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////  xilinx_internal_jtag.v                                      ////

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////                                                              ////

////                                                              ////

////  Author(s):                                                  ////

////       Nathan Yawn (nathan.yawn@opencores.org)                ////

////                                                              ////

////                                                              ////

////                                                              ////

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////                                                              ////

//// Copyright (C) 2008 Authors                                   ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source is distributed in the hope that it will be       ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

//// PURPOSE.  See the GNU Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//                                                                  //

// This file is a wrapper for the various Xilinx internal BSCAN     //

// TAP devices.  It is designed to take the place of a separate TAP //

// controller in Xilinx systems, to allow a user to access a CPU    //

// debug module (such as that of the OR1200) through the FPGA's     //

// dedicated JTAG / configuration port.                             //

//                                                                  //

//////////////////////////////////////////////////////////////////////

//

// CVS Revision History

//

// $Log: xilinx_internal_jtag.v,v $

// Revision 1.4  2009-12-28 01:15:28  Nathan

// Removed incorrect duplicate assignment of capture_dr_o in SPARTAN2 TAP, per bug report from Raul Fajardo.

//

// Revision 1.3  2009/06/16 02:54:23  Nathan

// Changed some signal names for better consistency between different hardware modules.

//

// Revision 1.2  2009/05/17 20:54:16  Nathan

// Changed email address to opencores.org

//

// Revision 1.1  2008/07/18 20:07:32  Nathan

// Changed the directory structure to match existing projects.

//

// Revision 1.4  2008/07/11 08:26:10  Nathan

// Ran through dos2unix

//

// Revision 1.3  2008/07/11 08:25:52  Nathan

// Added logic to provide CAPTURE_DR signal when necessary, and to provide a TCK while UPDATE_DR is asserted.  Note that there is no TCK event between SHIFT_DR and UPDATE_DR, and no TCK event between UPDATE_DR and the next CAPTURE_DR; the Xilinx BSCAN devices do not provide it.  Tested successfully with the adv_dbg_if on Virtex-4.

//

// Revision 1.2  2008/06/09 19:34:14  Nathan

// Syntax and functional fixes made after compiling each type of BSCAN module using Xilinx tools.

//

// Revision 1.1  2008/05/22 19:54:07  Nathan

// Initial version

//

`include "xilinx_internal_jtag_options.v"

// Note that the SPARTAN BSCAN controllers have more than one channel.

// This implementation always uses channel 1, this is not configurable.

// If you want to use another channel, then it is probably because you

// want to attach multiple devices to the BSCAN device, which means

// you'll be making changes to this file anyway.

// Virtex BSCAN devices are instantiated separately for each channel.

// To select something other than the default (1), change the parameter

// "virtex_jtag_chain".

module xilinx_internal_jtag (

        tck_o,

        debug_tdo_i,

        tdi_o,

        test_logic_reset_o,

        run_test_idle_o,

        shift_dr_o,

        capture_dr_o,

        pause_dr_o,

        update_dr_o,

        debug_select_o

);

// May be 1, 2, 3, or 4

// Only used for Virtex 4/5 devices

parameter virtex_jtag_chain = 1;

input debug_tdo_i;

output tck_o;

output tdi_o;

output test_logic_reset_o;

output run_test_idle_o;

output shift_dr_o;

output capture_dr_o;

output pause_dr_o;

output update_dr_o;

output debug_select_o;

wire debug_tdo_i;

wire tck_o;

wire drck;

wire tdi_o;

wire test_logic_reset_o;

wire run_test_idle_o;

wire shift_dr_o;

wire pause_dr_o;

wire update_dr_o;

wire debug_select_o;

`ifdef SPARTAN2

// Note that this version is missing three outputs.

