lpm_conter8.bsf

主要是通过Altera公司的Cuclone系列的FPGA-EP1C3T144C8产生余弦波的源代码 基于LPM-ROM余弦波一周期含有256个10位数据；

/*
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 "symbol" (version "1.1"))
(symbol
	(rect 0 0 144 96)
	(text "lpm_conter8" (rect 37 1 120 17)(font "Arial" (font_size 10)))
	(text "inst" (rect 8 80 25 92)(font "Arial" ))
	(port
		(pt 0 32)
		(input)
		(text "clock" (rect 0 0 29 14)(font "Arial" (font_size 8)))
		(text "clock" (rect 26 26 49 39)(font "Arial" (font_size 8)))
		(line (pt 0 32)(pt 16 32)(line_width 1))
	)
	(port
		(pt 0 48)
		(input)
		(text "clk_en" (rect 0 0 36 14)(font "Arial" (font_size 8)))
		(text "clk_en" (rect 20 42 50 55)(font "Arial" (font_size 8)))
		(line (pt 0 48)(pt 16 48)(line_width 1))
	)
	(port
		(pt 80 96)
		(input)
		(text "aclr" (rect 0 0 14 21)(font "Arial" (font_size 8))(vertical))
		(text "aclr" (rect 73 59 86 76)(font "Arial" (font_size 8))(vertical))
		(line (pt 80 96)(pt 80 80)(line_width 1))
	)
	(port
		(pt 144 40)
		(output)
		(text "q[7..0]" (rect 0 0 35 14)(font "Arial" (font_size 8)))
		(text "q[7..0]" (rect 95 34 125 47)(font "Arial" (font_size 8)))
		(line (pt 144 40)(pt 128 40)(line_width 3))
	)
	(drawing
		(text "up counter" (rect 84 17 128 29)(font "Arial" ))
		(line (pt 16 16)(pt 128 16)(line_width 1))
		(line (pt 128 16)(pt 128 80)(line_width 1))
		(line (pt 128 80)(pt 16 80)(line_width 1))
		(line (pt 16 80)(pt 16 16)(line_width 1))
		(line (pt 16 26)(pt 22 32)(line_width 1))
		(line (pt 22 32)(pt 16 38)(line_width 1))
	)
)