cpu_16bits

16 bits cpu using the vhdl, a hardware language description

Table of contents

Resources
Instructions
FSM
Observations
Tests

Resources

This cpu contain:

• Memory access
• Aritmetich operations
• 16 bits instruction (like MIPS)
• Stack Operations
• IO operations
• Control flux operations
• The new version includes a IO module as a RAM and a especific register for the stack operations, the SP (stack pointer)

Instructions

First version Second version, with the same as the first and more

• This processor has load, store and mov operations with immediate values and ram values
• Also has 11 operations with ALU
• Control flux of program with jmp operations
• IO Operations
• Stack operations

FSM

FSM transitions

Values of each fsm state

• This FSM represent each state of cpu instructions

• NOP state represent an state with make nothing

• HALT state represent an state with cpu "die"

Observations

• The ROM of this repository contain some sequence of instructions pre defined
• For testing your program, is recommended modify the values for varied sequence of instructions
• This processor is testing by the following sequence of instructions
  • MOV R0, 0x02
  • LDR R1, [R0]
  • MOV R0, 0x04
  • LDR R2, [R0]
  • ADD R1, R1, R2
  • MOV R0, 0X06
  • STR [R0], R1
  • HALT
• But, also sequence of valid instruction can run since the correct binary(oh hexadecimal) value be provided

Tests

• All components were tested individually with their respective testbenches and their integrations were tested on the CPU testbench

• Below, some more relevant tests are exemplified

CPU: FSM: ALU: