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Altera_Forum
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16 years ago

[VHDL] Problem with signal type "std_logic_vector(0 downto 0)"

Hello, I use IP module, where data bus width is set to '1'. In VHDL code it is declared as type "std_logic_vector(0 downto 0)", but for compiler this is not the same as "std_logic", type of sig...
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Altera_Forum
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16 years ago

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It's working. I tried data(0 downto 0) and it failed, but data(0) is ok.

Thanks!

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That is because data(0 downto 0) returns a std_logic_vector of length 1. data(0) returns a std_logic

VHDL is strongly typed so it wont let you connect incorrect types without converting them properly.