SOPC Builder, VIP control, SPI

You have a few options:

1 - Use SoPC Builder. Create an Avalon MM Master component that will take in your SPI commands and convert them to avalon reads and writes to write to your components. You could also do the SPI decoding outside SoPC builder and just export an Avalon MM Master port outside SoPC builder that you can read/write.

2 - Don't use SoPC builder. If you're not using a NIOS, you can certainly use the VIP without SoPC builder. Then you just come up with your own scheme for reading/writing the avalon slave ports on the various components. This would be my first choice in your case.

3 - Use a NIOS. In your case, this would be my last choice.

Jake