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Altera_Forum's avatar
Altera_Forum
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12 years ago

Using 7 segment on De1 Board

Hello to every one, I've just bought the DE1 board and i try to do some sample program with VHDL like put led on when switch is on and something similar. I kindly ask you if you can tell m...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

--- Quote Start ---

for assignment a variable to an hardware component, for example an X input with key / sw

is enough do for example:

signal X: KEY[0]

--- Quote End ---

Not quite. There's two ways you could do something like this; 


signal x : std_logic;
-- "Read" the state of key(0) into x
x <= key(0);

or the shorthand version 


alias x is key(0);

Note: VHDL is case insensitive, so writing capitals makes no difference. A typical "convention" is to write generics in capitals, but even that is not universal.

Cheers,

Dave