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Altera_Forum
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17 years ago

Signal has no source

Hi All! When i compile the following code: (Quartus) entity ISA is port --from ISA to CPU (AEN_IN,IOR_IN,IOW_IN :inout std_logic; ADDR_IN : inout std_logic_vector(10 downto 0); ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Yes, DATA_IN is a bi-directional signal but you don't get a "Signal has no source" warning about DATA_IN.

The warnings about DATA_IN simply say that the signal is never tri-stated so it's tri-state buffer is always enabled.