key_prog.bdf

简单易懂的4*4键盘扫描及显示程序。对编写其他形式的键盘扫描程序有一定的指导意义.

/*
WARNING: Do NOT edit the input and output ports in this file in a text
editor if you plan to continue editing the block that represents it in
the Block Editor! File corruption is VERY likely to occur.
*/
/*
Copyright (C) 1991-2005 Altera Corporation
Your use of Altera Corporation's design tools, logic functions 
and other software and tools, and its AMPP partner logic       
functions, and any output files any of the foregoing           
(including device programming or simulation files), and any    
associated documentation or information are expressly subject  
to the terms and conditions of the Altera Program License      
Subscription Agreement, Altera MegaCore Function License       
Agreement, or other applicable license agreement, including,   
without limitation, that your use is for the sole purpose of   
programming logic devices manufactured by Altera and sold by   
Altera or its authorized distributors.  Please refer to the    
applicable agreement for further details.
*/
(header "graphic" (version "1.3"))
(pin
	(input)
	(rect -136 192 32 208)
	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
	(text "clk" (rect 5 0 19 12)(font "Arial" ))
	(pt 168 8)
	(drawing
		(line (pt 92 12)(pt 117 12)(line_width 1))
		(line (pt 92 4)(pt 117 4)(line_width 1))
		(line (pt 121 8)(pt 168 8)(line_width 1))
		(line (pt 92 12)(pt 92 4)(line_width 1))
		(line (pt 117 4)(pt 121 8)(line_width 1))
		(line (pt 117 12)(pt 121 8)(line_width 1))
	)
	(text "VCC" (rect 136 7 156 17)(font "Arial" (font_size 6)))
)
(pin
	(input)
	(rect -136 280 32 296)
	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
	(text "key_out[3..0]" (rect 5 0 71 12)(font "Arial" ))
	(pt 168 8)
	(drawing
		(line (pt 92 12)(pt 117 12)(line_width 1))
		(line (pt 92 4)(pt 117 4)(line_width 1))
		(line (pt 121 8)(pt 168 8)(line_width 1))
		(line (pt 92 12)(pt 92 4)(line_width 1))
		(line (pt 117 4)(pt 121 8)(line_width 1))
		(line (pt 117 12)(pt 121 8)(line_width 1))
	)
	(text "VCC" (rect 136 7 156 17)(font "Arial" (font_size 6)))
)
(pin
	(output)
	(rect 232 80 408 96)
	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
	(text "key_in[3..0]" (rect 90 0 149 12)(font "Arial" ))
	(pt 0 8)
	(drawing
		(line (pt 0 8)(pt 52 8)(line_width 1))
		(line (pt 52 4)(pt 78 4)(line_width 1))
		(line (pt 52 12)(pt 78 12)(line_width 1))
		(line (pt 52 12)(pt 52 4)(line_width 1))
		(line (pt 78 4)(pt 82 8)(line_width 1))
		(line (pt 82 8)(pt 78 12)(line_width 1))
		(line (pt 78 12)(pt 82 8)(line_width 1))
	)
)
(pin
	(output)
	(rect 568 104 744 120)
	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
	(text "soeplay[6..0]" (rect 90 0 154 12)(font "Arial" ))
	(pt 0 8)
	(drawing
		(line (pt 0 8)(pt 52 8)(line_width 1))
		(line (pt 52 4)(pt 78 4)(line_width 1))
		(line (pt 52 12)(pt 78 12)(line_width 1))
		(line (pt 52 12)(pt 52 4)(line_width 1))
		(line (pt 78 4)(pt 82 8)(line_width 1))
		(line (pt 82 8)(pt 78 12)(line_width 1))
