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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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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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6'd36: scan_forward = 6'd39;
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6'd37: scan_forward = 6'd45;
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6'd38: scan_forward = 6'd52;
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6'd39: scan_forward = 6'd54;
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6'd40: scan_forward = 6'd20;
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6'd41: scan_forward = 6'd22;
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6'd42: scan_forward = 6'd33;
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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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6'd46: scan_forward = 6'd55;
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6'd47: scan_forward = 6'd60;
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6'd48: scan_forward = 6'd21;
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6'd49: scan_forward = 6'd34;
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6'd50: scan_forward = 6'd37;
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6'd51: scan_forward = 6'd47;
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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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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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begin
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| 175 |
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if (alternate_scan)
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/*
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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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6'd22: scan_reverse = 6'd4;
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6'd36: scan_reverse = 6'd5;
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6'd38: scan_reverse = 6'd6;
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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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6'd53: scan_reverse = 6'd15;
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6'd02: scan_reverse = 6'd16;
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6'd08: scan_reverse = 6'd17;
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6'd19: scan_reverse = 6'd18;
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6'd24: scan_reverse = 6'd19;
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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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6'd50: scan_reverse = 6'd22;
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6'd54: scan_reverse = 6'd23;
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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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*/
|
| 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;
|
| 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;
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| 270 |
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6'd25: scan_reverse = 6'd20;
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| 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;
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| 279 |
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6'd40: scan_reverse = 6'd29;
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| 280 |
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6'd44: scan_reverse = 6'd30;
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| 281 |
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6'd53: scan_reverse = 6'd31;
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| 282 |
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6'd10: scan_reverse = 6'd32;
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| 283 |
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6'd19: scan_reverse = 6'd33;
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| 284 |
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6'd23: scan_reverse = 6'd34;
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| 285 |
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6'd32: scan_reverse = 6'd35;
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| 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;
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| 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;
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| 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;
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| 303 |
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6'd56: scan_reverse = 6'd53;
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| 304 |
|
|
6'd59: scan_reverse = 6'd54;
|
| 305 |
|
|
6'd61: scan_reverse = 6'd55;
|
| 306 |
|
|
6'd35: scan_reverse = 6'd56;
|
| 307 |
|
|
6'd36: scan_reverse = 6'd57;
|
| 308 |
|
|
6'd48: scan_reverse = 6'd58;
|
| 309 |
|
|
6'd49: scan_reverse = 6'd59;
|
| 310 |
|
|
6'd57: scan_reverse = 6'd60;
|
| 311 |
|
|
6'd58: scan_reverse = 6'd61;
|
| 312 |
|
|
6'd62: scan_reverse = 6'd62;
|
| 313 |
|
|
6'd63: scan_reverse = 6'd63;
|
| 314 |
|
|
endcase
|
| 315 |
|
|
end
|
| 316 |
|
|
endfunction
|
| 317 |
|
|
/* not truncated */
|
