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///////////////////////////////////////////////////////////////////////////
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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: CMod S6 System on a Chip, ZipCPU demonstration Project
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// Project: CMod S6 System on a Chip, ZipCPU demonstration Project
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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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// 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) 2015-2016, Gisselquist Technology, LLC
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// Copyright (C) 2015-2017, 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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// 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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// You should have received a copy of the GNU General Public License along
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// with this program. (It's in the $(ROOT)/doc directory, run make with no
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// target there if the PDF file isn't present.) If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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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, i_wb_sel,
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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 LGMEMSZ=15, DW=32, EXTRACLOCK= 0;
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localparam AW = LGMEMSZ - 2;
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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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input [(DW/8-1):0] i_wb_sel;
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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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wire w_wstb, w_stb;
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wire [(DW-1):0] w_data;
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wire [(AW-1):0] w_addr;
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wire [(DW/8-1):0] w_sel;
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generate
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if (EXTRACLOCK == 0)
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begin
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assign w_wstb = (i_wb_stb)&&(i_wb_we);
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assign w_stb = i_wb_stb;
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assign w_addr = i_wb_addr;
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assign w_data = i_wb_data;
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assign w_sel = i_wb_sel;
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end else begin
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reg last_wstb, last_stb;
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always @(posedge i_clk)
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last_wstb <= (i_wb_stb)&&(i_wb_we);
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always @(posedge i_clk)
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last_stb <= (i_wb_stb);
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reg [(AW-1):0] last_addr;
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reg [(DW-1):0] last_data;
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reg [(DW/8-1):0] last_sel;
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always @(posedge i_clk)
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last_data <= i_wb_data;
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always @(posedge i_clk)
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last_addr <= i_wb_addr;
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always @(posedge i_clk)
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last_sel <= i_wb_sel;
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assign w_wstb = last_wstb;
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assign w_stb = last_stb;
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assign w_addr = last_addr;
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assign w_data = last_data;
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assign w_sel = last_sel;
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end endgenerate
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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[w_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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begin
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mem[i_wb_addr] <= i_wb_data;
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if ((w_wstb)&&(w_sel[3]))
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mem[w_addr][31:24] <= w_data[31:24];
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if ((w_wstb)&&(w_sel[2]))
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mem[w_addr][23:16] <= w_data[23:16];
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if ((w_wstb)&&(w_sel[1]))
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mem[w_addr][15: 8] <= w_data[15:8];
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if ((w_wstb)&&(w_sel[0]))
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mem[w_addr][ 7: 0] <= w_data[7:0];
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end
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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 <= (w_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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