module fpga (
    /*
     * Clock and reset
     */
    output wire       user_sma_clk_p,
    output wire       user_sma_clk_n,
    /*
     * GPIO
     */
    input  wire       btnu,
    input  wire       btnl,
    input  wire       btnd,
    input  wire       btnr,
    input  wire       btnc,
    input  wire [3:0] sw,
    output wire [7:0] led,

    /*
     * PCI express
     */
    input  wire [7:0] pcie_rx_p,
    input  wire [7:0] pcie_rx_n,
    output wire [7:0] pcie_tx_p,
    output wire [7:0] pcie_tx_n,
    input  wire       pcie_mgt_refclk_p,
    input  wire       pcie_mgt_refclk_n,
    input  wire       pcie_reset_n
);

parameter AXIS_PCIE_DATA_WIDTH = 256;
parameter AXIS_PCIE_KEEP_WIDTH = (AXIS_PCIE_DATA_WIDTH/32);
parameter AXIS_PCIE_RC_USER_WIDTH = 75;
parameter AXIS_PCIE_RQ_USER_WIDTH = 60;
parameter AXIS_PCIE_CQ_USER_WIDTH = 85;
parameter AXIS_PCIE_CC_USER_WIDTH = 33;
parameter RC_STRADDLE = AXIS_PCIE_DATA_WIDTH >= 256;
parameter RQ_STRADDLE = AXIS_PCIE_DATA_WIDTH >= 512;
parameter CQ_STRADDLE = AXIS_PCIE_DATA_WIDTH >= 512;
parameter CC_STRADDLE = AXIS_PCIE_DATA_WIDTH >= 512;

parameter RQ_SEQ_NUM_WIDTH = AXIS_PCIE_RQ_USER_WIDTH == 60 ? 4 : 6;
parameter RQ_SEQ_NUM_ENABLE = 1;

parameter PCIE_TAG_COUNT = 64;
parameter BAR0_APERTURE = 24;
parameter BAR2_APERTURE = 24;
parameter BAR4_APERTURE = 16;

// Clock and reset
wire pcie_user_clk;
wire pcie_user_reset;

// forward PCIe user clock out SMA connectors
OBUFDS
user_sma_clk_obufds_inst (
    .I(pcie_user_clk),
    .O(user_sma_clk_p),
    .OB(user_sma_clk_n)
);

// GPIO
wire btnu_int;
wire btnl_int;
wire btnd_int;
wire btnr_int;
wire btnc_int;
wire [3:0] sw_int;

debounce_switch #(
    .WIDTH(9),
    .N(4),
    .RATE(250000)
)
debounce_switch_inst (
    .clk(pcie_user_clk),
    .rst(pcie_user_reset),
    .in({btnu,
        btnl,
        btnd,
        btnr,
        btnc,
        sw}),
    .out({btnu_int,
        btnl_int,
        btnd_int,
        btnr_int,
        btnc_int,
        sw_int})
);

// PCIe
wire pcie_sys_clk;
wire pcie_sys_clk_gt;

IBUFDS_GTE3 #(
    .REFCLK_HROW_CK_SEL(2'b00)
)
ibufds_gte3_pcie_mgt_refclk_inst (
    .I             (pcie_mgt_refclk_p),
    .IB            (pcie_mgt_refclk_n),
    .CEB           (1'b0),
    .O             (pcie_sys_clk_gt),
    .ODIV2         (pcie_sys_clk)
);

wire [AXIS_PCIE_DATA_WIDTH-1:0]    axis_rq_tdata;
wire [AXIS_PCIE_KEEP_WIDTH-1:0]    axis_rq_tkeep;
wire                               axis_rq_tlast;
wire                               axis_rq_tready;
wire [AXIS_PCIE_RQ_USER_WIDTH-1:0] axis_rq_tuser;
wire                               axis_rq_tvalid;

wire [AXIS_PCIE_DATA_WIDTH-1:0]    axis_rc_tdata;
wire [AXIS_PCIE_KEEP_WIDTH-1:0]    axis_rc_tkeep;
wire                               axis_rc_tlast;
wire                               axis_rc_tready;
wire [AXIS_PCIE_RC_USER_WIDTH-1:0] axis_rc_tuser;
wire                               axis_rc_tvalid;

