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[/] [wf3d/] [trunk/] [rtl/] [core/] [fm_ras_mem.v] - Rev 3
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//======================================================================= // Project Monophony // Wire-Frame 3D Graphics Accelerator IP Core // // File: // fm_ras_mem.v // // Abstract: // Write a pixel to mein memory // generate linear address from x, y position // // Author: // Kenji Ishimaru (kenji.ishimaru@prtissimo.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 `include "fm_3d_define.v" module fm_ras_mem ( // system input clk_core, input rst_x, // Register Configuration input [15:0] i_scr_w, input [15:0] i_scr_h_m1, input [29:0] i_pixel_top_address, input [7:0] i_pixel_color, input i_y_flip, // Pixel In input i_en, output o_ack, input [`D3D_FTOI_WIDTH-1:0] i_x, input [`D3D_FTOI_WIDTH-1:0] i_y, // Pixel Write Memory I/F (Write Only) output o_req_m, output [31:0] o_adrs_m, input i_ack_m, output [3:0] o_be_m, output [31:0] o_dbw_m ); localparam P_IDLE = 'd0; localparam P_REQ = 'd1; ////////////////////////////////// // reg ////////////////////////////////// reg r_state; reg [1:0] r_x; reg [`D3D_FTOI_WIDTH+`D3D_FTOI_WIDTH-2:0] r_adrs_m; // word address ////////////////////////////////// // wire ////////////////////////////////// wire w_set_adrs; wire [`D3D_FTOI_WIDTH+`D3D_FTOI_WIDTH-2:0] w_adrs; wire [`D3D_FTOI_WIDTH-1:0] w_y; wire [29:0] w_top_adrs; ////////////////////////////////// // assign ////////////////////////////////// assign o_req_m = (r_state == P_REQ); assign o_be_m = (r_x[1:0] == 2'b00) ? 4'h1 : (r_x[1:0] == 2'b01) ? 4'h2 : (r_x[1:0] == 2'b10) ? 4'h4 : 4'h8; assign o_dbw_m = {4{i_pixel_color}}; // Byte address //assign w_y = (i_y_flip) ? 'd479 - i_y : i_y; assign w_y = (i_y_flip) ? i_scr_h_m1 - i_y : i_y; // i_scr_w/4 : 1 pixel = 8bit assign w_adrs = i_scr_w[15:2]*w_y + i_x[`D3D_FTOI_WIDTH-1:2]; // exp: 640x480 = 307200(4b000h) assign w_set_adrs = (r_state == P_IDLE) | ((r_state == P_REQ)&i_ack_m&i_en); assign w_top_adrs = i_pixel_top_address + r_adrs_m; assign o_adrs_m = {w_top_adrs,2'h0}; assign o_ack = (r_state == P_REQ) & i_ack_m; ////////////////////////////////// // always ////////////////////////////////// always @(posedge clk_core) begin if (w_set_adrs) begin r_x <= i_x[1:0]; r_adrs_m <= w_adrs; end end `ifdef D3D_SYNC_RESET always @(posedge clk_core) begin `else always @(posedge clk_core or negedge rst_x) begin `endif if (rst_x == `D3D_RESET_POL) begin r_state <= P_IDLE; end else begin case (r_state) P_IDLE: begin if (i_en) r_state <= P_REQ; end P_REQ: begin if (i_ack_m) begin if (i_en) r_state <= P_REQ; else r_state <= P_IDLE; end end endcase end end `ifdef RTL_DEBUG always @(posedge clk_core) begin if (i_en & o_ack) $display("write pixel at x,y = %d %d, color = %h",i_x,i_y,i_pixel_color); end `endif endmodule
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