The transfer of new information into a register is referred to as loading the register. If all the
bits of the register are loaded simultaneously with a single clock pulse, we say that the loading
is done in parallel. A register with parallel load can be constructed with D flip-flops When the load input is 1, the I inputs are
transferred into the register on the next clock pulse. When the load input is 0, the circuit inputs
are inhibited and the D flip-flops are reloaded with their present value, thus maintaining the content of the register. The feedback connection in each Flip-flop is necessary when D type is used
because a D flip-flop does not have a “no-change” input condition. With each clock pulse, the D
input determines the next state of the output. To leave the output unchanged, it is necessary to
make the D input equal to the present Q output in each flip-flop.
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