diff --git a/tests/hdl/beh/wb.sv b/tests/hdl/beh/wb.sv
new file mode 100644
index 0000000..a90b85c
--- /dev/null
+++ b/tests/hdl/beh/wb.sv
@@ -0,0 +1,70 @@
+interface wb #(
+  parameter ADDR_W = 16,
+  parameter DATA_W = 32,
+  parameter STRB_W = DATA_W/8
+) (
+  // synthesis translate_off
+  input clk,
+  input reset
+  // synthesis translate_on
+);
+  logic  [ADDR_W-1:0] wb_adr_i  ; 
+  logic  [DATA_W-1:0] wb_dat_i  ; 
+  logic               wb_we_i   ; 
+  logic               wb_stb_i  ; 
+  logic               wb_cyc_i  ; 
+  logic  [STRB_W-1:0] wb_sel_i  ; 
+  logic  [DATA_W-1:0] wb_dat_o  ; 
+  logic               wb_ack_o  ; 
+
+  logic [ADDR_W-1:0] address      ;
+  logic              read_s = 0   ;
+  logic [DATA_W-1:0] readdata     ;
+  logic              readdatavalid;
+  logic [STRB_W-1:0] byteenable   ;
+  logic              write_s      ;
+  logic [DATA_W-1:0] writedata    ;
+  logic              waitrequest  ;
+
+  task write(
+    input logic [ADDR_W-1:0] addr,
+    input logic [DATA_W-1:0] data,
+    input logic [STRB_W-1:0] strb = {STRB_W{1'b1}}
+  );
+    @(posedge clk);
+    wb_adr_i = addr;
+    wb_dat_i = data;
+    wb_sel_i = strb;
+    wb_we_i  = 1;
+    wb_stb_i = 1;
+    wb_cyc_i = 1;
+    wait(wb_ack_o);
+    @(posedge clk);
+    wb_adr_i = 0;
+    wb_dat_i = 0;
+    wb_sel_i = 0;
+    wb_we_i  = 0;
+    wb_stb_i = 0;
+    wb_cyc_i = 0;
+  endtask : write
+
+
+  task read(
+    input logic [ADDR_W-1:0] addr,
+    output logic [DATA_W-1:0] data
+  );
+    @(posedge clk);
+    wb_adr_i = addr;
+    wb_we_i  = 0;
+    wb_stb_i = 1;
+    wb_cyc_i = 1;
+    wait(wb_ack_o);
+    @(posedge clk);
+    wb_adr_i = 0;
+    wb_we_i  = 0;
+    wb_stb_i = 0;
+    wb_cyc_i = 0;
+    data = readdata;
+  endtask : read
+
+endinterface