wire [AXIS_PCIE_DATA_WIDTH-1:0]    axis_cq_tdata;
wire [AXIS_PCIE_KEEP_WIDTH-1:0]    axis_cq_tkeep;
wire                               axis_cq_tlast;
wire                               axis_cq_tready;
wire [AXIS_PCIE_CQ_USER_WIDTH-1:0] axis_cq_tuser;
wire                               axis_cq_tvalid;

wire [AXIS_PCIE_DATA_WIDTH-1:0]    axis_cc_tdata;
wire [AXIS_PCIE_KEEP_WIDTH-1:0]    axis_cc_tkeep;
wire                               axis_cc_tlast;
wire                               axis_cc_tready;
wire [AXIS_PCIE_CC_USER_WIDTH-1:0] axis_cc_tuser;
wire                               axis_cc_tvalid;

wire [RQ_SEQ_NUM_WIDTH-1:0]        pcie_rq_seq_num;
wire                               pcie_rq_seq_num_vld;

// ila_0 rq_ila (
//     .clk(pcie_user_clk),
//     .probe0(axis_rq_tdata),
//     .probe1(axis_rq_tkeep),
//     .probe2(axis_rq_tlast),
//     .probe3(axis_rq_tready),
//     .probe4(axis_rq_tuser),
//     .probe5(axis_rq_tvalid)
// );

// ila_0 rc_ila (
//     .clk(pcie_user_clk),
//     .probe0(axis_rc_tdata),
//     .probe1(axis_rc_tkeep),
//     .probe2(axis_rc_tlast),
//     .probe3(axis_rc_tready),
//     .probe4(axis_rc_tuser),
//     .probe5(axis_rc_tvalid)
// );

wire [2:0] cfg_max_payload;
wire [2:0] cfg_max_read_req;
wire [3:0] cfg_rcb_status;

wire [18:0] cfg_mgmt_addr;
wire        cfg_mgmt_write;
wire [31:0] cfg_mgmt_write_data;
wire [3:0]  cfg_mgmt_byte_enable;
wire        cfg_mgmt_read;
wire [31:0] cfg_mgmt_read_data;
wire        cfg_mgmt_read_write_done;

wire [7:0]  cfg_fc_ph;
wire [11:0] cfg_fc_pd;
wire [7:0]  cfg_fc_nph;
wire [11:0] cfg_fc_npd;
wire [7:0]  cfg_fc_cplh;
wire [11:0] cfg_fc_cpld;
wire [2:0]  cfg_fc_sel;

wire [1:0]  cfg_interrupt_msix_enable;
wire [1:0]  cfg_interrupt_msix_mask;
wire [7:0]  cfg_interrupt_msix_vf_enable;
wire [7:0]  cfg_interrupt_msix_vf_mask;
wire [63:0] cfg_interrupt_msix_address;
wire [31:0] cfg_interrupt_msix_data;
wire        cfg_interrupt_msix_int;
wire        cfg_interrupt_msix_sent;
wire        cfg_interrupt_msix_fail;
wire [3:0]  cfg_interrupt_msi_function_number;

wire status_error_cor;
wire status_error_uncor;

pcie3_ultrascale_0
pcie3_ultrascale_inst (
    .pci_exp_txn(pcie_tx_n),
    .pci_exp_txp(pcie_tx_p),
    .pci_exp_rxn(pcie_rx_n),
    .pci_exp_rxp(pcie_rx_p),
    .user_clk(pcie_user_clk),
    .user_reset(pcie_user_reset),
    .user_lnk_up(),

    .s_axis_rq_tdata(axis_rq_tdata),
    .s_axis_rq_tkeep(axis_rq_tkeep),
    .s_axis_rq_tlast(axis_rq_tlast),
    .s_axis_rq_tready(axis_rq_tready),
    .s_axis_rq_tuser(axis_rq_tuser),
    .s_axis_rq_tvalid(axis_rq_tvalid),

