1 files changed, 90 insertions, 0 deletions
diff --git a/lab7bonus_top.sv b/lab7bonus_top.sv
new file mode 100644
index 0000000..d76cf7c
--- /dev/null
+++ b/lab7bonus_top.sv
@@ -0,0 +1,90 @@
+`define MNONE 2'b00
+`define MREAD 2'b01
+`define MWRITE 2'b10
+
+module lab7bonus_top(KEY,SW,LEDR,HEX0,HEX1,HEX2,HEX3,HEX4,HEX5);
+    input [3:0] KEY;
+    input [9:0] SW;
+    output reg [9:0] LEDR;
+    output [6:0] HEX0, HEX1, HEX2, HEX3, HEX4, HEX5;
+
+    reg [8:0] mem_addr;
+    reg [7:0] read_address, write_address, next_LEDR, onto_LEDR;
+    reg write, enable;
+    reg [15:0] dout, din, read_data, write_data, ir;
+    wire [1:0] mem_cmd;
+    reg msel;
+    wire N, V, Z;
+
+
+    RAM MEM(.clk (~KEY[0]),
+            .read_address (read_address),
+            .write_address (write_address),
+            .write (write),
+            .din (din),
+            .dout (dout)
+            );
+
+    cpu CPU(.clk (~KEY[0]),
+            .reset (~KEY[1]),
+            .read_data (read_data),
+            .write_data(write_data),
+            .mem_addr(mem_addr),
+            .mem_cmd(mem_cmd),
+            .N(N),
+            .V(V),
+            .Z(Z)
+            );
+
+
+    always_comb begin
+
+      msel = mem_addr[8]; //checks the last bit to check the indicated address. 0 would mean below 255 and 1 would mean abouve 256
+      write  =  ({mem_cmd, msel} == {`MWRITE, 1'b0}); //write choosing
+      enable = ({mem_cmd, msel} == {`MREAD, 1'b0}); //the and gates and stuff
+
+      write_address = mem_addr[7:0];
+      read_address = mem_addr[7:0];
+      din = write_data;
+
+      read_data = enable ? dout : {16{1'bz}}; //tri-state driver
+
+      if ({mem_addr, mem_cmd} == {9'h140, `MREAD}) read_data = {8'b0, SW[7:0]}; //desing own logic this reads the switches if mem_cmd and addr are according
+      else read_data = read_data;
+
+      if ({mem_addr, mem_cmd} == {9'h100, `MWRITE}) next_LEDR = write_data[7:0]; //design own logic this writes to the switches if mem_cmd and addr are according
+      else next_LEDR = 8'bx;;
+
+    end 
+
+    always_ff @(posedge ~KEY[0]) begin
+      LEDR[7:0] = next_LEDR;
+    end
+    
+endmodule
+
+
+// Ram block obtained form slide set 11
+module RAM(clk,read_address,write_address,write,din,dout);
+  parameter data_width = 16; 
+  parameter addr_width = 8;
+  parameter filename = "data.txt";
+
+  input clk;
+  input [addr_width-1:0] read_address, write_address;
+  input write;
+  input [data_width-1:0] din;
+  output [data_width-1:0] dout;
+  reg [data_width-1:0] dout;
+
+  reg [data_width-1:0] mem [2**addr_width-1:0];
+
+  initial $readmemb(filename, mem);
+
+  always @ (posedge clk) begin
+    if (write)
+      mem[write_address] <= din;
+    dout <= mem[read_address]; // dout doesn't get din in this clock cycle 
+                               // (this is due to Verilog non-blocking assignment "<=")
+  end 
+endmodule