8_1.2
The Data Switch Problem:
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Two sources of bits: Circuit A and Circuit B
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Two destinations for bits: Circuit C and Circuit D
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We want to route sources to destinations, and potentially
change the routing every clock cycle.
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We use multiplexers to do the switching.
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Four control lines (Rd, Rc, LDc, LDd) control the data
switch.
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Seems complicated. We can gain insight by solving a simpler
problem first ...