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[/] [an-fpga-implementation-of-low-latency-noc-based-mpsoc/] [trunk/] [mpsoc/] [src_processor/] [new_lm32/] [rtl/] [jtag_cores.v] - Rev 48
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/* * LatticeMico32 * JTAG Registers * * Copyright (C) 2010 Michael Walle * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ module jtag_cores ( input [7:0] reg_d, input [2:0] reg_addr_d, output reg_update, output [7:0] reg_q, output [2:0] reg_addr_q, output jtck, output jrstn ); wire tck; wire tdi; wire tdo; wire shift; wire update; wire reset; jtag_tap jtag_tap ( .tck(tck), .tdi(tdi), .tdo(tdo), .shift(shift), .update(update), .reset(reset) ); reg [10:0] jtag_shift; reg [10:0] jtag_latched; always @(posedge tck or posedge reset) begin if(reset) jtag_shift <= 11'b0; else begin if(shift) jtag_shift <= {tdi, jtag_shift[10:1]}; else jtag_shift <= {reg_d, reg_addr_d}; end end assign tdo = jtag_shift[0]; always @(posedge reg_update or posedge reset) begin if(reset) jtag_latched <= 11'b0; else jtag_latched <= jtag_shift; end assign reg_update = update; assign reg_q = jtag_latched[10:3]; assign reg_addr_q = jtag_latched[2:0]; assign jtck = tck; assign jrstn = ~reset; endmodule