counter.bsf

这是一个定时比较器

/*
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) 1991-2007 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 from 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 "symbol" (version "1.1"))
(symbol
	(rect 16 16 232 176)
	(text "counter" (rect 5 0 41 12)(font "Arial" ))
	(text "inst" (rect 8 144 25 156)(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 "a1" (rect 0 0 11 12)(font "Arial" ))
		(text "a1" (rect 21 43 32 55)(font "Arial" ))
		(line (pt 0 48)(pt 16 48)(line_width 1))
	)
	(port
		(pt 0 64)
		(input)
		(text "a2" (rect 0 0 11 12)(font "Arial" ))
		(text "a2" (rect 21 59 32 71)(font "Arial" ))
		(line (pt 0 64)(pt 16 64)(line_width 1))
	)
	(port
		(pt 0 80)
		(input)
		(text "a3" (rect 0 0 11 12)(font "Arial" ))
		(text "a3" (rect 21 75 32 87)(font "Arial" ))
		(line (pt 0 80)(pt 16 80)(line_width 1))
	)
	(port
		(pt 0 96)
		(input)
		(text "en" (rect 0 0 11 12)(font "Arial" ))
		(text "en" (rect 21 91 32 103)(font "Arial" ))
		(line (pt 0 96)(pt 16 96)(line_width 1))
	)
	(port
		(pt 0 112)
		(input)
		(text "duty_load[15..0]" (rect 0 0 80 12)(font "Arial" ))
		(text "duty_load[15..0]" (rect 21 107 101 119)(font "Arial" ))
		(line (pt 0 112)(pt 16 112)(line_width 3))
	)
	(port
		(pt 216 32)
		(output)
		(text "new_duty[15..0]" (rect 0 0 79 12)(font "Arial" ))
		(text "new_duty[15..0]" (rect 116 27 195 39)(font "Arial" ))
		(line (pt 216 32)(pt 200 32)(line_width 3))
	)
	(drawing
		(rectangle (rect 16 16 200 144)(line_width 1))
	)
)