Avalon SPI Interface with QSYS

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Hugo17

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Following simple question:

When I add a SPI 3-wire serial interface in QSYS I can set several parameters like: Type, clock speed, data width etc..
So why do I need those parameters when I setup the SPI interface directly in VHDL? In other words, are those parameters only
valid when I this interface with a NIOS?

Thanks!
 

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