created a wishbone wrapper for openram

verilog/rtl/wishbone_wrapper.v

diff --git a/verilog/rtl/wishbone_wrapper.v b/verilog/rtl/wishbone_wrapper.v
new file mode 100644
index 0000000..10e4b33
--- /dev/null
+++ b/verilog/rtl/wishbone_wrapper.v
@@ -0,0 +1,71 @@
+`default_nettype none
+
+module wishbone_wrapper
+#(
+	parameter BASE_ADDR = 32'h30c0_0000,
+    parameter ADDR_WIDTH = 8
+)
+(
+	`ifdef USE_POWER_PINS
+	    inout vccd1,	// User area 1 1.8V supply
+	    inout vssd1,	// User area 1 digital ground
+	`endif
+
+    // Wishbone port A
+    input           wb_clk_i,
+    input           wb_rst_i,
+    input           wbs_stb_i,
+    input           wbs_cyc_i,
+    input           wbs_we_i,
+    input   [3:0]   wbs_sel_i,
+    input   [31:0]  wbs_dat_i,
+    input   [31:0]  wbs_adr_i,
+    output          wbs_ack_o,
+    output  [31:0]  wbs_dat_o,
+
+    // OpenRAM interface - almost dual port: RW + R
+    // Port 0: RW
+    output                      ram_clk0,       // clock
+    output                      ram_csb0,       // active low chip select
+    output                      ram_web0,       // active low write control
+    output  [3:0]              	ram_wmask0,     // write (byte) mask
+    output  [ADDR_WIDTH-1:0]    ram_addr0,
+    input   [31:0]              ram_din0,
+    output  [31:0]              ram_dout0
+);
+
+	parameter ADDR_LO_MASK = (1 << ADDR_WIDTH) - 1;
+	parameter ADDR_HI_MASK = 32'hffff_ffff - ADDR_LO_MASK;
+	
+	wire ram_cs;
+	assign ram_cs = wbs_stb_i && wbs_cyc_i && ((wbs_adr_i & ADDR_HI_MASK) == BASE_ADDR) && !wb_rst_i;
+	
+	reg ram_cs_r;
+	reg ram_wbs_ack_r;
+	always @(negedge wb_clk_i) begin
+	    if (wb_rst_i) begin
+	        ram_cs_r <= 0;
+	        ram_wbs_ack_r <= 0;
+	    end
+	    else begin
+	        ram_cs_r <= !ram_cs_r && ram_cs;
+	        ram_wbs_ack_r <= ram_cs_r;
+	    end
+	end
+	     
+	assign ram_clk0 = wb_clk_i;
+	assign ram_csb0 = !ram_cs_r;
+	assign ram_web0 = ~wbs_we_i;
+	assign ram_wmask0 = wbs_sel_i;
+	assign ram_addr0 = wbs_adr_i[ADDR_WIDTH-1:0];
+	assign ram_dout0 = wbs_dat_i;
+	
+	assign wbs_dat_o = ram_din0;
+	assign wbs_ack_o = ram_wbs_ack_r && ram_cs;
+
+
+
+
+endmodule
+
+`default_nettype wire