Add zbuffer spec

remove "debug_bus"

1 files changed, 21 insertions, 0 deletions

diff --git a/eater_cpu/zbuffer.sv b/eater_cpu/zbuffer.sv
new file mode 100644
index 0000000..fd7e0f6
--- /dev/null
+++ b/eater_cpu/zbuffer.sv
@@ -0,0 +1,21 @@
+`timescale 1us/1us
+
+`ifndef ZBUFFER
+`define ZBUFFER
+
+module zbuffer #(
+  parameter BUFFER_WIDTH = 8
+) (
+  // async - output data
+  input wire en_output_in,
+
+  input wire [(BUFFER_WIDTH-1) : 0] data_in,
+  // output (to bus) if output enabled.
+  output wire [(BUFFER_WIDTH-1) : 0] data_out
+);
+
+assign data_out = en_output_in ? data_in : {BUFFER_WIDTH{1'bz}};
+
+endmodule
+
+`endif