Direct Digital Synthesis (DDS), the best use of the digital frequency generator step method, the code I am personally prepared for electronic design contest that year. Attention which has modules for single-chip communication, you can use to download to the chip, only learning to use!

Packet : 101259341mydds.rar filelist
mydds
mydds\triproc.vhdl
mydds\clk_gen.vhdl
mydds\dds.sch
mydds\ddsproc.vhdl
mydds\mux.vhdl
mydds\rom_sin.coe
mydds\rom_squa.coe
mydds\rom_tri.coe
mydds\shift.vhdl
mydds\sinproc.vhdl
mydds\squaproc.vhdl

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