Vhdl _ To_Integer
I'm Confused About a Problem I Have in Vhdl. I Make One Vga_Display_ Characters, So I Wanna Convert Some Std_Logic_Vectors into Integer by To_Integer Unsigned...
I'm confused about a problem I have in VHDL.
I make one VGA_display_ characters, so I wanna convert some std_logic_vectors into integer by to_integer unsigned, then I wanna recuperate,
in this way I can't use those libraries in the same time.
ieee.std_logic_arith.all and ieee.numeric_std.all
The error given by quartus:
(Error (10621): VHDL Use Clause error at interface.vhd(34): more than one Use Clause imports a declaration of simple name "unsigned" -- none of the declarations are directly visible Error (10784): HDL error at syn_arit.vhd(26): see declaration for object "unsigned" bellow my code :
1 Answer
My advice is: don't use ieee.std_logic_arith. It's proprietary (not officially part of VHDL) and causes far, far more problems than it solves.
Use only numeric_std and you can do everything you need:
to_integer(unsigned(X)) and to_integer(signed(X)), where X is an std_logic_vector.
To convert back in the other direction:
std_logic_vector(to_unsigned(K, N)) and std_logic_vector(to_signed(K, N)) where K is the integer to convert and N is the number of bits.
David Miller brings 15 years of experience in global economics, personal finance strategy, and market dynamics. He specializes in turning complex economic trends into actionable insights for everyday readers.
