SummerCart64/fw/v2/rtl/SummerCart64.sv

module SummerCart64 (
    input i_clk,

    output o_ftdi_clk,
    output o_ftdi_si,
    input i_ftdi_so,
    input i_ftdi_cts,

    input i_n64_reset,
    input i_n64_nmi,
    output o_n64_int,

    input i_n64_pi_alel,
    input i_n64_pi_aleh,
    input i_n64_pi_read,
    input i_n64_pi_write,
    inout [15:0] io_n64_pi_ad,

    input i_n64_si_clk,
    inout io_n64_si_dq,

    output o_sdram_clk,
    output o_sdram_cs,
    output o_sdram_ras,
    output o_sdram_cas,
    output o_sdram_we,
    output [1:0] o_sdram_ba,
    output [12:0] o_sdram_a,
    inout [15:0] io_sdram_dq,

    output o_sd_clk,
    inout io_sd_cmd,
    inout [3:0] io_sd_dat,

    output o_rtc_scl,
    inout io_rtc_sda,

    output o_led,

    inout [7:0] io_pmod
);

    if_pll if_pll_inst (.in_clk(i_clk));

    pll pll_inst (.iface(if_pll_inst));



    reg [31:0] counter;

    always_ff @(posedge if_pll_inst.sys.clk) begin
        counter <= counter + 1'd1;
        if (counter >= 32'd100_000_000) begin
            counter <= 1'd0;
        end
    end

    always_comb begin
        o_led = counter < 32'd1_000_000;
    end

endmodule