23 February, 2000

The quiz

• still -- Wednesday, 1 March

Decoders

• sometimes called demultiplexers or demux
• typical configuration include
  • m data inputs
  • 2^m data outputs
  • 1 enable input
• typical chips include
  • 3-to8 decoder

Selectors

• sometimes called multiplexers or MUX
• typical configuration include
  • 2^m data inputs
  • m selector outputs
  • 1 data input
  • But may be grouped
• typical chips include
  • Dual 4-to-1 selector

Priority encoders

• typical configuration include
  • 2^m data inputs
  • m data outputs
• typical chips include
  • 8-to-3 priority encoder

Magnitude Comparators

• typical configuration include
  • 2 sets of m data inputs
  • 1 to 3 data outputs
• typical chips include
  • 4-bit magnitude comparator

Shifters

• typical configuration include
  • m & carry data inputs
  • function selector inputs
  • m & carry data outputs
• types of shifts
  • right vs. left
  • logical vs. arithmetic
• typical chips include
  • 4-bit shifter

Buses

• tristate (or 3-state) driver
  • 0
  • 1
  • Z -- high impedance
• typical configuration include
  • m data inputs
  • one control input
  • m data outputs
• typical chips include
  • Quad buffer with 3-STATE outputs