addsub16.bsf

这是用python语言写的一个数字广播的信号处理工具包。利用它

/*
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) 1991-2003 Altera Corporation
Any  megafunction  design,  and related netlist (encrypted  or  decrypted),
support information,  device programming or simulation file,  and any other
associated  documentation or information  provided by  Altera  or a partner
under  Altera's   Megafunction   Partnership   Program  may  be  used  only
to program  PLD  devices (but not masked  PLD  devices) from  Altera.   Any
other  use  of such  megafunction  design,  netlist,  support  information,
device programming or simulation file,  or any other  related documentation
or information  is prohibited  for  any  other purpose,  including, but not
limited to  modification,  reverse engineering,  de-compiling, or use  with
any other  silicon devices,  unless such use is  explicitly  licensed under
a separate agreement with  Altera  or a megafunction partner.  Title to the
intellectual property,  including patents,  copyrights,  trademarks,  trade
secrets,  or maskworks,  embodied in any such megafunction design, netlist,
support  information,  device programming or simulation file,  or any other
related documentation or information provided by  Altera  or a megafunction
partner, remains with Altera, the megafunction partner, or their respective
licensors. No other licenses, including any licenses needed under any third
party's intellectual property, are provided herein.
*/
(header "symbol" (version "1.1"))
(symbol
	(rect 0 0 160 144)
	(text "addsub16" (rect 45 2 128 21)(font "Arial" (font_size 10)))
	(text "inst" (rect 8 125 31 140)(font "Arial" ))
	(port
		(pt 0 56)
		(input)
		(text "dataa[15..0]" (rect 0 0 81 16)(font "Arial" (font_size 8)))
		(text "dataa[15..0]" (rect 4 40 73 56)(font "Arial" (font_size 8)))
		(line (pt 0 56)(pt 64 56)(line_width 3))
	)
	(port
		(pt 0 88)
		(input)
		(text "datab[15..0]" (rect 0 0 81 16)(font "Arial" (font_size 8)))
		(text "datab[15..0]" (rect 4 72 73 88)(font "Arial" (font_size 8)))
		(line (pt 0 88)(pt 64 88)(line_width 3))
	)
	(port
		(pt 0 72)
		(input)
		(text "clock" (rect 0 0 36 16)(font "Arial" (font_size 8)))
		(text "clock" (rect 4 56 35 72)(font "Arial" (font_size 8)))
		(line (pt 0 72)(pt 64 72)(line_width 1))
	)
	(port
		(pt 0 32)
		(input)
		(text "add_sub" (rect 0 0 57 16)(font "Arial" (font_size 8)))
		(text "add_sub" (rect 4 16 53 32)(font "Arial" (font_size 8)))
		(line (pt 0 32)(pt 80 32)(line_width 1))
	)
	(port
		(pt 0 112)
		(input)
		(text "clken" (rect 0 0 36 16)(font "Arial" (font_size 8)))
		(text "clken" (rect 4 96 35 112)(font "Arial" (font_size 8)))
		(line (pt 0 112)(pt 74 112)(line_width 1))
	)
	(port
		(pt 0 128)
		(input)
		(text "aclr" (rect 0 0 24 16)(font "Arial" (font_size 8)))
		(text "aclr" (rect 4 112 25 128)(font "Arial" (font_size 8)))
		(line (pt 0 128)(pt 85 128)(line_width 1))
	)
	(port
		(pt 160 72)
		(output)
		(text "result[15..0]" (rect 0 0 81 16)(font "Arial" (font_size 8)))
		(text "result[15..0]" (rect 88 56 157 72)(font "Arial" (font_size 8)))
		(line (pt 160 72)(pt 96 72)(line_width 3))
	)
	(drawing
		(text "A" (rect 66 48 75 64)(font "Arial" (font_size 8)))
		(text "B" (rect 66 80 75 96)(font "Arial" (font_size 8)))
		(text "A+B/A-B" (rect 82 37 134 53)(font "Arial" (font_size 8)))
		(line (pt 64 48)(pt 96 56)(line_width 1))
		(line (pt 96 56)(pt 96 88)(line_width 1))
		(line (pt 96 88)(pt 64 96)(line_width 1))
		(line (pt 64 96)(pt 64 48)(line_width 1))
		(line (pt 80 32)(pt 80 52)(line_width 1))
		(line (pt 106 40)(pt 125 40)(line_width 1))
		(line (pt 74 112)(pt 74 93)(line_width 1))
		(line (pt 85 128)(pt 85 90)(line_width 1))
		(line (pt 64 66)(pt 70 72)(line_width 1))
		(line (pt 70 72)(pt 64 78)(line_width 1))
	)
)