4-bit Priority Encoder

Problem Description

Implement a 4-bit priority encoder that converts the highest priority active input bit to a binary code.

Module Interface

• Inputs:
  • in: 4-bit input data
• Outputs:
  • out: 2-bit encoded output
  • valid: 1-bit valid signal

Expected Behavior

• Priority (highest to lowest): in[3] > in[2] > in[1] > in[0]
• When in[3] = 1: out = 11, valid = 1
• When in[3] = 0 and in[2] = 1: out = 10, valid = 1
• When in[3:2] = 00 and in[1] = 1: out = 01, valid = 1
• When in[3:1] = 000 and in[0] = 1: out = 00, valid = 1
• When in = 0000: out = 00, valid = 0

Use if-else statements or casex to check priority. Start with the highest priority input.