Subversion Repositories sdcard_mass_storage_controller

`include "sd_defines.v"

module sd_fifo_rx_filler

(

input clk,

input rst,

//WB Signals

output  [31:0]  m_wb_adr_o,

output  reg        m_wb_we_o,

output reg [31:0]  m_wb_dat_o,

output    reg      m_wb_cyc_o,

output   reg       m_wb_stb_o,

input           m_wb_ack_i,

output  reg     [2:0] m_wb_cti_o,

output  reg [1:0]         m_wb_bte_o,

//Data Master Control signals

input en,

input [31:0] adr,

//Data Serial signals 

input sd_clk,

input [`SD_BUS_W-1:0] dat_i,

input wr,

output full

//

);

 wire [31:0] dat_o;

reg rd;

reg reset_rx_fifo;

sd_rx_fifo Rx_Fifo (

.d ( dat_i ),

.wr  (  wr ),

.wclk  (sd_clk),

.q ( dat_o),

.rd (rd),

.full (full),

.empty (empty),

.mem_empt (),

.rclk (clk),

.rst  (rst | reset_rx_fifo)

);

//reg [31:0] tmp_dat;

reg [8:0] offset;

assign  m_wb_adr_o = adr+offset;

//assign  m_wb_dat_o = dat_o;

reg wb_free;

always @(posedge clk or posedge rst )begin

 if (rst) begin

  offset<=0;

  m_wb_we_o <=0;

        m_wb_cyc_o <= 0;

        m_wb_stb_o <= 0;

        wb_free<=1;

        m_wb_dat_o<=0;

        rd<=0;

        reset_rx_fifo<=1;

        m_wb_bte_o <= 2'b00;

                m_wb_cti_o <= 3'b000;

 end

 else if (en)  begin//Start filling the RX buffer

    rd<=0;

    reset_rx_fifo<=0;

  if (!empty & wb_free) begin

    rd<=1;

    m_wb_dat_o<=#1 dat_o;

    m_wb_we_o <=#1 1;

                m_wb_cyc_o <=#1 1;

                m_wb_stb_o <=#1 1;

    wb_free<=0;

  end

  if(  !wb_free & m_wb_ack_i) begin

    m_wb_we_o <=0;

                m_wb_cyc_o <= 0;

                m_wb_stb_o <= 0;

                offset<=offset+`MEM_OFFSET;

                wb_free<=1;

        end

end

else begin

   reset_rx_fifo<=1;

    rd<=0;

   offset<=0;

        m_wb_cyc_o <= 0;

                        m_wb_stb_o <= 0;

                        m_wb_we_o <=0;

                        wb_free<=1;

  end

end

endmodule