// It also does not have a real TCK...DRCK1 is only active when USER1 is selected

// AND the TAP is in SHIFT_DR or CAPTURE_DR states...except there's no

// capture_dr output. 

reg capture_dr_o;

wire update_bscan;

reg update_out;

BSCAN_SPARTAN2 BSCAN_SPARTAN2_inst (

.DRCK1(drck), // Data register output for USER1 functions

.DRCK2(), // Data register output for USER2 functions

.RESET(test_logic_reset_o), // Reset output from TAP controller

.SEL1(debug_select_o), // USER1 active output

.SEL2(), // USER2 active output

.SHIFT(shift_dr_o), // SHIFT output from TAP controller

.TDI(tdi_o), // TDI output from TAP controller

.UPDATE(update_bscan), // UPDATE output from TAP controller

.TDO1(debug_tdo_i), // Data input for USER1 function

.TDO2( 1'b0 ) // Data input for USER2 function

);

assign pause_dr_o = 1'b0;

assign run_test_idle_o = 1'b0;

// We get one TCK during capture_dr state (low,high,SHIFT goes high on next DRCK high)

// On that negative edge, set capture_dr, and it will get registered on the rising

// edge.

always @ (negedge tck_o)

begin

        if(debug_select_o && !shift_dr_o)

                capture_dr_o <= 1'b1;

        else

                capture_dr_o <= 1'b0;

end

// The & !update_bscan tern will provide a clock edge so update_dr_o can be registered

// The &debug_select term will drop TCK when the module is un-selected (does not happen in the BSCAN block).

// This allows a user to kludge clock ticks in the IDLE state, which is needed by the advanced debug module.

assign tck_o = (drck & debug_select_o & !update_bscan);

// This will hold the update_dr output so it can be registered on the rising edge

// of the clock created above.

always @(posedge update_bscan or posedge capture_dr_o or negedge debug_select_o)

begin

        if(update_bscan) update_out <= 1'b1;

        else if(capture_dr_o) update_out <= 1'b0;

        else if(!debug_select_o) update_out <= 1'b0;

end

assign update_dr_o = update_out;

`else

`ifdef SPARTAN3

// Note that this version is missing two outputs.

// It also does not have a real TCK...DRCK1 is only active when USER1 is selected.

wire capture_dr_o;

wire update_bscan;

reg update_out;

BSCAN_SPARTAN3 BSCAN_SPARTAN3_inst (

.CAPTURE(capture_dr_o), // CAPTURE output from TAP controller

.DRCK1(drck), // Data register output for USER1 functions

.DRCK2(), // Data register output for USER2 functions

.RESET(test_logic_reset_o), // Reset output from TAP controller

.SEL1(debug_select_o), // USER1 active output

.SEL2(), // USER2 active output

.SHIFT(shift_dr_o), // SHIFT output from TAP controller

.TDI(tdi_o), // TDI output from TAP controller

.UPDATE(update_bscan), // UPDATE output from TAP controller

.TDO1(debug_tdo_i), // Data input for USER1 function

.TDO2(1'b0) // Data input for USER2 function

);

assign pause_dr_o = 1'b0;

assign run_test_idle_o = 1'b0;

// The & !update_bscan tern will provide a clock edge so update_dr_o can be registered

// The &debug_select term will drop TCK when the module is un-selected (does not happen in the BSCAN block).

// This allows a user to kludge clock ticks in the IDLE state, which is needed by the advanced debug module.

assign tck_o = (drck & debug_select_o & !update_bscan);

// This will hold the update_dr output so it can be registered on the rising edge

// of the clock created above.

always @(posedge update_bscan or posedge capture_dr_o or negedge debug_select_o)

begin

        if(update_bscan) update_out <= 1'b1;

        else if(capture_dr_o) update_out <= 1'b0;

        else if(!debug_select_o) update_out <= 1'b0;

end

assign update_dr_o = update_out;

`else

`ifdef SPARTAN3A

// Note that this version is missing two outputs.

