Subversion Repositories pcie_sg_dma

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

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

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

// File       : pcie_pipe_misc_v6.v

// Version    : 1.7

//--

//-- Description: Misc PIPE module for Virtex6 PCIe Block

//--

//--

//--

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

`timescale 1ns/1ns

module pcie_pipe_misc_v6 #

(

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

)

(

    input   wire        pipe_tx_rcvr_det_i       ,

    input   wire        pipe_tx_reset_i          ,

    input   wire        pipe_tx_rate_i           ,

    input   wire        pipe_tx_deemph_i         ,

    input   wire [2:0]  pipe_tx_margin_i         ,

    input   wire        pipe_tx_swing_i          ,

    output  wire        pipe_tx_rcvr_det_o       ,

    output  wire        pipe_tx_reset_o          ,

    output  wire        pipe_tx_rate_o           ,

    output  wire        pipe_tx_deemph_o         ,

    output  wire [2:0]  pipe_tx_margin_o         ,

    output  wire        pipe_tx_swing_o          ,

    input   wire        pipe_clk                ,

    input   wire        rst_n

);

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

// Reality check.                                                   //

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

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

    reg                pipe_tx_rcvr_det_q       ;

    reg                pipe_tx_reset_q          ;

    reg                pipe_tx_rate_q           ;

    reg                pipe_tx_deemph_q         ;

    reg [2:0]          pipe_tx_margin_q         ;

    reg                pipe_tx_swing_q          ;

    reg                pipe_tx_rcvr_det_qq      ;

    reg                pipe_tx_reset_qq         ;

    reg                pipe_tx_rate_qq          ;

    reg                pipe_tx_deemph_qq        ;

    reg [2:0]          pipe_tx_margin_qq        ;

    reg                pipe_tx_swing_qq         ;

    generate

      if (PIPE_PIPELINE_STAGES == 0) begin

        assign pipe_tx_rcvr_det_o = pipe_tx_rcvr_det_i;

        assign pipe_tx_reset_o  = pipe_tx_reset_i;

        assign pipe_tx_rate_o = pipe_tx_rate_i;

        assign pipe_tx_deemph_o = pipe_tx_deemph_i;

        assign pipe_tx_margin_o = pipe_tx_margin_i;

        assign pipe_tx_swing_o = pipe_tx_swing_i;

      end else if (PIPE_PIPELINE_STAGES == 1) begin

        always @(posedge pipe_clk) begin

          if (rst_n) begin

            pipe_tx_rcvr_det_q <= #TCQ 0;

            pipe_tx_reset_q  <= #TCQ 1'b1;

            pipe_tx_rate_q <= #TCQ 0;

            pipe_tx_deemph_q <= #TCQ 1'b1;

            pipe_tx_margin_q <= #TCQ 0;

            pipe_tx_swing_q <= #TCQ 0;

          end else begin

            pipe_tx_rcvr_det_q <= #TCQ pipe_tx_rcvr_det_i;

            pipe_tx_reset_q  <= #TCQ pipe_tx_reset_i;

            pipe_tx_rate_q <= #TCQ pipe_tx_rate_i;

            pipe_tx_deemph_q <= #TCQ pipe_tx_deemph_i;

            pipe_tx_margin_q <= #TCQ pipe_tx_margin_i;

            pipe_tx_swing_q <= #TCQ pipe_tx_swing_i;

          end

        end

        assign pipe_tx_rcvr_det_o = pipe_tx_rcvr_det_q;

        assign pipe_tx_reset_o  = pipe_tx_reset_q;

        assign pipe_tx_rate_o = pipe_tx_rate_q;

        assign pipe_tx_deemph_o = pipe_tx_deemph_q;

        assign pipe_tx_margin_o = pipe_tx_margin_q;

        assign pipe_tx_swing_o = pipe_tx_swing_q;

      end else if (PIPE_PIPELINE_STAGES == 2) begin

        always @(posedge pipe_clk) begin

          if (rst_n) begin

            pipe_tx_rcvr_det_q <= #TCQ 0;

            pipe_tx_reset_q  <= #TCQ 1'b1;

            pipe_tx_rate_q <= #TCQ 0;

            pipe_tx_deemph_q <= #TCQ 1'b1;

            pipe_tx_margin_q <= #TCQ 0;

            pipe_tx_swing_q <= #TCQ 0;

            pipe_tx_rcvr_det_qq <= #TCQ 0;

            pipe_tx_reset_qq  <= #TCQ 1'b1;

            pipe_tx_rate_qq <= #TCQ 0;

            pipe_tx_deemph_qq <= #TCQ 1'b1;

            pipe_tx_margin_qq <= #TCQ 0;

            pipe_tx_swing_qq <= #TCQ 0;

          end else begin

            pipe_tx_rcvr_det_q <= #TCQ pipe_tx_rcvr_det_i;

            pipe_tx_reset_q  <= #TCQ pipe_tx_reset_i;

            pipe_tx_rate_q <= #TCQ pipe_tx_rate_i;

            pipe_tx_deemph_q <= #TCQ pipe_tx_deemph_i;

            pipe_tx_margin_q <= #TCQ pipe_tx_margin_i;

            pipe_tx_swing_q <= #TCQ pipe_tx_swing_i;

            pipe_tx_rcvr_det_qq <= #TCQ pipe_tx_rcvr_det_q;

            pipe_tx_reset_qq  <= #TCQ pipe_tx_reset_q;

            pipe_tx_rate_qq <= #TCQ pipe_tx_rate_q;

            pipe_tx_deemph_qq <= #TCQ pipe_tx_deemph_q;

            pipe_tx_margin_qq <= #TCQ pipe_tx_margin_q;

            pipe_tx_swing_qq <= #TCQ pipe_tx_swing_q;

          end

        end

        assign pipe_tx_rcvr_det_o = pipe_tx_rcvr_det_qq;

        assign pipe_tx_reset_o  = pipe_tx_reset_qq;

        assign pipe_tx_rate_o = pipe_tx_rate_qq;

        assign pipe_tx_deemph_o = pipe_tx_deemph_qq;

        assign pipe_tx_margin_o = pipe_tx_margin_qq;

        assign pipe_tx_swing_o = pipe_tx_swing_qq;

      end

    endgenerate

endmodule