Subversion Repositories pcie_sg_dma

//-----------------------------------------------------------------------------

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//-----------------------------------------------------------------------------

// Project    : Virtex-6 Integrated Block for PCI Express

// File       : pcie_pipe_lane_v6.v

//--

//-- Description: PIPE per lane module for Virtex6 PCIe Block

//--

//--

//--

//--------------------------------------------------------------------------------

`timescale 1ns/1ns

module pcie_pipe_lane_v6 #

(

    parameter        PIPE_PIPELINE_STAGES = 0    // 0 - 0 stages, 1 - 1 stage, 2 - 2 stages

)

(

    output  wire [ 1:0] pipe_rx_char_is_k_o     ,

    output  wire [15:0] pipe_rx_data_o         ,

    output  wire        pipe_rx_valid_o         ,

    output  wire        pipe_rx_chanisaligned_o ,

    output  wire [ 2:0] pipe_rx_status_o        ,

    output  wire        pipe_rx_phy_status_o    ,

    output  wire        pipe_rx_elec_idle_o     ,

    input   wire        pipe_rx_polarity_i      ,

    input   wire        pipe_tx_compliance_i    ,

    input   wire [ 1:0] pipe_tx_char_is_k_i     ,

    input   wire [15:0] pipe_tx_data_i          ,

    input   wire        pipe_tx_elec_idle_i     ,

    input   wire [ 1:0] pipe_tx_powerdown_i     ,

    input  wire [ 1:0]  pipe_rx_char_is_k_i     ,

    input  wire [15:0]  pipe_rx_data_i         ,

    input  wire         pipe_rx_valid_i         ,

    input  wire         pipe_rx_chanisaligned_i ,

    input  wire [ 2:0]  pipe_rx_status_i        ,

    input  wire         pipe_rx_phy_status_i    ,

    input  wire         pipe_rx_elec_idle_i     ,

    output wire         pipe_rx_polarity_o      ,

    output wire         pipe_tx_compliance_o    ,

    output wire [ 1:0]  pipe_tx_char_is_k_o     ,

    output wire [15:0]  pipe_tx_data_o          ,

    output wire         pipe_tx_elec_idle_o     ,

    output wire [ 1:0]  pipe_tx_powerdown_o     ,

    input   wire        pipe_clk                ,

    input   wire        rst_n

);

//******************************************************************//

// Reality check.                                                   //

//******************************************************************//

    parameter TCQ  = 1;      // clock to out delay model

    reg [ 1:0]          pipe_rx_char_is_k_q     ;

    reg [15:0]          pipe_rx_data_q          ;

    reg                 pipe_rx_valid_q         ;

    reg                 pipe_rx_chanisaligned_q ;

    reg [ 2:0]          pipe_rx_status_q        ;

    reg                 pipe_rx_phy_status_q    ;

    reg                 pipe_rx_elec_idle_q     ;

    reg                 pipe_rx_polarity_q      ;

    reg                 pipe_tx_compliance_q    ;

    reg [ 1:0]          pipe_tx_char_is_k_q     ;

    reg [15:0]          pipe_tx_data_q          ;

    reg                 pipe_tx_elec_idle_q     ;

    reg [ 1:0]          pipe_tx_powerdown_q     ;

    reg [ 1:0]          pipe_rx_char_is_k_qq    ;

    reg [15:0]          pipe_rx_data_qq         ;

    reg                 pipe_rx_valid_qq        ;

    reg                 pipe_rx_chanisaligned_qq;

    reg [ 2:0]          pipe_rx_status_qq       ;

    reg                 pipe_rx_phy_status_qq   ;

    reg                 pipe_rx_elec_idle_qq    ;

    reg                 pipe_rx_polarity_qq     ;

    reg                 pipe_tx_compliance_qq   ;

    reg [ 1:0]          pipe_tx_char_is_k_qq    ;

    reg [15:0]          pipe_tx_data_qq         ;

    reg                 pipe_tx_elec_idle_qq    ;

    reg [ 1:0]          pipe_tx_powerdown_qq    ;

    generate

      if (PIPE_PIPELINE_STAGES == 0) begin

        assign pipe_rx_char_is_k_o = pipe_rx_char_is_k_i;

        assign pipe_rx_data_o = pipe_rx_data_i;

        assign pipe_rx_valid_o = pipe_rx_valid_i;

        assign pipe_rx_chanisaligned_o = pipe_rx_chanisaligned_i;

        assign pipe_rx_status_o = pipe_rx_status_i;

