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// $Header: /home/marcus/revision_ctrl_test/oc_cvs/cvs/or1k/mp3/lib/xilinx/unisims/BUFGMUX.v,v 1.1.1.1 2001-11-04 18:59:46 lampret Exp $

/*

FUNCTION        : Global Clock Mux Buffer

*/

`timescale  100 ps / 10 ps

module BUFGMUX (O, I0, I1, S);

    parameter cds_action = "ignore";

    output O;

    input  I0, I1, S;

    reg q0, q1;

    reg q0_enable, q1_enable;

    tri0 GSR = glbl.GSR;

    bufif1 B0 (O, I0, q0);

    bufif1 B1 (O, I1, q1);

    pulldown P1 (O);

        always @(GSR or I0 or S or q0_enable)

            if (GSR)

                q0 <= 1;

            else if (!I0)

                q0 <= !S && q0_enable;

        always @(GSR or I1 or S or q1_enable)

            if (GSR)

                q1 <= 0;

            else if (!I1)

                q1 <= S && q1_enable;

        always @(GSR)

            if (GSR) begin

                assign q0_enable = 1;

                assign q1_enable = 0;

            end

            else begin

                deassign q0_enable;

                deassign q1_enable;

            end

        always @(posedge q1 or negedge I0)

            if (q1)

                q0_enable <= 0;

            else

                q0_enable <= !q1;

        always @(posedge q0 or negedge I1)

            if (q0)

                q1_enable <= 0;

            else

                q1_enable <= !q0;

    specify

    endspecify

endmodule