Subversion Repositories pss

/*

 PSS

 Copyright (c) 2016 Alexander Antonov <153287@niuitmo.ru>

 All rights reserved.

 Version 0.99

 The FreeBSD license

 Redistribution and use in source and binary forms, with or without

 modification, are permitted provided that the following conditions

 are met:

 1. Redistributions of source code must retain the above copyright

    notice, this list of conditions and the following disclaimer.

 2. Redistributions in binary form must reproduce the above

    copyright notice, this list of conditions and the following

    disclaimer in the documentation and/or other materials

    provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY

 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

 PSS PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

module pss_soc_top

(

        input clk_i, rst_i,

        input rx_i,

        output tx_o,

        input ext_int_i,

        input  [7:0] SW,

        output reg [7:0] LED

);

wire sync_reset;

wire uc_bus_enb;

wire uc_bus_we;

wire [31:0] uc_bus_addr;

wire [31:0] uc_bus_wdata;

reg [31:0] uc_bus_rdata;

reg uc_bus_resp;

wire ext_int;

debouncer debouncer

(

        .clk_i(clk_i),

        .rst_i(rst_i),

        .in_i(ext_int_i),

        .out_o(ext_int)

);

wire [3:0] interrupts;

assign interrupts = {3'h0, ext_int};

pss

#(

        .CPU_PRESENT(1),

        .CPU_RESET_DEFAULT(0),

        .A31_DEFAULT(1),

        .MEM_DATA("<path_to_svn>/pss/trunk/pss/SW/onboard/Heartbeat/Heartbeat.hex"),

        .MEM_SIZE_KB(8)

)

PSS

(

        .clk_i(clk_i),

        .arst_i(rst_i),

        .srst_i(0),

        .srst_o(sync_reset),

        .rx_i(rx_i),

        .tx_o(tx_o),

        .INT_bi(interrupts),

        .xport_req_o(uc_bus_enb),

        .xport_ack_i(1'b1),

        .xport_err_i(1'b0),

        .xport_we_o(uc_bus_we),

        .xport_addr_bo(uc_bus_addr),

        .xport_wdata_bo(uc_bus_wdata),

        .xport_resp_i(uc_bus_resp),

        .xport_rdata_bi(uc_bus_rdata)

);

always @(posedge clk_i)

        begin

        if (rst_i) uc_bus_rdata <= 32'h0;

        else if (uc_bus_addr == 32'h8A000000) uc_bus_rdata <= SW;

        else uc_bus_rdata <= uc_bus_addr;

        end

always @(posedge clk_i)

        begin

        if (rst_i)

                uc_bus_resp <= 1'b0;

        else if ( (uc_bus_enb == 1'b1) && (uc_bus_we == 1'b0) )

                uc_bus_resp <= 1'b1;

        else

                uc_bus_resp <= 1'b0;

        end

always @(posedge clk_i)

        begin

        if (sync_reset)

                LED <= 8'hAA;

        else if (uc_bus_we)

                LED <= uc_bus_wdata;

        end

//assign uc_bus_rdata = uc_bus_addr;

endmodule