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//=======================================================================
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// Project Monophony
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// Wire-Frame 3D Graphics Accelerator IP Core
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//
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// File:
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// fm_cmn_ram.v
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//
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// Abstract:
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// Dualport RAM, this will be mapped to block ram
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// with different clocks
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//
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// Author:
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// Kenji Ishimaru (info.wf3d@gmail.com)
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//
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//======================================================================
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//
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// Copyright (c) 2015, Kenji Ishimaru
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// -Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// -Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Revision History
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module fm_cmn_ram (
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clka,
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clkb,
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wea,
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addra,
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addrb,
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dia,
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doa,
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dob
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);
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//////////////////////////////////
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// parameter
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//////////////////////////////////
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parameter P_RAM_TYPE="TYPE_A";
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parameter P_WIDTH = 32;
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parameter P_RANGE = 2;
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parameter P_DEPTH = 1 << P_RANGE;
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//////////////////////////////////
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// I/O port definition
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//////////////////////////////////
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input clka;
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input clkb;
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input wea;
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input [P_RANGE-1:0] addra;
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input [P_RANGE-1:0] addrb;
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input [P_WIDTH-1:0] dia;
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output [P_WIDTH-1:0] doa;
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output [P_WIDTH-1:0] dob;
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//////////////////////////////////
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// reg
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//////////////////////////////////
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reg [P_WIDTH-1:0] ram [P_DEPTH-1:0];
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reg [P_WIDTH-1:0] doa;
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reg [P_WIDTH-1:0] dob;
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//////////////////////////////////
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// always
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//////////////////////////////////
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generate
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if (P_RAM_TYPE=="TYPE_A") begin
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always @(posedge clka) begin
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if (wea) ram[addra] <= dia;
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end
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always @(posedge clkb) begin
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dob <= ram[addrb];
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end
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end else begin
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// port A: write-first
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always @(posedge clka) begin
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if (wea) begin
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ram[addra] <= dia;
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doa <= dia;
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end else begin
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doa <= ram[addra];
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end
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end
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// port B: read-first
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always @(posedge clkb) begin
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dob <= ram[addrb];
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end
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end
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endgenerate
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endmodule
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