Subversion Repositories versatile_io

`include "include/versatile_io_defines.v"

`ifdef UART0

`include "uart16550_ip.v"

`endif

module versatile_io (

    input [31:0] wbs_dat_i,

    input [31:0] wbs_adr_i,

    input [3:0] wbs_sel_i,

    input wbs_we_i, wbs_stb_i, wbs_cyc_i,

    output [31:0] wbs_dat_o,

    output wbs_ack_o;

`ifdef B4

    output wbs_stall_o,

`endif

`include "versatile_io_module.v"

`ifdef UART0

    output uart0_irq,

`endif

    input wbs_clk, wbs_rst,

    input clk, rst

);

function [7:0] tobyte;

input [3:0] sel_i;

input [31:0] dat_i;

begin

    tobyte = ({8{sel_i[3]}} & dat_i[31:24]) | ({8{sel_i[2]}} & dat_i[23:16]) | ({8{sel_i[1]}} & dat_i[15:8]) | ({8{sel_i[0]}} & dat_i[7:0]);

endfunction

function [31:0] toword;

input [7:0] dat_i;

begin

    toword = {4{dat_i}};

endfunction

function [31:0] mask;

input [31:0] dat_i;

input sel;

begin

    mask = {32{sel}} & dat_i;

end

function cs;

input [31:0] adr;

input [31:0] mem_map;

input [4:0] mem_map_hi;

input [4:0] mem_map_lo;

begin

    cs = adr[mem_map_hi:mem_map_lo] == mem_map[mem_map_hi:mem_map_lo];

endfunction

`ifdef UART0

wire uart0_cs = cs( wbs_adr_i, `UART0_BASE, `UART0_MEM_MAP_HI, `UART0_MEM_MAP_LO);

wire [7:0] uart0_temp;

wire uart0_ack_o;

uart_top uart0  (

    .wb_clk_i(wbs_clk), wb_rst_i(wbs_rst),

    // Wishbone signals

    .wb_adr_i(wbs_adr_i[2:0]), .wb_dat_i(tobyte(wbs_sel_i,wbs_dat_i)), .wb_dat_o(uart0_temp), .wb_we_i(wbs_we_i), .wb_stb_i(wbs_stb_i), .wb_cyc_i(wbs_cyc_i & uart0_cs), .wb_ack_o(uart0_ack_o), .wb_sel_i(4'b0),

    .int_o(uart0_irq), // interrupt request

    // UART     signals

    // serial input/output

    .stx_pad_o(uart0_tx_pad_i), .srx_pad_i(uart0_rx_pad_i),

    // modem signals

    .rts_pad_o(), .cts_pad_i(1'b0), .dtr_pad_o(), .dsr_pad_i(1'b0), .ri_pad_i(1'b0), .dcd_pad_i(1'b0) );

assign uart0_dat_o = mask( toword(uart0_temp), uart0_ack_o);

`else

assign uart0_dat_o = 32'h0;

assign uart0_ack_o = 1'b0;

`endif

assign wbs_dat_o = uart0_dat_o;

assign wbs_ack_o = uart0_ack_o;

`ifdef WB4

assign wbs_stall_o = 1'b0;

`endif

endmodule