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alfik |
/*
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* Copyright (c) 2014, Aleksander Osman
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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, this
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* list of conditions and the following disclaimer.
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*
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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, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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`include "defines.v"
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module dcache_write(
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input [127:0] line,
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input [31:0] address,
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input [2:0] length,
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input [31:0] write_data,
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output [1:0] write_burst_dword_length,
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output [3:0] write_burst_byteenable_0,
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output [3:0] write_burst_byteenable_1,
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output [55:0] write_burst_data,
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output [127:0] line_merged
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);
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//------------------------------------------------------------------------------
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assign write_burst_dword_length =
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(length == 3'd2 && address[1:0] == 2'b11)? 2'd2 :
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(length == 3'd3 && address[1] == 1'b1)? 2'd2 :
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(length == 3'd4 && address[1:0] != 2'b00)? 2'd2 :
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2'd1;
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assign write_burst_byteenable_0 =
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(address[1:0] == 2'd0 && length == 3'd1)? 4'b0001 :
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(address[1:0] == 2'd1 && length == 3'd1)? 4'b0010 :
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(address[1:0] == 2'd2 && length == 3'd1)? 4'b0100 :
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(address[1:0] == 2'd0 && length == 3'd2)? 4'b0011 :
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(address[1:0] == 2'd1 && length == 3'd2)? 4'b0110 :
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(address[1:0] == 2'd0 && length == 3'd3)? 4'b0111 :
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(address[1:0] == 2'd1 && length >= 3'd3)? 4'b1110 :
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(address[1:0] == 2'd2 && length >= 3'd2)? 4'b1100 :
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(address[1:0] == 2'd0 && length == 3'd4)? 4'b1111 :
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4'b1000; //(address[1:0] == 2'd3)?
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assign write_burst_byteenable_1 =
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(address[1:0] == 2'd3 && length == 3'd2)? 4'b0001 :
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(address[1:0] == 2'd2 && length == 3'd3)? 4'b0001 :
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(address[1:0] == 2'd3 && length == 3'd3)? 4'b0011 :
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(address[1:0] == 2'd1 && length == 3'd4)? 4'b0001 :
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(address[1:0] == 2'd2 && length == 3'd4)? 4'b0011 :
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4'b0111; //(address[1:0] == 2'd3 && length == 3'd4)?
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assign write_burst_data =
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(address[1:0] == 2'd0)? { 24'd0, write_data[31:0] } :
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(address[1:0] == 2'd1)? { 16'd0, write_data[31:0], 8'd0 } :
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(address[1:0] == 2'd2)? { 8'd0, write_data[31:0], 16'd0 } :
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{ write_data[31:0], 24'd0 };
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assign line_merged =
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(address[3:0] == 4'd0 && length == 3'd1)? { line[127:8], write_data[7:0] } :
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(address[3:0] == 4'd1 && length == 3'd1)? { line[127:16], write_data[7:0], line[7:0] } :
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(address[3:0] == 4'd2 && length == 3'd1)? { line[127:24], write_data[7:0], line[15:0] } :
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(address[3:0] == 4'd3 && length == 3'd1)? { line[127:32], write_data[7:0], line[23:0] } :
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(address[3:0] == 4'd4 && length == 3'd1)? { line[127:40], write_data[7:0], line[31:0] } :
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(address[3:0] == 4'd5 && length == 3'd1)? { line[127:48], write_data[7:0], line[39:0] } :
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(address[3:0] == 4'd6 && length == 3'd1)? { line[127:56], write_data[7:0], line[47:0] } :
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(address[3:0] == 4'd7 && length == 3'd1)? { line[127:64], write_data[7:0], line[55:0] } :
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(address[3:0] == 4'd8 && length == 3'd1)? { line[127:72], write_data[7:0], line[63:0] } :
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(address[3:0] == 4'd9 && length == 3'd1)? { line[127:80], write_data[7:0], line[71:0] } :
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(address[3:0] == 4'd10 && length == 3'd1)? { line[127:88], write_data[7:0], line[79:0] } :
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(address[3:0] == 4'd11 && length == 3'd1)? { line[127:96], write_data[7:0], line[87:0] } :
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(address[3:0] == 4'd12 && length == 3'd1)? { line[127:104], write_data[7:0], line[95:0] } :
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(address[3:0] == 4'd13 && length == 3'd1)? { line[127:112], write_data[7:0], line[103:0] } :
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(address[3:0] == 4'd14 && length == 3'd1)? { line[127:120], write_data[7:0], line[111:0] } :
