Decoders and multiplexors

• Encode n single-bit device ports using log n bits of a controller port

  • enabled decoder: one-hot, input-only device ports
  • registered decoder: input-only (but not one-hot) device ports
  • multiplexor: output-only device ports

n one-hot signals

log(n)

bits

enable

µC

enabled decoder

n signals

µC

log(n)

bits

enable

D

Q

EN

n register

select lines

registered decoder

µC

log(n)

select bits

n signals

data

multiplexor

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