Create prefetcher.v
diff --git a/verilog/rtl/prefetcher.v b/verilog/rtl/prefetcher.v
new file mode 100644
index 0000000..681e0fd
--- /dev/null
+++ b/verilog/rtl/prefetcher.v
@@ -0,0 +1,132 @@
+module prefetcher (clk,address,cache_miss,prefetch_hit);
+
+ parameter way = 4;
+ parameter block_size_byte = 16;
+ parameter cache_size_byte = 1024;
+
+ parameter block_offset_index = $rtoi($ln(block_size_byte)/$ln(2)); //2
+ parameter set = cache_size_byte/(block_size_byte*way);
+ parameter set_index = $rtoi($ln(set)/$ln(2));
+
+ parameter prefetch_width = 32-block_offset_index + 1; // without data (tag+index+valid)
+
+ input clk,cache_miss;
+ input [31:0]address;
+ output reg prefetch_hit;
+
+
+ wire [31-set_index-block_offset_index:0] tag; // 23 bits..22:0
+ wire [set_index-1:0] index; //7 bits...6:0
+ wire [block_offset_index-1:0] block_offset; //2 bits...1:0
+
+
+ wire [set_index-1:0]temp_index;
+ wire [5:0]prefetch_fill_index;
+ wire valid_buffer_check, valid_fill_check;
+
+ reg [prefetch_width-1:0]prefetch_buffer[0:7];
+ wire [2:0] hit_index;
+ reg [2:0] way_index;
+ reg [1:0] find_state;
+ reg done,updated;
+ reg [prefetch_width-1:0] temp_data;
+ integer k;
+
+ assign block_offset = address[block_offset_index-1:0];
+ assign index = address[set_index+block_offset_index-1:block_offset_index];
+ assign tag =address[31:set_index+block_offset_index];
+ assign temp_index = index + 1;
+
+ assign valid_buffer_check = (prefetch_buffer[0][prefetch_width-1] && (prefetch_buffer[0][prefetch_width-2:0]==address[31:block_offset_index])) || (prefetch_buffer[1][prefetch_width-1] && (prefetch_buffer[1][prefetch_width-2:0]==address[31:block_offset_index])) || (prefetch_buffer[2][prefetch_width-1] && (prefetch_buffer[2][prefetch_width-2:0]==address[31:block_offset_index])) || (prefetch_buffer[3][prefetch_width-1] && (prefetch_buffer[3][prefetch_width-2:0]==address[31:block_offset_index])) || (prefetch_buffer[4][prefetch_width-1] && (prefetch_buffer[4][prefetch_width-2:0]==address[31:block_offset_index])) || (prefetch_buffer[5][prefetch_width-1] && (prefetch_buffer[5][prefetch_width-2:0]==address[31:block_offset_index])) || (prefetch_buffer[6][prefetch_width-1] && (prefetch_buffer[6][prefetch_width-2:0]==address[31:block_offset_index])) || (prefetch_buffer[7][prefetch_width-1] && (prefetch_buffer[7][prefetch_width-2:0]==address[31:block_offset_index]));
+
+ assign hit_index = (prefetch_buffer[0][prefetch_width-1] && (prefetch_buffer[0][prefetch_width-2:0]==address[31:block_offset_index])) ? 3'b000 :
+ (prefetch_buffer[1][prefetch_width-1] && (prefetch_buffer[1][prefetch_width-2:0]==address[31:block_offset_index])) ? 3'b001 :
+ (prefetch_buffer[2][prefetch_width-1] && (prefetch_buffer[2][prefetch_width-2:0]==address[31:block_offset_index])) ? 3'b010 :
+ (prefetch_buffer[3][prefetch_width-1] && (prefetch_buffer[3][prefetch_width-2:0]==address[31:block_offset_index])) ? 3'b011 :
+ (prefetch_buffer[4][prefetch_width-1] && (prefetch_buffer[4][prefetch_width-2:0]==address[31:block_offset_index])) ? 3'b100 :
+ (prefetch_buffer[5][prefetch_width-1] && (prefetch_buffer[5][prefetch_width-2:0]==address[31:block_offset_index])) ? 3'b101 :
+ (prefetch_buffer[6][prefetch_width-1] && (prefetch_buffer[6][prefetch_width-2:0]==address[31:block_offset_index])) ? 3'b110 : 3'b111;
+
+
+ assign valid_fill_check = (prefetch_buffer[0][prefetch_width-1] && (prefetch_buffer[0][prefetch_width-2:0]=={tag,temp_index})) || (prefetch_buffer[1][prefetch_width-1] && (prefetch_buffer[1][prefetch_width-2:0]=={tag,temp_index})) || (prefetch_buffer[2][prefetch_width-1] && (prefetch_buffer[2][prefetch_width-2:0]=={tag,temp_index})) || (prefetch_buffer[3][prefetch_width-1] && (prefetch_buffer[3][prefetch_width-2:0]=={tag,temp_index})) || (prefetch_buffer[4][prefetch_width-1] && (prefetch_buffer[4][prefetch_width-2:0]=={tag,temp_index})) || (prefetch_buffer[5][prefetch_width-1] && (prefetch_buffer[5][prefetch_width-2:0]=={tag,temp_index})) || (prefetch_buffer[6][prefetch_width-1] && (prefetch_buffer[6][prefetch_width-2:0]=={tag,temp_index})) || (prefetch_buffer[7][prefetch_width-1] && (prefetch_buffer[7][prefetch_width-2:0]=={tag,temp_index}));
+ initial
+ begin
+ for (k=0;k<8;k=k+1)
+ prefetch_buffer[k] = 0;
+ done = 0;
+ updated = 0;
+ prefetch_hit = 0;
+ find_state = 0;
+ end
+
+ always @ (posedge clk)
+ begin
+ case(find_state)
+ 2'b00: begin
+ done = 1'b0;
+ prefetch_hit = 1'b0;
+ if(cache_miss)
+ begin
+ find_state = 2'b01;
+ end
+ end
+
+ 2'b01: begin
+ if(done)
+ find_state = 2'b10;
+ else
+ begin
+ if(valid_buffer_check)
+ begin
+ prefetch_hit = 1'b1;
+ done = 1'b1;
+ end
+ else
+ begin
+ done =1'b1;
+ prefetch_hit=1'b0;
+ end
+ end
+ end
+
+ 2'b10: begin
+ if(updated)
+ begin
+ find_state = 2'b00;
+ updated = 1'b0;
+ end
+ else
+ begin
+ if(!prefetch_hit)
+ begin
+ if(valid_fill_check)
+ updated = 1'b1;
+ else
+ begin
+ prefetch_buffer[7] = prefetch_buffer[6];
+ prefetch_buffer[6] = prefetch_buffer[5];
+ prefetch_buffer[5] = prefetch_buffer[4];
+ prefetch_buffer[4] = prefetch_buffer[3];
+ prefetch_buffer[3] = prefetch_buffer[2];
+ prefetch_buffer[2] = prefetch_buffer[1];
+ prefetch_buffer[1] = prefetch_buffer[0];
+ prefetch_buffer[0] = {1'b1,tag,temp_index};
+ updated = 1'b1;
+ end
+ end
+
+ if(prefetch_hit)
+ begin
+ temp_data = prefetch_buffer[hit_index];
+ for (way_index=0;way_index<hit_index;way_index=way_index+1)
+ prefetch_buffer[hit_index-way_index]= prefetch_buffer[hit_index-way_index-1];
+ prefetch_buffer[0] = temp_data;
+
+ updated = 1'b1;
+ end
+
+ end
+ end
+ endcase
+ end
+endmodule
