Question

Use MIPS memory-mapped I/O to interact with a user. Each time the user presses a button, a pattern of your choice displays on five light-emitting diodes (LEDs). Suppose the input button is mapped to address 0xFFFFFF10 and the LEDs are mapped to address 0xFFFFFF14. When the button is pushed, its output is 1; otherwise, it is 0.

(a) Write MIPS code to implement this functionality.

(b) Draw a schematic for this memory-mapped I/O system.

(c) Write HDL code to implement the address decoder for your memory-mapped I/O system.

Answer 1

`include "regr.v"
`include "im.v"
`include "regm.v"
`include "control.v"
`include "alu.v"
`include "alu_control.v"
`include "dm.v"

`ifndef DEBUG_CPU_STAGES
`define DEBUG_CPU_STAGES zero
`endif

module cpu(
       input wire clk);

   parameter NMEM = 20; // variety in instruction memory
   parameter IM_DATA = "im_data.txt";

   //