        assign pipe_rx_phy_status_o = pipe_rx_phy_status_i;

        assign pipe_rx_elec_idle_o = pipe_rx_elec_idle_i;

        assign pipe_rx_polarity_o = pipe_rx_polarity_i;

        assign pipe_tx_compliance_o = pipe_tx_compliance_i;

        assign pipe_tx_char_is_k_o = pipe_tx_char_is_k_i;

        assign pipe_tx_data_o = pipe_tx_data_i;

        assign pipe_tx_elec_idle_o = pipe_tx_elec_idle_i;

        assign pipe_tx_powerdown_o = pipe_tx_powerdown_i;

      end else if (PIPE_PIPELINE_STAGES == 1) begin

        always @(posedge pipe_clk) begin

          if (rst_n) begin

            pipe_rx_char_is_k_q <= #TCQ 0;

            pipe_rx_data_q <= #TCQ 0;

            pipe_rx_valid_q <= #TCQ 0;

            pipe_rx_chanisaligned_q <= #TCQ 0;

            pipe_rx_status_q <= #TCQ 0;

            pipe_rx_phy_status_q <= #TCQ 0;

            pipe_rx_elec_idle_q <= #TCQ 0;

            pipe_rx_polarity_q <= #TCQ 0;

            pipe_tx_compliance_q <= #TCQ 0;

            pipe_tx_char_is_k_q <= #TCQ 0;

            pipe_tx_data_q <= #TCQ 0;

            pipe_tx_elec_idle_q <= #TCQ 1'b1;

            pipe_tx_powerdown_q <= #TCQ 2'b10;

          end else begin

            pipe_rx_char_is_k_q <= #TCQ pipe_rx_char_is_k_i;

            pipe_rx_data_q <= #TCQ pipe_rx_data_i;

            pipe_rx_valid_q <= #TCQ pipe_rx_valid_i;

            pipe_rx_chanisaligned_q <= #TCQ pipe_rx_chanisaligned_i;

            pipe_rx_status_q <= #TCQ pipe_rx_status_i;

            pipe_rx_phy_status_q <= #TCQ pipe_rx_phy_status_i;

            pipe_rx_elec_idle_q <= #TCQ pipe_rx_elec_idle_i;

            pipe_rx_polarity_q <= #TCQ pipe_rx_polarity_i;

            pipe_tx_compliance_q <= #TCQ pipe_tx_compliance_i;

            pipe_tx_char_is_k_q <= #TCQ pipe_tx_char_is_k_i;

            pipe_tx_data_q <= #TCQ pipe_tx_data_i;

            pipe_tx_elec_idle_q <= #TCQ pipe_tx_elec_idle_i;

            pipe_tx_powerdown_q <= #TCQ pipe_tx_powerdown_i;

          end

        end

        assign pipe_rx_char_is_k_o = pipe_rx_char_is_k_q;

        assign pipe_rx_data_o = pipe_rx_data_q;

        assign pipe_rx_valid_o = pipe_rx_valid_q;

        assign pipe_rx_chanisaligned_o = pipe_rx_chanisaligned_q;

        assign pipe_rx_status_o = pipe_rx_status_q;

        assign pipe_rx_phy_status_o = pipe_rx_phy_status_q;

        assign pipe_rx_elec_idle_o = pipe_rx_elec_idle_q;

        assign pipe_rx_polarity_o = pipe_rx_polarity_q;

        assign pipe_tx_compliance_o = pipe_tx_compliance_q;

        assign pipe_tx_char_is_k_o = pipe_tx_char_is_k_q;

        assign pipe_tx_data_o = pipe_tx_data_q;

        assign pipe_tx_elec_idle_o = pipe_tx_elec_idle_q;

        assign pipe_tx_powerdown_o = pipe_tx_powerdown_q;

      end else if (PIPE_PIPELINE_STAGES == 2) begin

        always @(posedge pipe_clk) begin

          if (rst_n) begin

            pipe_rx_char_is_k_q <= #TCQ 0;

            pipe_rx_data_q <= #TCQ 0;

            pipe_rx_valid_q <= #TCQ 0;

            pipe_rx_chanisaligned_q <= #TCQ 0;

            pipe_rx_status_q <= #TCQ 0;

            pipe_rx_phy_status_q <= #TCQ 0;

            pipe_rx_elec_idle_q <= #TCQ 0;

            pipe_rx_polarity_q <= #TCQ 0;

            pipe_tx_compliance_q <= #TCQ 0;

            pipe_tx_char_is_k_q <= #TCQ 0;