// At least it has a real TCK.

wire capture_dr_o;

BSCAN_SPARTAN3A BSCAN_SPARTAN3A_inst (

.CAPTURE(capture_dr_o), // CAPTURE output from TAP controller

.DRCK1(), // Data register output for USER1 functions

.DRCK2(), // Data register output for USER2 functions

.RESET(test_logic_reset_o), // Reset output from TAP controller

.SEL1(debug_select_o), // USER1 active output

.SEL2(), // USER2 active output

.SHIFT(shift_dr_o), // SHIFT output from TAP controller

.TCK(tck_o), // TCK output from TAP controller

.TDI(tdi_o), // TDI output from TAP controller

.TMS(), // TMS output from TAP controller

.UPDATE(update_dr_o), // UPDATE output from TAP controller

.TDO1(debug_tdo_i), // Data input for USER1 function

.TDO2( 1'b0) // Data input for USER2 function

);

assign pause_dr_o = 1'b0;

assign run_test_idle_o = 1'b0;

`else

`ifdef VIRTEX

// Note that this version is missing three outputs.

// It also does not have a real TCK...DRCK1 is only active when USER1 is selected.

reg capture_dr_o;

wire update_bscan;

reg update_out;

BSCAN_VIRTEX BSCAN_VIRTEX_inst (

.DRCK1(drck), // Data register output for USER1 functions

.DRCK2(), // Data register output for USER2 functions

.RESET(test_logic_reset_o), // Reset output from TAP controller

.SEL1(debug_select_o), // USER1 active output

.SEL2(), // USER2 active output

.SHIFT(shift_dr_o), // SHIFT output from TAP controller

.TDI(tdi_o), // TDI output from TAP controller

.UPDATE(update_bscan), // UPDATE output from TAP controller

.TDO1(debug_tdo_i), // Data input for USER1 function

.TDO2( 1'b0) // Data input for USER2 function

);

assign pause_dr_o = 1'b0;

assign run_test_idle_o = 1'b0;

// We get one TCK during capture_dr state (low,high,SHIFT goes high on next DRCK low)

// On that negative edge, set capture_dr, and it will get registered on the rising

// edge, then de-asserted on the same edge that SHIFT goes high.

always @ (negedge tck_o)

begin

        if(debug_select_o && !shift_dr_o)

                capture_dr_o <= 1'b1;

        else

                capture_dr_o <= 1'b0;

end

// The & !update_bscan tern will provide a clock edge so update_dr_o can be registered

// The &debug_select term will drop TCK when the module is un-selected (does not happen in the BSCAN block).

// This allows a user to kludge clock ticks in the IDLE state, which is needed by the advanced debug module.

assign tck_o = (drck & debug_select_o & !update_bscan);

// This will hold the update_dr output so it can be registered on the rising edge

// of the clock created above.

always @(posedge update_bscan or posedge capture_dr_o or negedge debug_select_o)

begin

        if(update_bscan) update_out <= 1'b1;

        else if(capture_dr_o) update_out <= 1'b0;

        else if(!debug_select_o) update_out <= 1'b0;

end

assign update_dr_o = update_out;

`else

`ifdef VIRTEX2

// Note that this version is missing two outputs.

// It also does not have a real TCK...DRCK1 is only active when USER1 is selected.

wire capture_dr_o;

wire update_bscan;

reg update_out;

BSCAN_VIRTEX2 BSCAN_VIRTEX2_inst (

.CAPTURE(capture_dr_o), // CAPTURE output from TAP controller

.DRCK1(drck), // Data register output for USER1 functions

.DRCK2(), // Data register output for USER2 functions

.RESET(test_logic_reset_o), // Reset output from TAP controller

.SEL1(debug_select_o), // USER1 active output

.SEL2(), // USER2 active output

.SHIFT(shift_dr_o), // SHIFT output from TAP controller

.TDI(tdi_o), // TDI output from TAP controller

.UPDATE(update_bscan), // UPDATE output from TAP controller

.TDO1(debug_tdo_i), // Data input for USER1 function

.TDO2( 1'b0 ) // Data input for USER2 function

);

assign pause_dr_o = 1'b0;

assign run_test_idle_o = 1'b0;

// The & !update_bscan tern will provide a clock edge so update_dr_o can be registered

// The &debug_select term will drop TCK when the module is un-selected (does not happen in the BSCAN block).