		(line (pt 78 12)(pt 82 8)(line_width 1))
	)
)
(symbol
	(rect 416 168 552 264)
	(text "display" (rect 5 0 40 12)(font "Arial" ))
	(text "inst" (rect 8 80 25 92)(font "Arial" ))
	(port
		(pt 0 32)
		(input)
		(text "clk" (rect 0 0 14 12)(font "Arial" ))
		(text "clk" (rect 21 27 35 39)(font "Arial" ))
		(line (pt 0 32)(pt 16 32)(line_width 1))
	)
	(port
		(pt 0 48)
		(input)
		(text "data[3..0]" (rect 0 0 47 12)(font "Arial" ))
		(text "data[3..0]" (rect 21 43 68 55)(font "Arial" ))
		(line (pt 0 48)(pt 16 48)(line_width 3))
	)
	(port
		(pt 136 32)
		(output)
		(text "q[6..0]" (rect 0 0 31 12)(font "Arial" ))
		(text "q[6..0]" (rect 84 27 115 39)(font "Arial" ))
		(line (pt 136 32)(pt 120 32)(line_width 3))
	)
	(drawing
		(rectangle (rect 16 16 120 80)(line_width 1))
	)
)
(symbol
	(rect 56 168 152 264)
	(text "key_scan" (rect 5 0 53 12)(font "Arial" ))
	(text "inst2" (rect 8 80 31 92)(font "Arial" ))
	(port
		(pt 0 32)
		(input)
		(text "clk" (rect 0 0 14 12)(font "Arial" ))
		(text "clk" (rect 21 27 35 39)(font "Arial" ))
		(line (pt 0 32)(pt 16 32)(line_width 1))
	)
	(port
		(pt 96 32)
		(output)
		(text "pin[3..0]" (rect 0 0 40 12)(font "Arial" ))
		(text "pin[3..0]" (rect 35 27 75 39)(font "Arial" ))
		(line (pt 96 32)(pt 80 32)(line_width 3))
	)
	(drawing
		(rectangle (rect 16 16 80 80)(line_width 1))
	)
)
(symbol
	(rect 200 168 352 264)
	(text "key_out" (rect 5 0 45 12)(font "Arial" ))
	(text "inst4" (rect 8 80 31 92)(font "Arial" ))
	(port
		(pt 0 32)
		(input)
		(text "clk" (rect 0 0 14 12)(font "Arial" ))
		(text "clk" (rect 21 27 35 39)(font "Arial" ))
		(line (pt 0 32)(pt 16 32)(line_width 1))
	)
	(port
		(pt 0 48)
		(input)
		(text "scan_out[3..0]" (rect 0 0 70 12)(font "Arial" ))
		(text "scan_out[3..0]" (rect 21 43 91 55)(font "Arial" ))
		(line (pt 0 48)(pt 16 48)(line_width 3))
	)
	(port
		(pt 152 32)
		(output)
		(text "q[3..0]" (rect 0 0 31 12)(font "Arial" ))
		(text "q[3..0]" (rect 100 27 131 39)(font "Arial" ))
		(line (pt 152 32)(pt 136 32)(line_width 3))
	)
	(drawing
		(rectangle (rect 16 16 136 80)(line_width 1))
	)
)
(connector
	(pt 56 200)
	(pt 32 200)
)
(connector
	(pt 32 144)
	(pt 32 200)
)
(connector
	(pt 416 200)
	(pt 400 200)
)
(connector
	(pt 400 200)
	(pt 400 144)
)
(connector
	(pt 384 216)
	(pt 416 216)
	(bus)
)
(connector
	(pt 152 200)
	(pt 160 200)
	(bus)
)
(connector
	(pt 352 200)
	(pt 384 200)
	(bus)
)
(connector
	(pt 384 200)
	(pt 384 216)
	(bus)
)
(connector
	(pt 32 288)
	(pt 184 288)
	(bus)
)
(connector
	(pt 200 216)
	(pt 184 216)
	(bus)
)
(connector
	(pt 184 216)
	(pt 184 288)
	(bus)
)
(connector
	(pt 232 88)
	(pt 160 88)
	(bus)
)
(connector
	(pt 160 88)
	(pt 160 200)
	(bus)
)
(connector
	(pt 552 200)
	(pt 568 200)
	(bus)
)
(connector
	(pt 568 200)
	(pt 568 112)
	(bus)
)
(connector
	(pt 200 200)
	(pt 192 200)
)
(connector
	(pt 192 200)
	(pt 192 144)
)
(connector
	(pt 32 144)
	(pt 192 144)
)
(connector
	(pt 192 144)
	(pt 400 144)
)
(junction (pt 32 200))
(junction (pt 192 144))