Usually two or more basic units are used for replications. In DSP processor. cpu and at-least one arithmetic elements are used for replications. In many processors the concept of parallel processing is used. In C67XX processor, at a time 8 instructions are fetched. This is called as fetch packet and it contains 8 packet and it contains 8 packets (256 bits) Every instruction contain P bit and it decides whether instruction should be performed parallely or not.

Every instruction contain 'P' bit and it decides whether instruction should be performed parallely or not. There are 3 types of P bit pattern.

1] Fully serial.

2] Fully parallel.

3] Partially serial.