Sequential circuits and MSI devices

1
Sequential circuits and MSI devices

• Dr. Konstantinos Tatas

2
Register

• A register is a sequential circuit that stores a
  word.
• It is composed of flip-flops (usually D-type)

3
Shift Register

• A register that shifts its contents in one
  direction
• Composed of D f/fs chained so that each Q output
  is connected to the next D input

4
Bidirectional Shift Register with Parallel Load

• Inputs
• Clock
• Reset
• 2 Control bits
• 00 no shift
• 01 shift right
• 10 shift left
• 11 parallel load
• Parallel load inputs
• Outputs
• Parallel output

5
Bidirectional Shift Register with Parallel Load
Circuit Diagram
6
Ring Counter