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kdv |
/*
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* zigzag_table.v
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*
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* Copyright (c) 2007 Koen De Vleeschauwer.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* zigzag_table - different zig-zag scanning orders.
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*/
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function [5:0]scan_forward;
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input alternate_scan;
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input [5:0]u_v;
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begin
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if (alternate_scan)
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/*
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* zig-zag scanning order 1. par. 7.3
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*/
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casex(u_v)
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6'd00: scan_forward = 6'd0;
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6'd01: scan_forward = 6'd4;
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6'd02: scan_forward = 6'd6;
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6'd03: scan_forward = 6'd20;
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6'd04: scan_forward = 6'd22;
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6'd05: scan_forward = 6'd36;
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6'd06: scan_forward = 6'd38;
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6'd07: scan_forward = 6'd52;
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6'd08: scan_forward = 6'd1;
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6'd09: scan_forward = 6'd5;
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6'd10: scan_forward = 6'd7;
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6'd11: scan_forward = 6'd21;
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6'd12: scan_forward = 6'd23;
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6'd13: scan_forward = 6'd37;
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6'd14: scan_forward = 6'd39;
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6'd15: scan_forward = 6'd53;
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6'd16: scan_forward = 6'd2;
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6'd17: scan_forward = 6'd8;
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6'd18: scan_forward = 6'd19;
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6'd19: scan_forward = 6'd24;
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6'd20: scan_forward = 6'd34;
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6'd21: scan_forward = 6'd40;
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6'd22: scan_forward = 6'd50;
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6'd23: scan_forward = 6'd54;
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6'd24: scan_forward = 6'd3;
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6'd25: scan_forward = 6'd9;
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6'd26: scan_forward = 6'd18;
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6'd27: scan_forward = 6'd25;
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6'd28: scan_forward = 6'd35;
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6'd29: scan_forward = 6'd41;
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6'd30: scan_forward = 6'd51;
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6'd31: scan_forward = 6'd55;
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6'd32: scan_forward = 6'd10;
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6'd33: scan_forward = 6'd17;
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6'd34: scan_forward = 6'd26;
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6'd35: scan_forward = 6'd30;
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6'd36: scan_forward = 6'd42;
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6'd37: scan_forward = 6'd46;
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6'd38: scan_forward = 6'd56;
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6'd39: scan_forward = 6'd60;
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6'd40: scan_forward = 6'd11;
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6'd41: scan_forward = 6'd16;
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6'd42: scan_forward = 6'd27;
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6'd43: scan_forward = 6'd31;
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6'd44: scan_forward = 6'd43;
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6'd45: scan_forward = 6'd47;
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6'd46: scan_forward = 6'd57;
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6'd47: scan_forward = 6'd61;
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6'd48: scan_forward = 6'd12;
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6'd49: scan_forward = 6'd15;
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6'd50: scan_forward = 6'd28;
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6'd51: scan_forward = 6'd32;
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6'd52: scan_forward = 6'd44;
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6'd53: scan_forward = 6'd48;
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6'd54: scan_forward = 6'd58;
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6'd55: scan_forward = 6'd62;
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6'd56: scan_forward = 6'd13;
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6'd57: scan_forward = 6'd14;
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6'd58: scan_forward = 6'd29;
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6'd59: scan_forward = 6'd33;
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6'd60: scan_forward = 6'd45;
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6'd61: scan_forward = 6'd49;
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6'd62: scan_forward = 6'd59;
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6'd63: scan_forward = 6'd63;
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endcase
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else
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/*
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* zig-zag scanning order 0. par. 7.3
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*/
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casex(u_v)
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6'd0: scan_forward = 6'd0;
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6'd1: scan_forward = 6'd1;
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6'd2: scan_forward = 6'd5;
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6'd3: scan_forward = 6'd6;
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6'd4: scan_forward = 6'd14;
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6'd5: scan_forward = 6'd15;
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6'd6: scan_forward = 6'd27;
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6'd7: scan_forward = 6'd28;
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6'd8: scan_forward = 6'd2;
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6'd9: scan_forward = 6'd4;
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6'd10: scan_forward = 6'd7;
