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//----------------------------------------------------------------------------
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//----------------------------------------------------------------------------
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// Copyright (C) 2001 Authors
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// Copyright (C) 2009 , Olivier Girard
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//
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//
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// This source file may be used and distributed without restriction provided
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// Redistribution and use in source and binary forms, with or without
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// that this copyright statement is not removed from the file and that any
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// modification, are permitted provided that the following conditions
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// derivative work contains the original copyright notice and the associated
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// are met:
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// disclaimer.
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// * Redistributions of source code must retain the above copyright
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//
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// notice, this list of conditions and the following disclaimer.
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// This source file is free software; you can redistribute it and/or modify
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// * Redistributions in binary form must reproduce the above copyright
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// it under the terms of the GNU Lesser General Public License as published
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// notice, this list of conditions and the following disclaimer in the
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// by the Free Software Foundation; either version 2.1 of the License, or
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// documentation and/or other materials provided with the distribution.
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// (at your option) any later version.
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// * Neither the name of the authors nor the names of its contributors
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//
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// may be used to endorse or promote products derived from this software
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// This source is distributed in the hope that it will be useful, but WITHOUT
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// without specific prior written permission.
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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//
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// License for more details.
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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//
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// You should have received a copy of the GNU Lesser General Public License
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// along with this source; if not, write to the Free Software Foundation,
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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// OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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// THE POSSIBILITY OF SUCH DAMAGE
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//
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//
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//----------------------------------------------------------------------------
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//----------------------------------------------------------------------------
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//
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//
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// *File Name: omsp_mem_backbone.v
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// *File Name: omsp_mem_backbone.v
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//
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//
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fe_mab, // Frontend Memory address bus
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fe_mab, // Frontend Memory address bus
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fe_mb_en, // Frontend Memory bus enable
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fe_mb_en, // Frontend Memory bus enable
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mclk, // Main system clock
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mclk, // Main system clock
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per_dout, // Peripheral data output
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per_dout, // Peripheral data output
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pmem_dout, // Program Memory data output
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pmem_dout, // Program Memory data output
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puc_rst // Main system reset
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puc_rst, // Main system reset
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scan_enable // Scan enable (active during scan shifting)
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);
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);
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// OUTPUTs
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// OUTPUTs
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//=========
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//=========
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output [15:0] dbg_mem_din; // Debug unit Memory data input
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output [15:0] dbg_mem_din; // Debug unit Memory data input
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input fe_mb_en; // Frontend Memory bus enable
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input fe_mb_en; // Frontend Memory bus enable
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input mclk; // Main system clock
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input mclk; // Main system clock
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input [15:0] per_dout; // Peripheral data output
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input [15:0] per_dout; // Peripheral data output
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input [15:0] pmem_dout; // Program Memory data output
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input [15:0] pmem_dout; // Program Memory data output
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input puc_rst; // Main system reset
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input puc_rst; // Main system reset
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input scan_enable; // Scan enable (active during scan shifting)
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//=============================================================================
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//=============================================================================
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// 1) DECODER
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// 1) DECODER
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//=============================================================================
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//=============================================================================
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else fe_pmem_cen_dly <= fe_pmem_cen;
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else fe_pmem_cen_dly <= fe_pmem_cen;
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wire fe_pmem_save = ( fe_pmem_cen & ~fe_pmem_cen_dly) & ~dbg_halt_st;
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wire fe_pmem_save = ( fe_pmem_cen & ~fe_pmem_cen_dly) & ~dbg_halt_st;
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wire fe_pmem_restore = (~fe_pmem_cen & fe_pmem_cen_dly) | dbg_halt_st;
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wire fe_pmem_restore = (~fe_pmem_cen & fe_pmem_cen_dly) | dbg_halt_st;
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`ifdef CLOCK_GATING
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wire mclk_bckup;
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omsp_clock_gate clock_gate_bckup (.gclk(mclk_bckup),
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.clk (mclk), .enable(fe_pmem_save), .scan_enable(scan_enable));
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`else
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wire mclk_bckup = mclk;
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`endif
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reg [15:0] pmem_dout_bckup;
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reg [15:0] pmem_dout_bckup;
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always @(posedge mclk or posedge puc_rst)
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always @(posedge mclk_bckup or posedge puc_rst)
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if (puc_rst) pmem_dout_bckup <= 16'h0000;
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if (puc_rst) pmem_dout_bckup <= 16'h0000;
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`ifdef CLOCK_GATING
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else pmem_dout_bckup <= pmem_dout;
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`else
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else if (fe_pmem_save) pmem_dout_bckup <= pmem_dout;
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else if (fe_pmem_save) pmem_dout_bckup <= pmem_dout;
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`endif
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// Mux between the ROM data and the backup
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// Mux between the ROM data and the backup
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reg pmem_dout_bckup_sel;
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reg pmem_dout_bckup_sel;
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always @(posedge mclk or posedge puc_rst)
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always @(posedge mclk or posedge puc_rst)
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if (puc_rst) pmem_dout_bckup_sel <= 1'b0;
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if (puc_rst) pmem_dout_bckup_sel <= 1'b0;
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