Basic question

[Altera_Forum]

Learning Quartus II: When I create a schematic sub-block in the main schematic block design file, the compiler will not recognize connections in or out of the sub block. I have named the signals in and our the same, but no luck?

[Altera_Forum]

--- Quote Start ---  Learning Quartus II: When I create a schematic sub-block in the main schematic block design file, the compiler will not recognize connections in or out of the sub block. I have named the signals in and our the same, but no luck?  --- Quote End ---    Hi,  can you post your bdf-file ?  Kind regards  GPK

[Altera_Forum]

Hello Pletz, 

Thanks for replying, here is the project in zip file which produces the compilation error.   This is a simple project consisting of an input pin, connected to a sub-block that contains a nand gate, then back to an output pin.  Thanks, Arthur

[Altera_Forum]

In your top schematic, you have an empty sub-block, not the intended subblock-schematic. You have to insert the correct sub-block or rename the "block_name" block. 

 P.S.: Your sub-block has no in- and output ports. So it can't be connected.

[Altera_Forum]

:) Thanks, FvM, I'm on my way for now.