4_2counter.bdf

是一些很好的FPGA设计实例

		(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))
	)
	(drawing
		(line (pt 12 12)(pt 52 12)(line_width 1))
		(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 192 112 240 144)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst5" (rect 3 21 26 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 480 112 528 144)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst6" (rect 3 21 26 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 336 112 384 144)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst7" (rect 3 21 26 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 632 112 680 144)
	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
	(text "inst8" (rect 3 21 26 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))
	)
)
(connector
	(pt 112 128)
	(pt 104 128)
)
(connector
	(pt 432 192)
	(pt 432 168)
)
(connector
	(pt 288 192)
	(pt 288 168)
)
(connector
	(pt 144 192)
	(pt 144 168)
)
(connector
	(pt 104 192)
	(pt 144 192)
)
(connector
	(pt 144 192)
	(pt 288 192)
)
(connector
	(pt 176 112)
	(pt 184 112)
)
(connector
	(pt 184 128)
	(pt 192 128)
)
(connector
	(pt 240 128)
	(pt 256 128)
)
(connector
	(pt 240 128)
	(pt 240 48)
)
(connector
	(pt 240 48)
	(pt 104 48)
)
(connector
	(pt 104 48)
	(pt 104 112)
)
(connector
	(pt 104 112)
	(pt 112 112)
)
(connector
	(pt 320 112)
	(pt 336 112)
)
(connector
	(pt 384 128)
	(pt 400 128)
)
(connector
	(pt 384 128)
	(pt 384 48)
)
(connector
	(pt 248 48)
	(pt 248 112)
)
(connector
	(pt 248 112)
	(pt 256 112)
)
(connector
	(pt 576 192)
	(pt 576 168)
)
(connector
	(pt 288 192)
	(pt 432 192)
)
(connector
	(pt 432 192)
	(pt 576 192)
)
(connector
	(pt 528 128)
	(pt 544 128)
)
(connector
	(pt 464 112)
	(pt 480 112)
)
(connector
	(pt 528 128)
	(pt 528 48)
)
(connector
	(pt 528 48)
	(pt 392 48)
)
(connector
	(pt 392 48)
	(pt 392 112)
)
(connector
	(pt 392 112)
	(pt 400 112)
)
(connector
	(pt 608 112)
	(pt 632 112)
)
(connector
	(pt 680 128)
	(pt 688 128)
)
(connector
	(pt 688 128)
	(pt 688 40)
)
(connector
	(pt 688 40)
	(pt 544 40)
)
(connector
	(pt 544 40)
	(pt 544 112)
)
(connector
	(pt 248 48)
	(pt 384 48)
)
(connector
	(pt 184 112)
	(pt 184 128)
)
(connector
	(pt 184 16)
	(pt 184 112)
)
(connector
	(pt 336 112)
	(pt 336 128)
)
(connector
	(pt 336 16)
	(pt 336 112)
)
(connector
	(pt 480 112)
	(pt 480 128)
)
(connector
	(pt 480 16)
	(pt 480 112)
)
(connector
	(pt 632 112)
	(pt 632 128)
)
(connector
	(pt 632 16)
	(pt 632 112)
)
(junction (pt 432 192))
(junction (pt 288 192))
(junction (pt 144 192))
(junction (pt 184 112))
(junction (pt 240 128))
(junction (pt 336 112))
(junction (pt 384 128))
(junction (pt 480 112))
(junction (pt 528 128))
(junction (pt 632 112))