Add 1st sketch of eater cpu

1 files changed, 35 insertions, 0 deletions

diff --git a/eater_cpu/eater_register.v b/eater_cpu/eater_register.v
new file mode 100644
index 0000000..0502c8a
--- /dev/null
+++ b/eater_cpu/eater_register.v
@@ -0,0 +1,35 @@
+`timescale 1us/1us
+
+`ifndef EATER_REGISTER
+`define EATER_REGISTER
+
+module eater_register #(
+  parameter DATA_WIDTH = 8
+) (
+  input clk_i,
+
+  // sync? async?
+  input en_store_i,
+  input en_output_i,
+
+  input [(DATA_WIDTH-1) : 0] data_i,
+  output [(DATA_WIDTH-1) : 0] data_o
+);
+
+reg [(DATA_WIDTH-1) : 0] r_datastore /* verilator public */;
+
+reg int_output_data;
+
+always @(posedge clk_i) begin
+  if (en_store_i) begin
+    r_datastore <= data_i;
+  end
+
+  int_output_data <= en_output_i;
+end
+
+assign data_o = int_output_data ? r_datastore : 'z;
+
+endmodule
+
+`endif