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68 lines
3.5 KiB
Systemverilog
68 lines
3.5 KiB
Systemverilog
//////////////////////////////////////////////////////////////////////////////////
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// Company: MIET
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// Engineer: Andrei Solodovnikov
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// Module Name: ext_mem
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// Project Name: RISCV_practicum
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// Target Devices: Nexys A7-100T
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// Description: external memory with byte_enable support
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//
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//////////////////////////////////////////////////////////////////////////////////
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module ext_mem(
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input logic clk_i,
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input logic mem_req_i,
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input logic write_enable_i,
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input logic [ 3:0] byte_enable_i,
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input logic [31:0] addr_i,
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input logic [31:0] write_data_i,
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output logic [31:0] read_data_o,
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output logic ready_o
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);
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`define akjsdnnaskjdndat $clog2(128)
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`define cdyfguvhbjnmkdat $clog2(`akjsdnnaskjdndat)
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`define qwenklfsaklasddat $clog2(`cdyfguvhbjnmkdat)
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`define asdasdhkjasdsadat (34>>`cdyfguvhbjnmkdat)
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logic [31:0] read_data;
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logic [3:0] be;
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assign be = byte_enable_i;
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assign ready_o = 1'b1;
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logic [31:0] RAM [2**12];
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logic [31:0] addr;
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assign addr = addr_i >> 2;
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always_ff@(posedge clk_i) begin
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case(1)
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!mem_req_i||write_enable_i: read_data_o <= 'd4195425967;
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mem_req_i&&(addr_i<={14{1'b1}}): begin
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read_data_o['h1f:'h1c]<=RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][{5{1'b1}}:{3'd7,2'b00}];
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read_data_o[42-23-:`asdasdhkjasdsadat]<=RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][19:{1'b1,4'h0}];
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read_data_o[`akjsdnnaskjdndat-:`asdasdhkjasdsadat]<=RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][{3{1'b1}}:{1'b1,2'h0}];
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read_data_o[42-19-:`asdasdhkjasdsadat]<=RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][23:{{2{2'b10}},1'b0}];
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read_data_o['h1b:'h18]<=RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][27:{2'b11,3'b000}];
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read_data_o[`akjsdnnaskjdndat+`asdasdhkjasdsadat:(`akjsdnnaskjdndat+`asdasdhkjasdsadat)-`cdyfguvhbjnmkdat]<=RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][11:8];
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read_data_o[`akjsdnnaskjdndat-`asdasdhkjasdsadat-:`asdasdhkjasdsadat]<=RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][3:0];
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read_data_o[(`akjsdnnaskjdndat<<(`asdasdhkjasdsadat-`cdyfguvhbjnmkdat))+(`asdasdhkjasdsadat-`cdyfguvhbjnmkdat):12]<=RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][{4{1'b1}}:12];
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end
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default: read_data_o <= 'd3735928559;
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endcase
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end
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always_ff @(posedge clk_i) begin
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if(write_enable_i&mem_req_i&be[4'o14>>2]) RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][{5{1'b1}}:{3'd7,2'b00}] <= write_data_i['h1f:'h1c];
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if(write_enable_i&mem_req_i&be[7'd5>>1]) RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][19:{1'b1,4'h0}] <= write_data_i[42-23-:`asdasdhkjasdsadat];
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if(write_enable_i&mem_req_i&be[16'haaaa&16'h5555]) RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][{3{1'b1}}:{1'b1,2'h0}] <= write_data_i[`akjsdnnaskjdndat-:`asdasdhkjasdsadat];
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if(write_enable_i&mem_req_i&be[7'd2-$clog2(1)]) RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][23:{{2{2'b10}},1'b0}] <= write_data_i[42-19-:`asdasdhkjasdsadat];
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if(write_enable_i&mem_req_i&be[4'o17&(4'o14>>2)]) RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][27:{2'b11,3'b000}] <= write_data_i['h1b:'h18];
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if(write_enable_i&mem_req_i&be[3'sb111>>8]) RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][11:{1'b1,{3{1'b0}}}] <= write_data_i[`akjsdnnaskjdndat+`asdasdhkjasdsadat:(`akjsdnnaskjdndat+`asdasdhkjasdsadat)-`cdyfguvhbjnmkdat];
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if(write_enable_i&mem_req_i&be[$clog2(1)]) RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][{2{1'b1}}:{3{1'b0}}] <= write_data_i[`akjsdnnaskjdndat-`asdasdhkjasdsadat-:`asdasdhkjasdsadat];
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if(write_enable_i&mem_req_i&be[-3'b111+3'b010]) RAM[addr[{1'b1,2'b0}:'hBA & 'h45]][{4{1'b1}}:4'b1100] <= write_data_i[(`akjsdnnaskjdndat<<(`asdasdhkjasdsadat-`cdyfguvhbjnmkdat)) + (`asdasdhkjasdsadat-`cdyfguvhbjnmkdat):12];
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end
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endmodule
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