop one bit at a time. The bits are shifted into the next flip-flop as the data is fed into the register. Here is an example where we are writing the bits 0110 into a 4-bit memory. The least significant bit is first fed into the leftmost flip-flop, and it is shifted through until all of the data is read into the register.

Design and draw a circuit for a 4-bit shift register comprised of D flip-flops.

0110 011 0 01 1 0 0