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Altera_Forum's avatar
Altera_Forum
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12 years ago

calculate 64 bit unsigned

hi, i've implemented a nco megafunction with a 64 bit phase accumulator in order to obtain very high precision output frequencies. Now to be able to program externally (by microcontroller for ex...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

looks like this will work (not a function) 


constant fo:unsigned(31 downto 0) := x"11110000";
constant fclk : unsigned(31 downto 0) := x"ffff0000";
constant temp: unsigned(95 downto 0) := fo & x"0000000000000000";
constant phase : unsigned(95 downto 0) := temp/fclk;

then choose 64 bits of phase