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Altera_Forum
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18 years ago

Inferring a ROM

Has anyone used a HEX (Intel format) file to infer a ROM? I'd like to build a look-up table for waveform generation using a 32768 x 16 ROM and would prefer not to type in all of the values manually....
Altera_Forum's avatar
Altera_Forum
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18 years ago

Hi Frank, thanks for the info. I like the init function to infer the ROM, but I have one question;

Do you use the same commands in the init version's for loop that was used in the generate version's for loop?

Specifically ...

FOR idx in 0 TO ROMSIZE-1

CONSTANT x: REAL := SIN(real(idx)*MATH_PI/real(ROMSIZE));

CONSTANT xn: UNSIGNED (NNCO-2 DOWNTO 0) := CONV_UNSIGNED(INTEGER(x*real(ROMMAX)),NNCO-1);

Thanks,

Brian