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[/] [wf3d/] [trunk/] [implement/] [rtl/] [fm_hvc/] [fm_cmn_ram.v] - Rev 8
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//======================================================================= // Project Monophony // Wire-Frame 3D Graphics Accelerator IP Core // // File: // fm_cmn_ram.v // // Abstract: // Dualport RAM, this will be mapped to block ram // with different clocks // // Author: // Kenji Ishimaru (info.wf3d@gmail.com) // //====================================================================== // // Copyright (c) 2015, Kenji Ishimaru // All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are met: // // -Redistributions of source code must retain the above copyright notice, // this list of conditions and the following disclaimer. // -Redistributions in binary form must reproduce the above copyright notice, // this list of conditions and the following disclaimer in the documentation // and/or other materials provided with the distribution. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, // EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // // Revision History module fm_cmn_ram ( clka, clkb, wea, addra, addrb, dia, doa, dob ); ////////////////////////////////// // parameter ////////////////////////////////// parameter P_RAM_TYPE="TYPE_A"; parameter P_WIDTH = 32; parameter P_RANGE = 2; parameter P_DEPTH = 1 << P_RANGE; ////////////////////////////////// // I/O port definition ////////////////////////////////// input clka; input clkb; input wea; input [P_RANGE-1:0] addra; input [P_RANGE-1:0] addrb; input [P_WIDTH-1:0] dia; output [P_WIDTH-1:0] doa; output [P_WIDTH-1:0] dob; ////////////////////////////////// // reg ////////////////////////////////// reg [P_WIDTH-1:0] ram [P_DEPTH-1:0]; reg [P_WIDTH-1:0] doa; reg [P_WIDTH-1:0] dob; ////////////////////////////////// // always ////////////////////////////////// generate if (P_RAM_TYPE=="TYPE_A") begin always @(posedge clka) begin if (wea) ram[addra] <= dia; end always @(posedge clkb) begin dob <= ram[addrb]; end end else begin // port A: write-first always @(posedge clka) begin if (wea) begin ram[addra] <= dia; doa <= dia; end else begin doa <= ram[addra]; end end // port B: read-first always @(posedge clkb) begin dob <= ram[addrb]; end end endgenerate endmodule
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