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NIOS GPIO and Metastability question

Altera_Forum
Honored Contributor II
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Hi everyone! 

 

Just a simple confirmation. 

We had implemented an NIOS project with some GPIOs (the ones provided in QSYS) 

The interfaces are asynchronous respect to the internal clock domain. 

 

I assume initially that the input IPs for the NIOS had a double flipflop but looking at the RTL netlist I notice that there is combinatorial logic already at the input or after the first flip flop. :-/ 

 

So the NIOS GPIO is done basically for syncronous interfaces with the NIOS Clock and i case of asyncronous it is expect that the desinger manage the resampling for metastability outside? 

 

Is my assumption correct? 

 

thanks in advance 

Ale
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