            pipe_tx_data_q <= #TCQ 0;

            pipe_tx_elec_idle_q <= #TCQ 1'b1;

            pipe_tx_powerdown_q <= #TCQ 2'b10;

            pipe_rx_char_is_k_qq <= #TCQ 0;

            pipe_rx_data_qq <= #TCQ 0;

            pipe_rx_valid_qq <= #TCQ 0;

            pipe_rx_chanisaligned_qq <= #TCQ 0;

            pipe_rx_status_qq <= #TCQ 0;

            pipe_rx_phy_status_qq <= #TCQ 0;

            pipe_rx_elec_idle_qq <= #TCQ 0;

            pipe_rx_polarity_qq <= #TCQ 0;

            pipe_tx_compliance_qq <= #TCQ 0;

            pipe_tx_char_is_k_qq <= #TCQ 0;

            pipe_tx_data_qq <= #TCQ 0;

            pipe_tx_elec_idle_qq <= #TCQ 1'b1;

            pipe_tx_powerdown_qq <= #TCQ 2'b10;

          end else begin

            pipe_rx_char_is_k_q <= #TCQ pipe_rx_char_is_k_i;

            pipe_rx_data_q <= #TCQ pipe_rx_data_i;

            pipe_rx_valid_q <= #TCQ pipe_rx_valid_i;

            pipe_rx_chanisaligned_q <= #TCQ pipe_rx_chanisaligned_i;

            pipe_rx_status_q <= #TCQ pipe_rx_status_i;

            pipe_rx_phy_status_q <= #TCQ pipe_rx_phy_status_i;

            pipe_rx_elec_idle_q <= #TCQ pipe_rx_elec_idle_i;

            pipe_rx_polarity_q <= #TCQ pipe_rx_polarity_i;

            pipe_tx_compliance_q <= #TCQ pipe_tx_compliance_i;

            pipe_tx_char_is_k_q <= #TCQ pipe_tx_char_is_k_i;

            pipe_tx_data_q <= #TCQ pipe_tx_data_i;

            pipe_tx_elec_idle_q <= #TCQ pipe_tx_elec_idle_i;

            pipe_tx_powerdown_q <= #TCQ pipe_tx_powerdown_i;

            pipe_rx_char_is_k_qq <= #TCQ pipe_rx_char_is_k_q;

            pipe_rx_data_qq <= #TCQ pipe_rx_data_q;

            pipe_rx_valid_qq <= #TCQ pipe_rx_valid_q;

            pipe_rx_chanisaligned_qq <= #TCQ pipe_rx_chanisaligned_q;

            pipe_rx_status_qq <= #TCQ pipe_rx_status_q;

            pipe_rx_phy_status_qq <= #TCQ pipe_rx_phy_status_q;

            pipe_rx_elec_idle_qq <= #TCQ pipe_rx_elec_idle_q;

            pipe_rx_polarity_qq <= #TCQ pipe_rx_polarity_q;

            pipe_tx_compliance_qq <= #TCQ pipe_tx_compliance_q;

            pipe_tx_char_is_k_qq <= #TCQ pipe_tx_char_is_k_q;

            pipe_tx_data_qq <= #TCQ pipe_tx_data_q;

            pipe_tx_elec_idle_qq <= #TCQ pipe_tx_elec_idle_q;

            pipe_tx_powerdown_qq <= #TCQ pipe_tx_powerdown_q;

          end

        end

        assign pipe_rx_char_is_k_o = pipe_rx_char_is_k_qq;

        assign pipe_rx_data_o = pipe_rx_data_qq;

        assign pipe_rx_valid_o = pipe_rx_valid_qq;

        assign pipe_rx_chanisaligned_o = pipe_rx_chanisaligned_qq;

        assign pipe_rx_status_o = pipe_rx_status_qq;

        assign pipe_rx_phy_status_o = pipe_rx_phy_status_qq;

        assign pipe_rx_elec_idle_o = pipe_rx_elec_idle_qq;

        assign pipe_rx_polarity_o = pipe_rx_polarity_qq;

        assign pipe_tx_compliance_o = pipe_tx_compliance_qq;

        assign pipe_tx_char_is_k_o = pipe_tx_char_is_k_qq;

        assign pipe_tx_data_o = pipe_tx_data_qq;

        assign pipe_tx_elec_idle_o = pipe_tx_elec_idle_qq;

        assign pipe_tx_powerdown_o = pipe_tx_powerdown_qq;

      end

    endgenerate

endmodule