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(address[3:0] == 4'd15 && length == 3'd1)? { write_data[7:0], line[119:0] } :
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(address[3:0] == 4'd0 && length == 3'd2)? { line[127:16], write_data[15:0] } :
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(address[3:0] == 4'd1 && length == 3'd2)? { line[127:24], write_data[15:0], line[7:0] } :
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(address[3:0] == 4'd2 && length == 3'd2)? { line[127:32], write_data[15:0], line[15:0] } :
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(address[3:0] == 4'd3 && length == 3'd2)? { line[127:40], write_data[15:0], line[23:0] } :
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(address[3:0] == 4'd4 && length == 3'd2)? { line[127:48], write_data[15:0], line[31:0] } :
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(address[3:0] == 4'd5 && length == 3'd2)? { line[127:56], write_data[15:0], line[39:0] } :
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(address[3:0] == 4'd6 && length == 3'd2)? { line[127:64], write_data[15:0], line[47:0] } :
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(address[3:0] == 4'd7 && length == 3'd2)? { line[127:72], write_data[15:0], line[55:0] } :
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(address[3:0] == 4'd8 && length == 3'd2)? { line[127:80], write_data[15:0], line[63:0] } :
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(address[3:0] == 4'd9 && length == 3'd2)? { line[127:88], write_data[15:0], line[71:0] } :
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(address[3:0] == 4'd10 && length == 3'd2)? { line[127:96], write_data[15:0], line[79:0] } :
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(address[3:0] == 4'd11 && length == 3'd2)? { line[127:104], write_data[15:0], line[87:0] } :
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(address[3:0] == 4'd12 && length == 3'd2)? { line[127:112], write_data[15:0], line[95:0] } :
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(address[3:0] == 4'd13 && length == 3'd2)? { line[127:120], write_data[15:0], line[103:0] } :
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(address[3:0] == 4'd14 && length == 3'd2)? { write_data[15:0], line[111:0] } :
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(address[3:0] == 4'd0 && length == 3'd3)? { line[127:24], write_data[23:0] } :
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(address[3:0] == 4'd1 && length == 3'd3)? { line[127:32], write_data[23:0], line[7:0] } :
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(address[3:0] == 4'd2 && length == 3'd3)? { line[127:40], write_data[23:0], line[15:0] } :
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(address[3:0] == 4'd3 && length == 3'd3)? { line[127:48], write_data[23:0], line[23:0] } :
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(address[3:0] == 4'd4 && length == 3'd3)? { line[127:56], write_data[23:0], line[31:0] } :
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(address[3:0] == 4'd5 && length == 3'd3)? { line[127:64], write_data[23:0], line[39:0] } :
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(address[3:0] == 4'd6 && length == 3'd3)? { line[127:72], write_data[23:0], line[47:0] } :
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(address[3:0] == 4'd7 && length == 3'd3)? { line[127:80], write_data[23:0], line[55:0] } :
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(address[3:0] == 4'd8 && length == 3'd3)? { line[127:88], write_data[23:0], line[63:0] } :
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(address[3:0] == 4'd9 && length == 3'd3)? { line[127:96], write_data[23:0], line[71:0] } :
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(address[3:0] == 4'd10 && length == 3'd3)? { line[127:104], write_data[23:0], line[79:0] } :
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(address[3:0] == 4'd11 && length == 3'd3)? { line[127:112], write_data[23:0], line[87:0] } :
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(address[3:0] == 4'd12 && length == 3'd3)? { line[127:120], write_data[23:0], line[95:0] } :
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(address[3:0] == 4'd13 && length == 3'd3)? { write_data[23:0], line[103:0] } :
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(address[3:0] == 4'd0 && length == 3'd4)? { line[127:32], write_data[31:0] } :
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(address[3:0] == 4'd1 && length == 3'd4)? { line[127:40], write_data[31:0], line[7:0] } :
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(address[3:0] == 4'd2 && length == 3'd4)? { line[127:48], write_data[31:0], line[15:0] } :
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(address[3:0] == 4'd3 && length == 3'd4)? { line[127:56], write_data[31:0], line[23:0] } :
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(address[3:0] == 4'd4 && length == 3'd4)? { line[127:64], write_data[31:0], line[31:0] } :
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(address[3:0] == 4'd5 && length == 3'd4)? { line[127:72], write_data[31:0], line[39:0] } :
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(address[3:0] == 4'd6 && length == 3'd4)? { line[127:80], write_data[31:0], line[47:0] } :
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(address[3:0] == 4'd7 && length == 3'd4)? { line[127:88], write_data[31:0], line[55:0] } :
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(address[3:0] == 4'd8 && length == 3'd4)? { line[127:96], write_data[31:0], line[63:0] } :
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(address[3:0] == 4'd9 && length == 3'd4)? { line[127:104], write_data[31:0], line[71:0] } :
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(address[3:0] == 4'd10 && length == 3'd4)? { line[127:112], write_data[31:0], line[79:0] } :
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(address[3:0] == 4'd11 && length == 3'd4)? { line[127:120], write_data[31:0], line[87:0] } :
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{ write_data[31:0], line[95:0] }; //(address[3:0] == 3'd12 && dlength == 3'd4)?
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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// synthesis translate_off
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wire _unused_ok = &{ 1'b0, address[31:4], 1'b0 };
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// synthesis translate_on
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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endmodule
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