///////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////
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//
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//
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// Filename: memdev.v
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// Filename: memdev.v
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//
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//
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// Project: XuLA2 board
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// Project: XuLA2 board
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//
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//
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// Purpose: This file is really simple: it creates an on-chip memory,
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// Purpose: This file is really simple: it creates an on-chip memory,
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// accessible via the wishbone bus, that can be used in this
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// accessible via the wishbone bus, that can be used in this
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// project. The memory has single cycle access--although getting to the
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// project. The memory has single cycle access--although getting to the
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// memory from the ZipCPU may cost another cycle or two in access. Either
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// memory from the ZipCPU may cost another cycle or two in access. Either
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// way, operations can be pipelined for greater speed.
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// way, operations can be pipelined for greater speed.
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//
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//
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//
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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// Gisselquist Technology, LLC
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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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// Copyright (C) 2015, Gisselquist Technology, LLC
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// Copyright (C) 2015-2016, Gisselquist Technology, LLC
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//
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//
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// This program is free software (firmware): you can redistribute it and/or
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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// your option) any later version.
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//
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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// for more details.
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//
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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// http://www.gnu.org/licenses/gpl.html
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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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//
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//
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//
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//
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module memdev(i_clk, i_wb_cyc, i_wb_stb, i_wb_we, i_wb_addr, i_wb_data,
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module memdev(i_clk, i_wb_cyc, i_wb_stb, i_wb_we, i_wb_addr, i_wb_data,
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o_wb_ack, o_wb_stall, o_wb_data);
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o_wb_ack, o_wb_stall, o_wb_data);
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parameter AW=15, DW=32;
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parameter AW=15, DW=32;
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input i_clk, i_wb_cyc, i_wb_stb, i_wb_we;
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input i_clk, i_wb_cyc, i_wb_stb, i_wb_we;
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input [(AW-1):0] i_wb_addr;
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input [(AW-1):0] i_wb_addr;
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input [(DW-1):0] i_wb_data;
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input [(DW-1):0] i_wb_data;
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output reg o_wb_ack;
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output reg o_wb_ack;
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output wire o_wb_stall;
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output wire o_wb_stall;
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output reg [(DW-1):0] o_wb_data;
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output reg [(DW-1):0] o_wb_data;
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reg [(DW-1):0] mem [0:((1<<AW)-1)];
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reg [(DW-1):0] mem [0:((1<<AW)-1)];
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always @(posedge i_clk)
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always @(posedge i_clk)
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o_wb_data <= mem[i_wb_addr];
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o_wb_data <= mem[i_wb_addr];
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always @(posedge i_clk)
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always @(posedge i_clk)
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if ((i_wb_cyc)&&(i_wb_stb)&&(i_wb_we))
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if ((i_wb_cyc)&&(i_wb_stb)&&(i_wb_we))
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mem[i_wb_addr] <= i_wb_data;
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mem[i_wb_addr] <= i_wb_data;
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always @(posedge i_clk)
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always @(posedge i_clk)
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o_wb_ack <= (i_wb_cyc)&&(i_wb_stb);
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o_wb_ack <= (i_wb_cyc)&&(i_wb_stb);
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assign o_wb_stall = 1'b0;
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assign o_wb_stall = 1'b0;
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endmodule
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endmodule
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