    .m_axis_rc_tdata(axis_rc_tdata),
    .m_axis_rc_tkeep(axis_rc_tkeep),
    .m_axis_rc_tlast(axis_rc_tlast),
    .m_axis_rc_tready(axis_rc_tready),
    .m_axis_rc_tuser(axis_rc_tuser),
    .m_axis_rc_tvalid(axis_rc_tvalid),

    .m_axis_cq_tdata(axis_cq_tdata),
    .m_axis_cq_tkeep(axis_cq_tkeep),
    .m_axis_cq_tlast(axis_cq_tlast),
    .m_axis_cq_tready(axis_cq_tready),
    .m_axis_cq_tuser(axis_cq_tuser),
    .m_axis_cq_tvalid(axis_cq_tvalid),

    .s_axis_cc_tdata(axis_cc_tdata),
    .s_axis_cc_tkeep(axis_cc_tkeep),
    .s_axis_cc_tlast(axis_cc_tlast),
    .s_axis_cc_tready(axis_cc_tready),
    .s_axis_cc_tuser(axis_cc_tuser),
    .s_axis_cc_tvalid(axis_cc_tvalid),

    .pcie_rq_seq_num(pcie_rq_seq_num),
    .pcie_rq_seq_num_vld(pcie_rq_seq_num_vld),
    .pcie_rq_tag(),
    .pcie_rq_tag_av(),
    .pcie_rq_tag_vld(),

    .pcie_tfc_nph_av(),
    .pcie_tfc_npd_av(),

    .pcie_cq_np_req(1'b1),
    .pcie_cq_np_req_count(),

    .cfg_phy_link_down(),
    .cfg_phy_link_status(),
    .cfg_negotiated_width(),
    .cfg_current_speed(),
    .cfg_max_payload(cfg_max_payload),
    .cfg_max_read_req(cfg_max_read_req),
    .cfg_function_status(),
    .cfg_function_power_state(),
    .cfg_vf_status(),
    .cfg_vf_power_state(),
    .cfg_link_power_state(),

    .cfg_mgmt_addr(cfg_mgmt_addr),
    .cfg_mgmt_write(cfg_mgmt_write),
    .cfg_mgmt_write_data(cfg_mgmt_write_data),
    .cfg_mgmt_byte_enable(cfg_mgmt_byte_enable),
    .cfg_mgmt_read(cfg_mgmt_read),
    .cfg_mgmt_read_data(cfg_mgmt_read_data),
    .cfg_mgmt_read_write_done(cfg_mgmt_read_write_done),
    .cfg_mgmt_type1_cfg_reg_access(1'b0),

    .cfg_err_cor_out(),
    .cfg_err_nonfatal_out(),
    .cfg_err_fatal_out(),
    .cfg_local_error(),
    .cfg_ltr_enable(),
    .cfg_ltssm_state(),
    .cfg_rcb_status(cfg_rcb_status),
    .cfg_dpa_substate_change(),
    .cfg_obff_enable(),
    .cfg_pl_status_change(),
    .cfg_tph_requester_enable(),
    .cfg_tph_st_mode(),
    .cfg_vf_tph_requester_enable(),
    .cfg_vf_tph_st_mode(),

    .cfg_msg_received(),
    .cfg_msg_received_data(),
    .cfg_msg_received_type(),
    .cfg_msg_transmit(1'b0),
    .cfg_msg_transmit_type(3'd0),
    .cfg_msg_transmit_data(32'd0),
    .cfg_msg_transmit_done(),

    .cfg_fc_ph(cfg_fc_ph),
    .cfg_fc_pd(cfg_fc_pd),
    .cfg_fc_nph(cfg_fc_nph),
    .cfg_fc_npd(cfg_fc_npd),
    .cfg_fc_cplh(cfg_fc_cplh),
    .cfg_fc_cpld(cfg_fc_cpld),
    .cfg_fc_sel(cfg_fc_sel),

