Pertemuan:12 (Register)

11/02/2013 02:25:00 PM (Basic) Digital Technique 0 Comments

In this section, the discusion is about :

Register
Shift Registers



Register:
• Clocked sequential circuit
– No flip-flops → reduce to combinational circuit
– No combinational circuit → remain a sequential circuit

• Register: a group of flip-flops capable of storing one bit of information – n-bit register consists of a group of n flip-flops capable of storing n bits

Parallel load
• loading: the transfer of new information into a register
• parallel loading: all the bits of the register are loaded simultaneously with a common clock pulse – Load control

Approaches to register with parallel load
• controlling the clock input signal with an enabling gate: uneven propagation delays between the master clock and the inputs of flip-flops
• controlling the D inputs: ensure that all clock pulses arrive at the same time anywhere in the system

Shift Register:
Shift register: a register capable of shifting its binary information in one or both directions

• Example Fig. 6-3: each clock pulse shifts the contents of the register one bit position to the right
– serial input: determines what goes into the leftmost flip-flop
– serial output: taken from the output of the rightmost flip-flop

• Shift control: make the shift occur only with certain pulses
– inhibiting the clock
– control through the D inputs (shown later)



You can download full chapter from this link:
BDT12-Register