Actually, most practical digital circuit design problems are too large to be solved by minimisation and Karnaugh maps. We also have short hand notations for registers.
Registers can contain either data or contro l bits.
The source register may be selected by a Multiplexer circuit. The structure of the Register Transfer Circuit has to be changed because now all registers receive the same input. . . So far, by using a multiplexer, we have been able to select the source register whose contents are fed back to the inputs of all the registers. In order to complete the transfer, a clock pulse must be applied to the destination register. No clock pulse should be applied to any of the other registers.