verilog/lm32/jtag_tap_spartan6.v

   1 /*
   2  * Milkymist SoC
   3  * Copyright (c) 2010 Michael Walle
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 module jtag_tap(
  30         output tck,
  31         output tdi,
  32         input tdo,
  33         output shift,
  34         output update,
  35         output reset
  36 );
  37
  38 wire g_shift;
  39 wire g_update;
  40
  41 assign shift = g_shift & sel;
  42 assign update = g_update & sel;
  43
  44 BSCAN_SPARTAN6 #(
  45         .JTAG_CHAIN(1)
  46 ) bscan (
  47         .CAPTURE(),
  48         .DRCK(tck),
  49         .RESET(reset),
  50         .RUNTEST(),
  51         .SEL(sel),
  52         .SHIFT(g_shift),
  53         .TCK(),
  54         .TDI(tdi),
  55         .TMS(),
  56         .UPDATE(g_update),
  57         .TDO(tdo)
  58 );
  59
  60 endmodule