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Altera_Forum's avatar
Altera_Forum
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13 years ago

Cyclone III -- IO port in VHDL help

I'm writing a small code to simulate the I2C. In VHDL, the "sda_io" is defined as an IO port. I thought this simple statement should work: sda_io <= '0' when drive_sda = '1' else (other => '...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

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It's a VHDL newbie mistake, this statement works:

--- sda_io <= '0' when drive_sda = '1' else 'Z'; ---

I still wish to know where and how to find the Altera's equivalent components of Xilinx's IBUF and OBUFE to instantiate in the design.

Thanks for your help.

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you only need to use inout for the sda_io