The Data Switch Problem:

• Two sources of bits: Circuit A and Circuit B

• Two destinations for bits: Circuit C and Circuit D

• We want to route sources to destinations, and potentially change the routing every clock cycle.

• We use multiplexers to do the switching.

• Four control lines (Rd, Rc, LDc, LDd) control the data switch.

• Seems complicated. We can gain insight by solving a simpler problem first ...