ff.bdf

是一些很好的FPGA设计实例

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		(text "CLRN" (rect 21 58 44 70)(font "Courier New" (bold)))
		(line (pt 32 80)(pt 32 76)(line_width 1))
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		(line (pt 0 24)(pt 12 24)(line_width 1))
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		(pt 0 40)
		(input)
		(text "CLK" (rect 2 28 19 40)(font "Courier New" (bold))(invisible))
		(text "CLK" (rect 2 28 19 40)(font "Courier New" (bold))(invisible))
		(line (pt 0 40)(pt 12 40)(line_width 1))
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	(port
		(pt 64 24)
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		(text "Q" (rect 45 20 50 32)(font "Courier New" (bold)))
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	(text "DFF" (rect 1 0 19 10)(font "Arial" (font_size 6)))
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	(port
		(pt 32 80)
		(input)
		(text "CLRN" (rect 21 59 44 71)(font "Courier New" (bold)))
		(text "CLRN" (rect 21 58 44 70)(font "Courier New" (bold)))
		(line (pt 32 80)(pt 32 76)(line_width 1))
	)
	(port
		(pt 0 40)
		(input)
		(text "CLK" (rect 3 29 20 41)(font "Courier New" (bold))(invisible))
		(text "CLK" (rect 3 29 20 41)(font "Courier New" (bold))(invisible))
		(line (pt 0 40)(pt 12 40)(line_width 1))
	)
	(port
		(pt 0 24)
		(input)
		(text "D" (rect 14 20 19 32)(font "Courier New" (bold)))
		(text "D" (rect 14 20 19 32)(font "Courier New" (bold)))
		(line (pt 0 24)(pt 12 24)(line_width 1))
	)
	(port
		(pt 32 0)
		(input)
		(text "PRN" (rect 24 13 41 25)(font "Courier New" (bold)))
		(text "PRN" (rect 24 11 41 23)(font "Courier New" (bold)))
		(line (pt 32 4)(pt 32 0)(line_width 1))
	)
	(port
		(pt 64 24)
		(output)
		(text "Q" (rect 45 20 50 32)(font "Courier New" (bold)))
		(text "Q" (rect 45 20 50 32)(font "Courier New" (bold)))
		(line (pt 52 24)(pt 64 24)(line_width 1))
	)
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		(line (pt 12 68)(pt 52 68)(line_width 1))
		(line (pt 52 68)(pt 52 12)(line_width 1))
		(line (pt 12 68)(pt 12 12)(line_width 1))
		(line (pt 19 40)(pt 12 47)(line_width 1))
		(line (pt 12 32)(pt 20 40)(line_width 1))
		(circle (rect 28 4 36 12)(line_width 1))
		(circle (rect 28 68 36 76)(line_width 1))
	)
)
(symbol
	(rect 312 64 360 96)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst19" (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))
	)
)
(symbol
	(rect 320 160 368 192)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst20" (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))
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	(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 328 256 376 288)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst21" (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))
	)
)
(symbol
	(rect 336 352 384 384)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst22" (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))
	)
)
(symbol
	(rect 264 -24 280 8)
	(text "VCC" (rect 6 7 16 27)(font "Arial" (font_size 6))(vertical))
	(text "inst23" (rect -1 3 11 32)(font "Arial" )(vertical)(invisible))
	(port
		(pt 0 16)
		(output)
		(text "1" (rect 19 7 24 19)(font "Courier New" (bold))(invisible))
		(text "1" (rect -3 19 9 24)(font "Courier New" (bold))(vertical)(invisible))
		(line (pt 0 16)(pt 8 16)(line_width 1))
	)
	(drawing
		(line (pt 8 8)(pt 8 24)(line_width 1))
	)
	(rotate270)
)
(connector
	(pt 176 80)
	(pt 80 80)
)
(connector
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)
(connector
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)
(connector
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)
(connector
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(connector
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)
(connector
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)
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)
(connector
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(connector
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)
(connector
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)
(connector
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(connector
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(connector
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(connector
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(connector
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(connector
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	(pt 248 408)
)
(connector
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)
(connector
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)
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(junction (pt 248 -8))
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