The shift register of Fig. 4-27 has a maximum capacity of 6 bytes. Could a cheaper version of the IFU be built with a 5-byte shifter register? How about a 4-byte one? Having examined cheaper IFUs in...

The shift register of Fig. 4-27 has a maximum capacity of 6 bytes. Could a cheaper version of the IFU be built with a 5-byte shifter register? How about a 4-byte one? Having examined cheaper IFUs in the previous question, now let us examine more expensive ones. Would there ever be any point to have a much larger shift register in it, say 12 bytes? Why or why not?