add sources for ide daughterboard cpld

[raggedstone] / dhwk_old / source / wb_fifo.v

module wb_fifo (clk_i, nrst_i, wb_adr_i, wb_dat_o, wb_dat_i, wb_sel_i, wb_we_i, \r
	wb_stb_i, wb_cyc_i, wb_ack_o, wb_err_o, wb_int_o, fifo_data_i, fifo_data_o, fifo_we_o, fifo_re_o);\r
\r
	input clk_i;\r
	input nrst_i;\r
	input [24:1] wb_adr_i;\r
	output [15:0] wb_dat_o;\r
   	input [15:0] wb_dat_i;\r
	input [1:0] wb_sel_i;\r
   	input wb_we_i;\r
	input wb_stb_i;\r
	input wb_cyc_i;\r
	output wb_ack_o;\r
	output wb_err_o;\r
	output wb_int_o;\r
 	input [7:0] fifo_data_i;\r
 	output [7:0] fifo_data_o;\r
        output fifo_we_o;\r
        output fifo_re_o;\r
\r
	reg [15:0] data_reg;\r
\r
	always @(posedge clk_i or negedge nrst_i)\r
	begin\r
		if (nrst_i == 0)\r
			data_reg <= 16'h0000;\r
		else \r
                        if (wb_stb_i && wb_we_i)\r
                                data_reg <= wb_dat_i;\r
	end\r
\r
        assign fifo_we_o = 1'b1;\r
        assign fifo_data_o = data_reg;\r
\r
	assign wb_ack_o = wb_stb_i;\r
	assign wb_err_o = 1'b0;\r
	assign wb_int_o = 1'b0;\r
	assign wb_dat_o = data_reg;\r
\r
endmodule\r