git.zerfleddert.de Git - raggedstone/blob - dhwk_old/source/wb_fifo.v

   1 module wb_fifo (clk_i, nrst_i, wb_adr_i, wb_dat_o, wb_dat_i, wb_sel_i, wb_we_i,
   2         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);
   3
   4         input clk_i;
   5         input nrst_i;
   6         input [24:1] wb_adr_i;
   7         output [15:0] wb_dat_o;
   8         input [15:0] wb_dat_i;
   9         input [1:0] wb_sel_i;
  10         input wb_we_i;
  11         input wb_stb_i;
  12         input wb_cyc_i;
  13         output wb_ack_o;
  14         output wb_err_o;
  15         output wb_int_o;
  16         input [7:0] fifo_data_i;
  17         output [7:0] fifo_data_o;
  18         output fifo_we_o;
  19         output fifo_re_o;
  20
  21         reg [15:0] data_reg;
  22
  23         always @(posedge clk_i or negedge nrst_i)
  24         begin
  25                 if (nrst_i == 0)
  26                         data_reg <= 16'h0000;
  27                 else
  28                         if (wb_stb_i && wb_we_i)
  29                                 data_reg <= wb_dat_i;
  30         end
  31
  32         assign fifo_we_o = 1'b1;
  33         assign fifo_data_o = data_reg;
  34
  35         assign wb_ack_o = wb_stb_i;
  36         assign wb_err_o = 1'b0;
  37         assign wb_int_o = 1'b0;
  38         assign wb_dat_o = data_reg;
  39
  40 endmodule