I have the following code:
signal busy_condition : std_logic; signal high_registered : std_logic_vector(1 downto 0); signal high_current : std_logic_vector(1 downto 0);
busy_condition CONV_INTEGER(high_registered)) ELSE '0';
During simulation high_registered become "10" and high_current = "00". However busy_condition is high impedence. Is there someone that can explain me what is my error? Thanks a lo Gio
"Giox" a écrit dans le message de news:
Which library do you use? Signed or unsigned? If you use ieee.std_logic_signed.all, the CONV_INTEGER ("10") is a negative number.
Change your library or add a sign bit like this:
busy_condition CONV_INTEGER('0'&high_registered)) ELSE '0';
Dan.
The basic problem is that you are using non-standard libraries to make your code ambiguous. Is "10" a positive number or a negative one?
Using "ieee.numeric_std" you would make the signals in question either signed or unsigned, according to what your code is meant to do, and simplify the expression to
busy_condition high_registered ELSE '0';
- Brian
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