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一些很好的FPGA设计实例

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		(text "DATA_OUT[12..0]" (rect 0 0 88 12)(font "Arial" ))
		(text "DATA_OUT[12..0]" (rect 107 27 195 39)(font "Arial" ))
		(line (pt 216 32)(pt 200 32)(line_width 3))
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	(drawing
		(rectangle (rect 16 16 200 80)(line_width 1))
	)
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(symbol
	(rect -112 128 -16 224)
	(text "ddiv" (rect 5 0 26 12)(font "Arial" ))
	(text "inst6" (rect 8 80 31 92)(font "Arial" ))
	(port
		(pt 0 32)
		(input)
		(text "clki" (rect 0 0 16 12)(font "Arial" ))
		(text "clki" (rect 21 27 37 39)(font "Arial" ))
		(line (pt 0 32)(pt 16 32)(line_width 1))
	)
	(port
		(pt 96 32)
		(output)
		(text "clko" (rect 0 0 20 12)(font "Arial" ))
		(text "clko" (rect 55 27 75 39)(font "Arial" ))
		(line (pt 96 32)(pt 80 32)(line_width 1))
	)
	(drawing
		(rectangle (rect 16 16 80 80)(line_width 1))
	)
)
(symbol
	(rect -120 -32 -24 64)
	(text "ddiv" (rect 5 0 26 12)(font "Arial" ))
	(text "inst8" (rect 8 80 31 92)(font "Arial" ))
	(port
		(pt 0 32)
		(input)
		(text "clki" (rect 0 0 16 12)(font "Arial" ))
		(text "clki" (rect 21 27 37 39)(font "Arial" ))
		(line (pt 0 32)(pt 16 32)(line_width 1))
	)
	(port
		(pt 96 32)
		(output)
		(text "clko" (rect 0 0 20 12)(font "Arial" ))
		(text "clko" (rect 55 27 75 39)(font "Arial" ))
		(line (pt 96 32)(pt 80 32)(line_width 1))
	)
	(drawing
		(rectangle (rect 16 16 80 80)(line_width 1))
	)
)
(symbol
	(rect 56 128 120 176)
	(text "XOR" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst11" (rect 3 37 32 49)(font "Arial" ))
	(port
		(pt 0 16)
		(input)
		(text "IN1" (rect 2 7 19 19)(font "Courier New" (bold))(invisible))
		(text "IN1" (rect 2 7 19 19)(font "Courier New" (bold))(invisible))
		(line (pt 0 16)(pt 11 16)(line_width 1))
	)
	(port
		(pt 0 32)
		(input)
		(text "IN2" (rect 2 23 19 35)(font "Courier New" (bold))(invisible))
		(text "IN2" (rect 2 23 19 35)(font "Courier New" (bold))(invisible))
		(line (pt 0 32)(pt 11 32)(line_width 1))
	)
	(port
		(pt 64 24)
		(output)
		(text "OUT" (rect 48 15 65 27)(font "Courier New" (bold))(invisible))
		(text "OUT" (rect 48 15 65 27)(font "Courier New" (bold))(invisible))
		(line (pt 49 24)(pt 64 24)(line_width 1))
	)
	(drawing
		(line (pt 14 13)(pt 25 13)(line_width 1))
		(line (pt 14 36)(pt 25 36)(line_width 1))
		(arc (pt 7 29)(pt 7 19)(rect -14 8 19 41)(line_width 1))
		(arc (pt 49 24)(pt 25 13)(rect -6 13 57 76)(line_width 1))
		(arc (pt 25 35)(pt 49 24)(rect -6 -27 57 36)(line_width 1))
		(arc (pt 8 36)(pt 8 12)(rect -21 7 14 42)(line_width 1))
	)
)
(symbol
	(rect -304 -16 -256 16)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst12" (rect 3 21 32 33)(font "Arial" ))
	(port
		(pt 0 16)
		(input)
		(text "IN" (rect 2 7 13 19)(font "Courier New" (bold))(invisible))
		(text "IN" (rect 2 7 13 19)(font "Courier New" (bold))(invisible))
		(line (pt 0 16)(pt 13 16)(line_width 1))
	)
	(port
		(pt 48 16)
		(output)
		(text "OUT" (rect 32 7 49 19)(font "Courier New" (bold))(invisible))
		(text "OUT" (rect 32 7 49 19)(font "Courier New" (bold))(invisible))
		(line (pt 39 16)(pt 48 16)(line_width 1))
	)
	(drawing
		(line (pt 13 25)(pt 13 7)(line_width 1))
