Subversion Repositories bustap-jtag

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

// Module             : virtual_jtag_adda_trig.v

// Platform           : Windows xp sp2

// Simulator          : Modelsim 6.5b

// Synthesizer        : QuartusII 10.1 sp1

// Place and Route    : QuartusII 10.1 sp1

// Targets device     : Cyclone III

// Author             : Bibo Yang  (ash_riple@hotmail.com)

// Organization       : www.opencores.org

// Revision           : 2.0 

// Date               : 2012/03/12

// Description        : addr/data trigger input from debug host

//                      via Virtual JTAG.

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

`timescale 1ns/1ns

module virtual_jtag_adda_trig(trig_out);

parameter trig_width  = 32;

output [trig_width-1:0] trig_out;

reg [trig_width-1:0] trig_out;

wire tdi, tck, cdr, cir, e1dr, e2dr, pdr, sdr, udr, uir;

reg  tdo;

reg  [trig_width-1:0] trig_instr_reg;

reg  bypass_reg;

wire [1:0] ir_in;

wire trig_instr = ~ir_in[1] &  ir_in[0]; // 1

always @(posedge tck)

begin

  if (trig_instr && e1dr)

    trig_out <= trig_instr_reg;

end

/* trig_instr Instruction Handler */

always @ (posedge tck)

  if ( trig_instr && cdr )

    trig_instr_reg <= trig_instr_reg;

  else if ( trig_instr && sdr )

    trig_instr_reg <= {tdi, trig_instr_reg[trig_width-1:1]};

/* Bypass register */

always @ (posedge tck)

  bypass_reg <= tdi;

/* Node TDO Output */

always @ ( trig_instr, trig_instr_reg, bypass_reg )

begin

  if (trig_instr)

    tdo <= trig_instr_reg[0];

  else

    tdo <= bypass_reg;// Used to maintain the continuity of the scan chain.

end

sld_virtual_jtag        sld_virtual_jtag_component (

                                .ir_in (ir_in),

                                .ir_out (2'b0),

                                .tdo (tdo),

                                .tdi (tdi),

                                .tms (),

                                .tck (tck),

                                .virtual_state_cir (cir),

                                .virtual_state_pdr (pdr),

                                .virtual_state_uir (uir),

                                .virtual_state_sdr (sdr),

                                .virtual_state_cdr (cdr),

                                .virtual_state_udr (udr),

                                .virtual_state_e1dr (e1dr),

                                .virtual_state_e2dr (e2dr),

                                .jtag_state_rti (),

                                .jtag_state_e1dr (),

                                .jtag_state_e2dr (),

                                .jtag_state_pir (),

                                .jtag_state_tlr (),

                                .jtag_state_sir (),

                                .jtag_state_cir (),

                                .jtag_state_uir (),

                                .jtag_state_pdr (),

                                .jtag_state_sdrs (),

                                .jtag_state_sdr (),

                                .jtag_state_cdr (),

                                .jtag_state_udr (),

                                .jtag_state_sirs (),

                                .jtag_state_e1ir (),

                                .jtag_state_e2ir ());

        defparam

                sld_virtual_jtag_component.sld_auto_instance_index = "NO",

                sld_virtual_jtag_component.sld_instance_index = 2,

                sld_virtual_jtag_component.sld_ir_width = 2,

                sld_virtual_jtag_component.sld_sim_action = "((1,1,1,2))",

                sld_virtual_jtag_component.sld_sim_n_scan = 1,

                sld_virtual_jtag_component.sld_sim_total_length = 2;

endmodule