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CLyna's avatar
CLyna
Icon for New Contributor rankNew Contributor
7 years ago

Hey, guys, I am trying to understand this piece of code any help would be great

rotW <= w(3)(23 downto 0) & w(3)(31 downto 24); subRotW(8*(i+1)-1 downto 8*i) <= subKey(conv_integer(rotW(8*(i+1)-1 downto 8*i))); I know that rotW is being populated by the values from w backwards...
Vicky1's avatar
Vicky1
Icon for Regular Contributor rankRegular Contributor
7 years ago

Hi,

By looking at the second line, it should execute as you mentioned because the "conv_integer" function converts an argument of type integer,unsigned, signed or std_ulogic to an integer return value. This function also has limitation range corresponds to 31 bit unsigned value or signed value, it can`t convert an argument outside of this range.

Regards,

Vikas