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!

mydds
.....\clk_gen.vhdl
.....\dds.sch
.....\ddsproc.vhdl
.....\mux.vhdl
.....\rom_sin.coe
.....\rom_squa.coe
.....\rom_tri.coe
.....\shift.vhdl
.....\sinproc.vhdl
.....\squaproc.vhdl
.....\triproc.vhdl

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