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URL https://opencores.org/ocsvn/dmt_tx/dmt_tx/trunk

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Rev 18 → Rev 19

/trunk/const_encoder/rtl/const_enc.v
68,8 → 68,8
input [CONFDW-1:0] conf_data_i;
output xy_ready_o;
output [CNUMW-1:0] carrier_num_o;
output [CONSTW-1:0] x_o;
output [CONSTW-1:0] y_o;
output [CONSTW-1:0] x_o; reg [CONSTW-1:0] x_o;
output [CONSTW-1:0] y_o; reg [CONSTW-1:0] y_o;
 
 
 
81,8 → 81,13
 
reg [SHIFTW-1:0] fast_shift_reg;
reg [SHIFTW-1:0] inter_shift_reg;
reg [MAXBITNUM-1:0] const_input_reg;
reg [MAXBITNUM-1:0] cin;
reg [CONFDW-1:0] bit_load;
 
reg [4:0] msb;
reg [1:0] msb_x;
reg [1:0] msb_y;
 
reg [CONFDW-1:0] BitLoading [0:REG_MEM_LEN-1];
reg [CONFDW-1:0] CarrierNumber [0:REG_MEM_LEN-1];
reg [USED_C_REG_W-1:0] UsedCarrier;
148,5 → 153,150
end
 
 
//
// constellation mapping
//
always @(posedge reset or posedge clk) begin
 
if(reset) begin
x_o <= 9'b0;
y_o <= 9'b0;
end
else begin
case (bit_load)
4'b0010: begin // #2
x_o <= {cin[0], cin[0], cin[0], cin[0], cin[0], cin[0], cin[0], cin[0], 1'b1};
y_o <= {cin[1], cin[1], cin[1], cin[1], cin[1], cin[1], cin[1], cin[1], 1'b1};
end
4'b0011: begin // #3
case (cin[2:0])
3'b000: begin x_o <= 9'b000000001; y_o <= 9'b000000011; end
3'b001: begin x_o <= 9'b000000001; y_o <= 9'b111111111; end
3'b010: begin x_o <= 9'b111111111; y_o <= 9'b000000001; end
3'b011: begin x_o <= 9'b111111111; y_o <= 9'b111111111; end
 
3'b100: begin x_o <= 9'b111111101; y_o <= 9'b000000001; end
3'b101: begin x_o <= 9'b000000001; y_o <= 9'b000000011; end
3'b110: begin x_o <= 9'b111111111; y_o <= 9'b111111101; end
3'b111: begin x_o <= 9'b000000011; y_o <= 9'b111111111; end
endcase
end
4'b0100: begin // #4
x_o <= {cin[2], cin[2], cin[2], cin[2], cin[2], cin[2], cin[2], cin[0], 1'b1};
y_o <= {cin[3], cin[3], cin[3], cin[3], cin[3], cin[3], cin[3], cin[1], 1'b1};
end
4'b0101: begin // #5
map_msb(cin[4:0], msb_x, msb_y);
x_o <= {msb_x[1], msb_x[1], msb_x[1], msb_x[1], msb_x[1], msb_x[1], msb_x[0], 1'b1};
y_o <= {msb_y[1], msb_y[1], msb_y[1], msb_y[1], msb_y[1], msb_y[1], msb_y[0], 1'b1};
end
4'b0110: begin // #6
x_o <= {cin[4], cin[4], cin[4], cin[4], cin[4], cin[4], cin[2], cin[0], 1'b1};
y_o <= {cin[5], cin[5], cin[5], cin[5], cin[5], cin[5], cin[3], cin[1], 1'b1};
end
4'b0111: begin // #7
map_msb(cin[6:2], msb_x, msb_y);
x_o <= {msb_x[1], msb_x[1], msb_x[1], msb_x[1], msb_x[1], msb_x[0], cin[2], cin[0], 1'b1};
y_o <= {msb_y[1], msb_y[1], msb_y[1], msb_y[1], msb_y[1], msb_y[0], cin[3], cin[1], 1'b1};
end
4'b1000: begin // #8
x_o <= {cin[6], cin[6], cin[6], cin[6], cin[6], cin[4], cin[2], cin[0], 1'b1};
y_o <= {cin[7], cin[7], cin[7], cin[7], cin[7], cin[5], cin[3], cin[1], 1'b1};
end
4'b1001: begin // #9
map_msb(cin[7:3], msb_x, msb_y);
x_o <= {msb_x[1], msb_x[1], msb_x[1], msb_x[1], msb_x[0], cin[4], cin[2], cin[0], 1'b1};
y_o <= {msb_y[1], msb_y[1], msb_y[1], msb_y[1], msb_y[0], cin[5], cin[3], cin[1], 1'b1};
end
4'b1010: begin // #10
x_o <= {cin[8], cin[8], cin[8], cin[8], cin[6], cin[4], cin[2], cin[0], 1'b1};
y_o <= {cin[9], cin[9], cin[9], cin[9], cin[7], cin[5], cin[3], cin[1], 1'b1};
end
4'b1011: begin // #11
map_msb(cin[8:4], msb_x, msb_y);
x_o <= {msb_x[1], msb_x[1], msb_x[1], msb_x[0], cin[6], cin[4], cin[2], cin[0], 1'b1};
y_o <= {msb_y[1], msb_y[1], msb_y[1], msb_y[0], cin[7], cin[5], cin[3], cin[1], 1'b1};
end
4'b1100: begin // #12
x_o <= {cin[10], cin[10], cin[10], cin[8], cin[6], cin[4], cin[2], cin[0], 1'b1};
y_o <= {cin[11], cin[11], cin[11], cin[9], cin[7], cin[5], cin[3], cin[1], 1'b1};
end
4'b1101: begin // #13
map_msb(cin[9:5], msb_x, msb_y);
x_o <= {msb_x[1], msb_x[1], msb_x[0], cin[8], cin[6], cin[4], cin[2], cin[0], 1'b1};
y_o <= {msb_y[1], msb_y[1], msb_y[0], cin[9], cin[7], cin[5], cin[3], cin[1], 1'b1};
end
4'b1110: begin // #14
x_o <= {cin[12], cin[12], cin[10], cin[8], cin[6], cin[4], cin[2], cin[0], 1'b1};
y_o <= {cin[13], cin[13], cin[11], cin[9], cin[7], cin[5], cin[3], cin[1], 1'b1};
end
4'b1111: begin // #15 TODO
map_msb(cin[10:6], msb_x, msb_y);
x_o <= {msb_x[1], msb_x[0], cin[10], cin[8], cin[6], cin[4], cin[2], cin[0], 1'b1};
y_o <= {msb_y[1], msb_y[0], cin[11], cin[9], cin[7], cin[5], cin[3], cin[1], 1'b1};
end
 
