15_Program_Counter.md

Program Counter

Contents

• Inputs
• Outputs
• Functionality
  • Registers
  • Clk
  • Active low reset

Inputs

Name	Bits wide
clk	1-bit
rstn	1-bit
npc	32-bits
pc_en	1-bit

Outputs

Name	Bits wide
pc	32-bits

Functionality

Registers

• 32-bit pc register

On posedge clk

• pc

  State	Output
  pc_en == 0	pc stays the same
  pc_en == 1	pc = npc

Asynchronous active low reset

• pc value resets to 0