    .cfg_per_func_status_control(3'd0),
    .cfg_per_func_status_data(),
    .cfg_per_function_number(4'd0),
    .cfg_per_function_output_request(1'b0),
    .cfg_per_function_update_done(),

    .cfg_dsn(64'd0),

    .cfg_power_state_change_ack(1'b1),
    .cfg_power_state_change_interrupt(),

    .cfg_err_cor_in(status_error_cor),
    .cfg_err_uncor_in(status_error_uncor),
    .cfg_flr_in_process(),
    .cfg_flr_done(4'd0),
    .cfg_vf_flr_in_process(),
    .cfg_vf_flr_done(8'd0),

    .cfg_link_training_enable(1'b1),

    .cfg_interrupt_int(4'd0),
    .cfg_interrupt_pending(4'd0),
    .cfg_interrupt_sent(),
    .cfg_interrupt_msix_enable(cfg_interrupt_msix_enable),
    .cfg_interrupt_msix_mask(cfg_interrupt_msix_mask),
    .cfg_interrupt_msix_vf_enable(cfg_interrupt_msix_vf_enable),
    .cfg_interrupt_msix_vf_mask(cfg_interrupt_msix_vf_mask),
    .cfg_interrupt_msix_address(cfg_interrupt_msix_address),
    .cfg_interrupt_msix_data(cfg_interrupt_msix_data),
    .cfg_interrupt_msix_int(cfg_interrupt_msix_int),
    .cfg_interrupt_msix_sent(cfg_interrupt_msix_sent),
    .cfg_interrupt_msix_fail(cfg_interrupt_msix_fail),
    .cfg_interrupt_msi_function_number(cfg_interrupt_msi_function_number),

    .cfg_hot_reset_out(),

    .cfg_config_space_enable(1'b1),
    .cfg_req_pm_transition_l23_ready(1'b0),
    .cfg_hot_reset_in(1'b0),

    .cfg_ds_port_number(8'd0),
    .cfg_ds_bus_number(8'd0),
    .cfg_ds_device_number(5'd0),
    .cfg_ds_function_number(3'd0),

    .cfg_subsys_vend_id(16'h1234),

    .sys_clk(pcie_sys_clk),
    .sys_clk_gt(pcie_sys_clk_gt),
    .sys_reset(pcie_reset_n),
    .pcie_perstn1_in(1'b0),
    .pcie_perstn0_out(),
    .pcie_perstn1_out(),

    .int_qpll1lock_out(),
    .int_qpll1outrefclk_out(),
    .int_qpll1outclk_out(),
    .phy_rdy_out()
);

fpga_core #(
    .AXIS_PCIE_DATA_WIDTH(AXIS_PCIE_DATA_WIDTH),
    .AXIS_PCIE_KEEP_WIDTH(AXIS_PCIE_KEEP_WIDTH),
    .AXIS_PCIE_RC_USER_WIDTH(AXIS_PCIE_RC_USER_WIDTH),
    .AXIS_PCIE_RQ_USER_WIDTH(AXIS_PCIE_RQ_USER_WIDTH),
    .AXIS_PCIE_CQ_USER_WIDTH(AXIS_PCIE_CQ_USER_WIDTH),
    .AXIS_PCIE_CC_USER_WIDTH(AXIS_PCIE_CC_USER_WIDTH),
    .RC_STRADDLE(RC_STRADDLE),
    .RQ_STRADDLE(RQ_STRADDLE),
    .CQ_STRADDLE(CQ_STRADDLE),
    .CC_STRADDLE(CC_STRADDLE),
    .RQ_SEQ_NUM_WIDTH(RQ_SEQ_NUM_WIDTH),
    .RQ_SEQ_NUM_ENABLE(RQ_SEQ_NUM_ENABLE),
    .PCIE_TAG_COUNT(PCIE_TAG_COUNT),
    .BAR0_APERTURE(BAR0_APERTURE),
    .BAR2_APERTURE(BAR2_APERTURE),
    .BAR4_APERTURE(BAR4_APERTURE)
)
core_inst (
    /*
     * Clock: 250 MHz
     * Synchronous reset
     */
    .clk(pcie_user_clk),
    .rst(pcie_user_reset),
    /*
     * GPIO
     */
    .btnu(btnu_int),
    .btnl(btnl_int),
    .btnd(btnd_int),
    .btnr(btnr_int),
    .btnc(btnc_int),
    .sw(sw_int),
    .led(led),
    /*
     * PCIe
     */
    .m_axis_rq_tdata(axis_rq_tdata),
    .m_axis_rq_tkeep(axis_rq_tkeep),
    .m_axis_rq_tlast(axis_rq_tlast),
    .m_axis_rq_tready(axis_rq_tready),
    .m_axis_rq_tuser(axis_rq_tuser),
    .m_axis_rq_tvalid(axis_rq_tvalid),