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6'd11: scan_forward = 6'd13;
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6'd12: scan_forward = 6'd16;
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6'd13: scan_forward = 6'd26;
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6'd14: scan_forward = 6'd29;
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6'd15: scan_forward = 6'd42;
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6'd16: scan_forward = 6'd3;
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6'd17: scan_forward = 6'd8;
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6'd18: scan_forward = 6'd12;
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6'd19: scan_forward = 6'd17;
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6'd20: scan_forward = 6'd25;
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6'd21: scan_forward = 6'd30;
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6'd22: scan_forward = 6'd41;
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6'd23: scan_forward = 6'd43;
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6'd24: scan_forward = 6'd9;
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6'd25: scan_forward = 6'd11;
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6'd26: scan_forward = 6'd18;
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6'd27: scan_forward = 6'd24;
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6'd28: scan_forward = 6'd31;
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6'd29: scan_forward = 6'd40;
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6'd30: scan_forward = 6'd44;
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6'd31: scan_forward = 6'd53;
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134 |
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6'd32: scan_forward = 6'd10;
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6'd33: scan_forward = 6'd19;
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6'd34: scan_forward = 6'd23;
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6'd35: scan_forward = 6'd32;
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138 |
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6'd36: scan_forward = 6'd39;
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139 |
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6'd37: scan_forward = 6'd45;
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140 |
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6'd38: scan_forward = 6'd52;
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141 |
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6'd39: scan_forward = 6'd54;
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142 |
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6'd40: scan_forward = 6'd20;
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143 |
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6'd41: scan_forward = 6'd22;
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144 |
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6'd42: scan_forward = 6'd33;
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145 |
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6'd43: scan_forward = 6'd38;
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6'd44: scan_forward = 6'd46;
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6'd45: scan_forward = 6'd51;
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148 |
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6'd46: scan_forward = 6'd55;
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149 |
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6'd47: scan_forward = 6'd60;
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150 |
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6'd48: scan_forward = 6'd21;
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151 |
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6'd49: scan_forward = 6'd34;
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152 |
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6'd50: scan_forward = 6'd37;
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153 |
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6'd51: scan_forward = 6'd47;
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154 |
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6'd52: scan_forward = 6'd50;
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6'd53: scan_forward = 6'd56;
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6'd54: scan_forward = 6'd59;
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6'd55: scan_forward = 6'd61;
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6'd56: scan_forward = 6'd35;
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6'd57: scan_forward = 6'd36;
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160 |
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6'd58: scan_forward = 6'd48;
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6'd59: scan_forward = 6'd49;
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6'd60: scan_forward = 6'd57;
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6'd61: scan_forward = 6'd58;
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6'd62: scan_forward = 6'd62;
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6'd63: scan_forward = 6'd63;
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endcase
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end
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endfunction
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function [5:0]scan_reverse;
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input alternate_scan;
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input [5:0]u_v;
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174 |
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begin
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175 |
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if (alternate_scan)
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176 |
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/*
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177 |
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* inverse zig-zag scanning order 1. par. 7.3
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*/
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casex(u_v)
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6'd00: scan_reverse = 6'd0;
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6'd04: scan_reverse = 6'd1;
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6'd06: scan_reverse = 6'd2;
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6'd20: scan_reverse = 6'd3;
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184 |
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6'd22: scan_reverse = 6'd4;
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6'd36: scan_reverse = 6'd5;
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186 |
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6'd38: scan_reverse = 6'd6;
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187 |
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6'd52: scan_reverse = 6'd7;
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6'd01: scan_reverse = 6'd8;
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189 |
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6'd05: scan_reverse = 6'd9;
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190 |
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6'd07: scan_reverse = 6'd10;
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191 |
