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LudoFd's avatar
LudoFd
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5 years ago
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Compilation Error on Quartus 20.1 Lite

Hello I can't handle a ccompilation Error on Quartus 20.1 Lite. As you can see in the screenshot. Quartus have some problem with my code at the line74. I'm declaring an unresolved s...
  • sstrell's avatar
    sstrell
    5 years ago

    I think you're supposed to use shift_right instead of sra.

sstrell's avatar
sstrell
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5 years ago

What is u_unsigned? Do you mean to_unsigned?

LudoFd's avatar
LudoFd
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5 years ago

It's the alias for unresolved unsigned.

Here is the declaration of this type in the quartus numeric_std package as i found it in the file numeric_std_vhdl2008 from quatus vhdl library file:

type UNRESOLVED_UNSIGNED is array (NATURAL range <>) of STD_ULOGIC;
type UNRESOLVED_SIGNED is array (NATURAL range <>) of STD_ULOGIC;

alias U_UNSIGNED is UNRESOLVED_UNSIGNED;
alias U_SIGNED is UNRESOLVED_SIGNED;

subtype UNSIGNED is (resolved) UNRESOLVED_UNSIGNED;
subtype SIGNED is (resolved) UNRESOLVED_SIGNED;

I have the same error even if I used the complete type name instead of the alias