// This allows a user to kludge clock ticks in the IDLE state, which is needed by the advanced debug module.

assign tck_o = (drck & debug_select_o & !update_bscan);

// This will hold the update_dr output so it can be registered on the rising edge

// of the clock created above.

always @(posedge update_bscan or posedge capture_dr_o or negedge debug_select_o)

begin

        if(update_bscan) update_out <= 1'b1;

        else if(capture_dr_o) update_out <= 1'b0;

        else if(!debug_select_o) update_out <= 1'b0;

end

assign update_dr_o = update_out;

`else

`ifdef VIRTEX4

// Note that this version is missing two outputs.

// It also does not have a real TCK...DRCK is only active when USERn is selected.

wire capture_dr_o;

wire update_bscan;

reg update_out;

BSCAN_VIRTEX4 #(

.JTAG_CHAIN(virtex_jtag_chain)

) BSCAN_VIRTEX4_inst (

.CAPTURE(capture_dr_o), // CAPTURE output from TAP controller

.DRCK(drck), // Data register output for USER function

.RESET(test_logic_reset_o), // Reset output from TAP controller

.SEL(debug_select_o), // USER active output

.SHIFT(shift_dr_o), // SHIFT output from TAP controller

.TDI(tdi_o), // TDI output from TAP controller

.UPDATE(update_bscan), // UPDATE output from TAP controller

.TDO( debug_tdo_i ) // Data input for USER function

);

assign pause_dr_o = 1'b0;

assign run_test_idle_o = 1'b0;

// The & !update_bscan tern will provide a clock edge so update_dr_o can be registered

// The &debug_select term will drop TCK when the module is un-selected (does not happen in the BSCAN block).

// This allows a user to kludge clock ticks in the IDLE state, which is needed by the advanced debug module.

assign tck_o = (drck & debug_select_o & !update_bscan);

// This will hold the update_dr output so it can be registered on the rising edge

// of the clock created above.

always @(posedge update_bscan or posedge capture_dr_o or negedge debug_select_o)

begin

        if(update_bscan) update_out <= 1'b1;

        else if(capture_dr_o) update_out <= 1'b0;

        else if(!debug_select_o) update_out <= 1'b0;

end

assign update_dr_o = update_out;

`else

`ifdef VIRTEX5

// Note that this version is missing two outputs.

// It also does not have a real TCK...DRCK is only active when USERn is selected.

wire capture_dr_o;

wire update_bscan;

reg update_out;

BSCAN_VIRTEX5 #(

.JTAG_CHAIN(virtex_jtag_chain)

) BSCAN_VIRTEX5_inst (

.CAPTURE(capture_dr_o), // CAPTURE output from TAP controller

.DRCK(drck), // Data register output for USER function

.RESET(test_logic_reset), // Reset output from TAP controller

.SEL(debug_select_o), // USER active output

.SHIFT(shift_dr_o), // SHIFT output from TAP controller

.TDI(tdi_o), // TDI output from TAP controller

.UPDATE(update_bscan), // UPDATE output from TAP controller

.TDO(debug_tdo_i) // Data input for USER function

);

assign pause_dr_o = 1'b0;

assign run_test_idle_o = 1'b0;

// The & !update_bscan tern will provide a clock edge so update_dr_o can be registered

// The &debug_select term will drop TCK when the module is un-selected (does not happen in the BSCAN block).

// This allows a user to kludge clock ticks in the IDLE state, which is needed by the advanced debug module.

assign tck_o = (drck & debug_select_o & !update_bscan);

// This will hold the update_dr output so it can be registered on the rising edge

// of the clock created above.

always @(posedge update_bscan or posedge capture_dr_o or negedge debug_select_o)

begin

        if(update_bscan) update_out <= 1'b1;

        else if(capture_dr_o) update_out <= 1'b0;

        else if(!debug_select_o) update_out <= 1'b0;

end

assign update_dr_o = update_out;

`endif

`endif

`endif

`endif

`endif

`endif

`endif

endmodule