The sine_rom.vhd module uses block RAM as read-only memory (ROM) to store the sample points of a full sine wave. The X and Y-axes precision of the sine wave is configurable through generics.
In addition to the ModelSim testbench, the Zip contains an example implementation for the Lattice iCEstick FPGA board. The demo design uses PWM to pulse an LED on the iCEstick with sine wave intensity, creating a smooth LED breathing effect.
entity sine_rom is generic ( addr_bits : integer range 1 to 30; data_bits : integer range 1 to 31 ); port ( clk : in std_logic; addr : in unsigned(addr_bits - 1 downto 0); data : out unsigned(data_bits - 1 downto 0) ); end sine_rom;
Click here to read more about how I created this module:
How to create a breathing LED effect using a sine wave stored in block RAM
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