		(line (pt 13 7)(pt 31 16)(line_width 1))
		(line (pt 13 25)(pt 31 16)(line_width 1))
		(circle (rect 31 12 39 20)(line_width 1))
	)
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(symbol
	(rect -280 144 -232 176)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst13" (rect 3 21 32 33)(font "Arial" ))
	(port
		(pt 0 16)
		(input)
		(text "IN" (rect 2 7 13 19)(font "Courier New" (bold))(invisible))
		(text "IN" (rect 2 7 13 19)(font "Courier New" (bold))(invisible))
		(line (pt 0 16)(pt 13 16)(line_width 1))
	)
	(port
		(pt 48 16)
		(output)
		(text "OUT" (rect 32 7 49 19)(font "Courier New" (bold))(invisible))
		(text "OUT" (rect 32 7 49 19)(font "Courier New" (bold))(invisible))
		(line (pt 39 16)(pt 48 16)(line_width 1))
	)
	(drawing
		(line (pt 13 25)(pt 13 7)(line_width 1))
		(line (pt 13 7)(pt 31 16)(line_width 1))
		(line (pt 13 25)(pt 31 16)(line_width 1))
		(circle (rect 31 12 39 20)(line_width 1))
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)
(connector
	(pt 256 192)
	(pt 288 192)
)
(connector
	(pt 232 208)
	(pt 288 208)
)
(connector
	(pt 528 56)
	(pt 704 56)
)
(connector
	(pt 512 -112)
	(pt 640 -112)
)
(connector
	(pt 256 8)
	(pt 296 8)
)
(connector
	(pt 256 8)
	(pt 256 192)
)
(connector
	(pt 528 160)
	(pt 592 160)
)
(connector
	(pt 512 176)
	(pt 592 176)
)
(connector
	(pt 440 192)
	(pt 592 192)
	(bus)
)
(connector
	(text "data[12..0]" (rect 831 144 884 156)(font "Arial" ))
	(pt 808 160)
	(pt 864 160)
	(bus)
)
(connector
	(pt 232 120)
	(pt 272 120)
)
(connector
	(pt 256 -112)
	(pt 256 8)
)
(connector
	(pt 168 -112)
	(pt 256 -112)
)
(connector
	(pt 256 -112)
	(pt 512 -112)
)
(connector
	(pt 72 -112)
	(pt 64 -112)
)
(connector
	(pt 232 24)
	(pt 296 24)
)
(connector
	(pt 232 24)
	(pt 232 64)
)
(connector
	(pt -320 0)
	(pt -304 0)
)
(connector
	(pt -312 160)
	(pt -280 160)
)
(connector
	(pt -256 0)
	(pt -120 0)
)
(connector
	(pt -232 160)
	(pt -112 160)
)
(connector
	(pt -16 160)
	(pt -8 160)
)
(connector
	(pt 232 64)
	(pt -8 64)
)
(connector
	(pt -8 64)
	(pt -8 160)
)
(connector
	(pt -8 160)
	(pt -8 216)
)
(connector
	(pt 8 0)
	(pt 8 216)
)
(connector
	(pt 24 288)
	(pt 56 288)
)
(connector
	(pt 24 160)
	(pt 24 288)
)
(connector
	(pt 40 272)
	(pt 56 272)
)
(connector
	(pt 152 272)
	(pt 480 272)
)
(connector
	(pt -24 0)
	(pt 8 0)
)
(connector
	(pt 8 0)
	(pt 40 0)
)
(connector
	(pt 40 144)
	(pt 56 144)
)
(connector
	(pt 40 0)
	(pt 40 144)
)
(connector
	(pt 40 144)
	(pt 40 272)
)
(connector
	(pt -8 160)
	(pt 24 160)
)
(connector
	(pt 24 160)
	(pt 56 160)
)
(connector
	(pt 232 120)
	(pt 232 152)
)
(connector
	(pt 232 152)
	(pt 232 208)
)
(connector
	(pt 528 -24)
	(pt 592 -24)
)
(connector
	(pt 512 -8)
	(pt 592 -8)
)
(connector
	(pt 440 8)
	(pt 592 8)
	(bus)
)
(connector
	(pt 512 -112)
	(pt 512 -8)
)
(connector
	(pt 512 -8)
	(pt 512 176)
)
(connector
	(pt 528 -24)
	(pt 528 56)
)
(connector
	(pt 528 56)
	(pt 528 160)
)
(connector
	(text "f[12..0]" (rect 814 -40 850 -28)(font "Arial" ))
	(pt 808 -24)
	(pt 864 -24)
	(bus)
)
(connector
	(pt 120 152)
	(pt 232 152)
)
(junction (pt 512 -112))
(junction (pt 512 -8))
(junction (pt 528 56))
(junction (pt 256 8))
(junction (pt 256 -112))
(junction (pt -8 160))
(junction (pt 8 0))
(junction (pt 24 160))
(junction (pt 40 144))
(junction (pt 232 152))