endcase
end
end
 
//
// determine the top two bits of X and Y based on table 7-12 in G.992.1
//
task map_msb(input [4:0] t_msb, output [1:0] t_msb_x, output [1:0] t_msb_y );
begin
case (t_msb)
5'b00000: begin t_msb_x <= 2'b00; t_msb_y <= 2'b00; end
5'b00001: begin t_msb_x <= 2'b00; t_msb_y <= 2'b00; end
5'b00010: begin t_msb_x <= 2'b00; t_msb_y <= 2'b00; end
5'b00011: begin t_msb_x <= 2'b00; t_msb_y <= 2'b00; end
 
5'b00100: begin t_msb_x <= 2'b00; t_msb_y <= 2'b11; end
5'b00101: begin t_msb_x <= 2'b00; t_msb_y <= 2'b11; end
5'b00110: begin t_msb_x <= 2'b00; t_msb_y <= 2'b11; end
5'b00111: begin t_msb_x <= 2'b00; t_msb_y <= 2'b11; end
5'b01000: begin t_msb_x <= 2'b11; t_msb_y <= 2'b00; end
5'b01001: begin t_msb_x <= 2'b11; t_msb_y <= 2'b00; end
5'b01010: begin t_msb_x <= 2'b11; t_msb_y <= 2'b00; end
5'b01011: begin t_msb_x <= 2'b11; t_msb_y <= 2'b00; end
 
5'b01100: begin t_msb_x <= 2'b11; t_msb_y <= 2'b11; end
5'b01101: begin t_msb_x <= 2'b11; t_msb_y <= 2'b11; end
5'b01110: begin t_msb_x <= 2'b11; t_msb_y <= 2'b11; end
5'b01111: begin t_msb_x <= 2'b11; t_msb_y <= 2'b11; end
 
5'b10000: begin t_msb_x <= 2'b01; t_msb_y <= 2'b00; end
5'b10001: begin t_msb_x <= 2'b01; t_msb_y <= 2'b00; end
5'b10010: begin t_msb_x <= 2'b10; t_msb_y <= 2'b00; end
5'b10011: begin t_msb_x <= 2'b10; t_msb_y <= 2'b00; end
 
5'b10100: begin t_msb_x <= 2'b00; t_msb_y <= 2'b01; end
5'b10101: begin t_msb_x <= 2'b00; t_msb_y <= 2'b10; end
5'b10110: begin t_msb_x <= 2'b00; t_msb_y <= 2'b01; end
5'b10111: begin t_msb_x <= 2'b00; t_msb_y <= 2'b10; end
 
5'b11000: begin t_msb_x <= 2'b11; t_msb_y <= 2'b01; end
5'b11001: begin t_msb_x <= 2'b11; t_msb_y <= 2'b10; end
5'b11010: begin t_msb_x <= 2'b11; t_msb_y <= 2'b01; end
5'b11011: begin t_msb_x <= 2'b11; t_msb_y <= 2'b10; end
5'b11100: begin t_msb_x <= 2'b01; t_msb_y <= 2'b11; end
5'b11101: begin t_msb_x <= 2'b01; t_msb_y <= 2'b11; end
5'b11110: begin t_msb_x <= 2'b10; t_msb_y <= 2'b11; end
5'b11111: begin t_msb_x <= 2'b10; t_msb_y <= 2'b11; end
endcase
end
endtask
 
endmodule

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