Subversion Repositories bustap-jtag

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

// Module             : virtual_jtag_addr_mask.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 mask input from debug host via

//                      Virtual JTAG.

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

`timescale 1ns/1ns

module virtual_jtag_addr_mask(mask_out0 ,mask_out1 ,mask_out2 ,mask_out3 ,

                              mask_out4 ,mask_out5 ,mask_out6 ,mask_out7 ,

                              mask_out8 ,mask_out9 ,mask_out10,mask_out11,

                              mask_out12,mask_out13,mask_out14,mask_out15

                             );

parameter addr_width  = 32,

          mask_index  = 4, //2**mask_index=mask_num

          mask_num    = 16;

output [addr_width-1:0] mask_out0;

output [addr_width-1:0] mask_out1;

output [addr_width-1:0] mask_out2;

output [addr_width-1:0] mask_out3;

output [addr_width-1:0] mask_out4;

output [addr_width-1:0] mask_out5;

output [addr_width-1:0] mask_out6;

output [addr_width-1:0] mask_out7;

output [addr_width-1:0] mask_out8;

output [addr_width-1:0] mask_out9;

output [addr_width-1:0] mask_out10;

output [addr_width-1:0] mask_out11;

output [addr_width-1:0] mask_out12;

output [addr_width-1:0] mask_out13;

output [addr_width-1:0] mask_out14;

output [addr_width-1:0] mask_out15;

reg [addr_width-1:0] mask_out0;

reg [addr_width-1:0] mask_out1;

reg [addr_width-1:0] mask_out2;

reg [addr_width-1:0] mask_out3;

reg [addr_width-1:0] mask_out4;

reg [addr_width-1:0] mask_out5;

reg [addr_width-1:0] mask_out6;

reg [addr_width-1:0] mask_out7;

reg [addr_width-1:0] mask_out8;

reg [addr_width-1:0] mask_out9;

reg [addr_width-1:0] mask_out10;

reg [addr_width-1:0] mask_out11;

reg [addr_width-1:0] mask_out12;

reg [addr_width-1:0] mask_out13;

reg [addr_width-1:0] mask_out14;

reg [addr_width-1:0] mask_out15;

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

reg  tdo;

reg  [mask_index+addr_width-1:0] mask_instr_reg;

reg  bypass_reg;

wire [1:0] ir_in;

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

wire [mask_index-1:0] mask_id = mask_instr_reg[(mask_index+addr_width-1):addr_width];

wire [addr_width-1:0] mask_is = mask_instr_reg[(addr_width-1):0];

always @(posedge tck)

begin

  if (mask_instr && e1dr)

        case (mask_id)

                4'd0 :

                        mask_out0 <= mask_is;

                4'd1 :

                        mask_out1 <= mask_is;

                4'd2 :

                        mask_out2 <= mask_is;

                4'd3 :

                        mask_out3 <= mask_is;

                4'd4 :

                        mask_out4 <= mask_is;

                4'd5 :

                        mask_out5 <= mask_is;

                4'd6 :

                        mask_out6 <= mask_is;

                4'd7 :

                        mask_out7 <= mask_is;

                4'd8 :

                        mask_out8 <= mask_is;

                4'd9 :

                        mask_out9 <= mask_is;

                4'd10 :

                        mask_out10 <= mask_is;

                4'd11 :

                        mask_out11 <= mask_is;

                4'd12 :

                        mask_out12 <= mask_is;

                4'd13 :

                        mask_out13 <= mask_is;

                4'd14 :

                        mask_out14 <= mask_is;

                4'd15 :

                        mask_out15 <= mask_is;

        endcase

end

/* mask_instr Instruction Handler */

always @ (posedge tck)

  if ( mask_instr && cdr )

    mask_instr_reg <= mask_instr_reg;

  else if ( mask_instr && sdr )

    mask_instr_reg <= {tdi, mask_instr_reg[mask_index+addr_width-1:1]};

/* Bypass register */

always @ (posedge tck)

  bypass_reg = tdi;

/* Node TDO Output */

always @ ( mask_instr, mask_instr_reg, bypass_reg )

begin

  if (mask_instr)

    tdo <= mask_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 = 1,

                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