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6'd21: scan_reverse = 6'd11;
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192 |
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6'd23: scan_reverse = 6'd12;
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193 |
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6'd37: scan_reverse = 6'd13;
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194 |
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6'd39: scan_reverse = 6'd14;
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195 |
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6'd53: scan_reverse = 6'd15;
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196 |
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6'd02: scan_reverse = 6'd16;
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197 |
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6'd08: scan_reverse = 6'd17;
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198 |
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6'd19: scan_reverse = 6'd18;
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199 |
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6'd24: scan_reverse = 6'd19;
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200 |
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6'd34: scan_reverse = 6'd20;
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201 |
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6'd40: scan_reverse = 6'd21;
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202 |
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6'd50: scan_reverse = 6'd22;
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203 |
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6'd54: scan_reverse = 6'd23;
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204 |
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6'd03: scan_reverse = 6'd24;
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205 |
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6'd09: scan_reverse = 6'd25;
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206 |
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6'd18: scan_reverse = 6'd26;
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207 |
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6'd25: scan_reverse = 6'd27;
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208 |
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6'd35: scan_reverse = 6'd28;
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209 |
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6'd41: scan_reverse = 6'd29;
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210 |
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6'd51: scan_reverse = 6'd30;
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211 |
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6'd55: scan_reverse = 6'd31;
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212 |
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6'd10: scan_reverse = 6'd32;
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213 |
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6'd17: scan_reverse = 6'd33;
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214 |
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6'd26: scan_reverse = 6'd34;
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215 |
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6'd30: scan_reverse = 6'd35;
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216 |
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6'd42: scan_reverse = 6'd36;
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217 |
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6'd46: scan_reverse = 6'd37;
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218 |
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6'd56: scan_reverse = 6'd38;
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219 |
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6'd60: scan_reverse = 6'd39;
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220 |
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6'd11: scan_reverse = 6'd40;
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221 |
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6'd16: scan_reverse = 6'd41;
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222 |
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6'd27: scan_reverse = 6'd42;
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223 |
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6'd31: scan_reverse = 6'd43;
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224 |
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6'd43: scan_reverse = 6'd44;
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225 |
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6'd47: scan_reverse = 6'd45;
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226 |
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6'd57: scan_reverse = 6'd46;
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227 |
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6'd61: scan_reverse = 6'd47;
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228 |
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6'd12: scan_reverse = 6'd48;
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229 |
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6'd15: scan_reverse = 6'd49;
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230 |
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6'd28: scan_reverse = 6'd50;
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231 |
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6'd32: scan_reverse = 6'd51;
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232 |
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6'd44: scan_reverse = 6'd52;
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233 |
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6'd48: scan_reverse = 6'd53;
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234 |
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6'd58: scan_reverse = 6'd54;
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235 |
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6'd62: scan_reverse = 6'd55;
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236 |
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6'd13: scan_reverse = 6'd56;
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237 |
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6'd14: scan_reverse = 6'd57;
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238 |
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6'd29: scan_reverse = 6'd58;
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239 |
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6'd33: scan_reverse = 6'd59;
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240 |
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6'd45: scan_reverse = 6'd60;
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241 |
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6'd49: scan_reverse = 6'd61;
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242 |
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6'd59: scan_reverse = 6'd62;
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243 |
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6'd63: scan_reverse = 6'd63;
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244 |
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endcase
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245 |