    .s_axis_rc_tdata(axis_rc_tdata),
    .s_axis_rc_tkeep(axis_rc_tkeep),
    .s_axis_rc_tlast(axis_rc_tlast),
    .s_axis_rc_tready(axis_rc_tready),
    .s_axis_rc_tuser(axis_rc_tuser),
    .s_axis_rc_tvalid(axis_rc_tvalid),

    .s_axis_cq_tdata(axis_cq_tdata),
    .s_axis_cq_tkeep(axis_cq_tkeep),
    .s_axis_cq_tlast(axis_cq_tlast),
    .s_axis_cq_tready(axis_cq_tready),
    .s_axis_cq_tuser(axis_cq_tuser),
    .s_axis_cq_tvalid(axis_cq_tvalid),

    .m_axis_cc_tdata(axis_cc_tdata),
    .m_axis_cc_tkeep(axis_cc_tkeep),
    .m_axis_cc_tlast(axis_cc_tlast),
    .m_axis_cc_tready(axis_cc_tready),
    .m_axis_cc_tuser(axis_cc_tuser),
    .m_axis_cc_tvalid(axis_cc_tvalid),

    .s_axis_rq_seq_num(pcie_rq_seq_num),
    .s_axis_rq_seq_num_valid(pcie_rq_seq_num_vld),

    .cfg_max_payload(cfg_max_payload),
    .cfg_max_read_req(cfg_max_read_req),
    .cfg_rcb_status(cfg_rcb_status),

    .cfg_mgmt_addr(cfg_mgmt_addr),
    .cfg_mgmt_write(cfg_mgmt_write),
    .cfg_mgmt_write_data(cfg_mgmt_write_data),
    .cfg_mgmt_byte_enable(cfg_mgmt_byte_enable),
    .cfg_mgmt_read(cfg_mgmt_read),
    .cfg_mgmt_read_data(cfg_mgmt_read_data),
    .cfg_mgmt_read_write_done(cfg_mgmt_read_write_done),

    .cfg_fc_ph(cfg_fc_ph),
    .cfg_fc_pd(cfg_fc_pd),
    .cfg_fc_nph(cfg_fc_nph),
    .cfg_fc_npd(cfg_fc_npd),
    .cfg_fc_cplh(cfg_fc_cplh),
    .cfg_fc_cpld(cfg_fc_cpld),
    .cfg_fc_sel(cfg_fc_sel),

    .cfg_interrupt_msix_enable(cfg_interrupt_msix_enable),
    .cfg_interrupt_msix_mask(cfg_interrupt_msix_mask),
    .cfg_interrupt_msix_vf_enable(cfg_interrupt_msix_vf_enable),
    .cfg_interrupt_msix_vf_mask(cfg_interrupt_msix_vf_mask),
    .cfg_interrupt_msix_address(cfg_interrupt_msix_address),
    .cfg_interrupt_msix_data(cfg_interrupt_msix_data),
    .cfg_interrupt_msix_int(cfg_interrupt_msix_int),
    .cfg_interrupt_msix_sent(cfg_interrupt_msix_sent),
    .cfg_interrupt_msix_fail(cfg_interrupt_msix_fail),
    .cfg_interrupt_msi_function_number(cfg_interrupt_msi_function_number),

    .status_error_cor(status_error_cor),
    .status_error_uncor(status_error_uncor)
);

endmodule