rtl/cache: implement

1 files changed, 49 insertions, 0 deletions

diff --git a/rtl/cache/sram.sv b/rtl/cache/sram.sv
new file mode 100644
index 0000000..2e6c6ce
--- /dev/null
+++ b/rtl/cache/sram.sv
@@ -0,0 +1,49 @@
+`include "cache/defs.sv"
+
+module cache_sram
+(
+	input  logic      clk,
+	                  rst_n,
+
+	input  addr_index index_rd,
+	                  index_wr,
+	input  logic      write_data,
+	                  write_state,
+	input  addr_tag   tag_wr,
+	input  line       data_wr,
+	input  line_state state_wr,
+
+	output addr_tag   tag_rd,
+	output line       data_rd,
+	output line_state state_rd
+);
+
+	// Existe un mito que habla de true dual-ports con byte-enables, dudo mucho que sea real:
+	// https://www.intel.com/content/www/us/en/docs/programmable/683082/21-3/ram-with-byte-enable-signals.html
+
+	localparam DEPTH = 1 << $bits(addr_index);
+
+	line data_file[DEPTH];
+	addr_tag tag_file[DEPTH];
+	line_state state_file[DEPTH];
+
+	always_ff @(posedge clk) begin
+		if (write_data) begin
+			tag_file[index_wr] <= tag_wr;
+			data_file[index_wr] <= data_wr;
+		end
+
+		if (write_state)
+			state_file[index_wr] <= state_wr;
+
+		tag_rd <= tag_file[index_rd];
+		data_rd <= data_file[index_rd];
+		state_rd <= state_file[index_rd];
+	end
+
+	//FIXME: rst_n para state_file?
+	initial
+		for (int i = 0; i < DEPTH; ++i)
+			state_file[i] = INVALID;
+
+endmodule