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Altera_Forum's avatar
Altera_Forum
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16 years ago

Simple Question

Hi all, I am new to VHDL, I have a question, I saw the code with this line a <= X "FF" ; Why they put X" " in front of FF, what's difference with the normal assign operator a <...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

When you have long binary vectors, to be shore you don't mistake some values, and to save time and space, it is recomanded to use hexadecimal values. That's why in your code it is used x"FF" insted of "11111111". It's still a std_logic_vector value.