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else
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246 |
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/*
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247 |
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* inverse zig-zag scanning order 0. par. 7.3
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248 |
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*/
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249 |
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casex(u_v)
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250 |
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6'd00: scan_reverse = 6'd0;
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251 |
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6'd01: scan_reverse = 6'd1;
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252 |
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6'd05: scan_reverse = 6'd2;
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253 |
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6'd06: scan_reverse = 6'd3;
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254 |
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6'd14: scan_reverse = 6'd4;
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255 |
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6'd15: scan_reverse = 6'd5;
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256 |
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6'd27: scan_reverse = 6'd6;
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257 |
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6'd28: scan_reverse = 6'd7;
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258 |
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6'd02: scan_reverse = 6'd8;
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259 |
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6'd04: scan_reverse = 6'd9;
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260 |
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6'd07: scan_reverse = 6'd10;
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261 |
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6'd13: scan_reverse = 6'd11;
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262 |
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6'd16: scan_reverse = 6'd12;
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263 |
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6'd26: scan_reverse = 6'd13;
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264 |
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6'd29: scan_reverse = 6'd14;
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265 |
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6'd42: scan_reverse = 6'd15;
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266 |
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6'd03: scan_reverse = 6'd16;
|
267 |
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6'd08: scan_reverse = 6'd17;
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268 |
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6'd12: scan_reverse = 6'd18;
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269 |
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6'd17: scan_reverse = 6'd19;
|
270 |
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6'd25: scan_reverse = 6'd20;
|
271 |
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6'd30: scan_reverse = 6'd21;
|
272 |
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6'd41: scan_reverse = 6'd22;
|
273 |
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6'd43: scan_reverse = 6'd23;
|
274 |
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6'd09: scan_reverse = 6'd24;
|
275 |
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6'd11: scan_reverse = 6'd25;
|
276 |
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6'd18: scan_reverse = 6'd26;
|
277 |
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6'd24: scan_reverse = 6'd27;
|
278 |
|
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6'd31: scan_reverse = 6'd28;
|
279 |
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6'd40: scan_reverse = 6'd29;
|
280 |
|
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6'd44: scan_reverse = 6'd30;
|
281 |
|
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6'd53: scan_reverse = 6'd31;
|
282 |
|
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6'd10: scan_reverse = 6'd32;
|
283 |
|
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6'd19: scan_reverse = 6'd33;
|
284 |
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6'd23: scan_reverse = 6'd34;
|
285 |
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6'd32: scan_reverse = 6'd35;
|
286 |
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6'd39: scan_reverse = 6'd36;
|
287 |
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6'd45: scan_reverse = 6'd37;
|
288 |
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6'd52: scan_reverse = 6'd38;
|
289 |
|
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6'd54: scan_reverse = 6'd39;
|
290 |
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6'd20: scan_reverse = 6'd40;
|
291 |
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6'd22: scan_reverse = 6'd41;
|
292 |
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6'd33: scan_reverse = 6'd42;
|
293 |
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6'd38: scan_reverse = 6'd43;
|
294 |
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6'd46: scan_reverse = 6'd44;
|
295 |
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6'd51: scan_reverse = 6'd45;
|
296 |
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6'd55: scan_reverse = 6'd46;
|
297 |
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6'd60: scan_reverse = 6'd47;
|
298 |
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6'd21: scan_reverse = 6'd48;
|
299 |
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6'd34: scan_reverse = 6'd49;
|
300 |
|
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6'd37: scan_reverse = 6'd50;
|
301 |
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6'd47: scan_reverse = 6'd51;
|
302 |
|
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6'd50: scan_reverse = 6'd52;
|
303 |
|
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6'd56: scan_reverse = 6'd53;
|
304 |
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6'd59: scan_reverse = 6'd54;
|
305 |
|
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6'd61: scan_reverse = 6'd55;
|
306 |
|
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6'd35: scan_reverse = 6'd56;
|
307 |
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6'd36: scan_reverse = 6'd57;
|
308 |
|
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6'd48: scan_reverse = 6'd58;
|
309 |
|
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6'd49: scan_reverse = 6'd59;
|
310 |
|
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6'd57: scan_reverse = 6'd60;
|
311 |
|
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6'd58: scan_reverse = 6'd61;
|
312 |
|
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6'd62: scan_reverse = 6'd62;
|
313 |
|
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6'd63: scan_reverse = 6'd63;
|
314 |
|
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endcase
|
315 |
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end
|
316 |
|
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endfunction
|
317 |
|
|
/* not truncated */
|