From cb0be9e2039569ee7d18657e8f675d1f8369b407 Mon Sep 17 00:00:00 2001
From: Flavian Kaufmann <flavian@flaviankaufmann.ch>
Date: Tue, 21 May 2024 13:50:28 +0200
Subject: restructured project

---
 rtl/src/io.v | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 rtl/src/io.v

(limited to 'rtl/src/io.v')

diff --git a/rtl/src/io.v b/rtl/src/io.v
new file mode 100644
index 0000000..f53062b
--- /dev/null
+++ b/rtl/src/io.v
@@ -0,0 +1,30 @@
+module io (
+  input clk,
+  input rstn,
+
+  input we,
+  input [31:0] addr,
+  input [31:0] wd,
+
+  output reg [31:0] rd,
+
+  input [31:0] io_in,
+  output reg [31:0] io_out
+);
+
+`include "include/consts.vh"
+
+always @ (posedge clk or negedge rstn) begin
+  if (!rstn) begin
+    io_out <= 32'b0;
+  end else if (we && addr == 32'h0000_0004) begin
+    io_out <= wd;
+  end
+end
+
+always @ (posedge clk) begin
+  if      (addr == 32'h0000_0000) rd <= io_in;
+  else if (addr == 32'h0000_0004) rd <= io_out;
+  else                            rd <= 32'b0;
+end
+endmodule
\ No newline at end of file
-- 
cgit v1.2.3