I understand your confusion regarding the width settings in Quartus Prime. Allow me to address your questions:
1. In Quartus Prime, each address is typically represented as a byte. So, when you refer to 0x1, it would indeed be 8 bits (1 byte) instead of 1 bit. This is because the standard unit of storage and transfer in Quartus Prime is a byte.
2. In the context of the HPS (Hard Processor System), the AXI bridge data width refers to the width of the data bus used for transferring data between the HPS and the AXI bus. For example, if the bridge data width is set to 128 bits, it means that the bridge can transfer 128 bits of data per pulse or per transaction.
3. In the Avalon MM bridge, the "Data Width" parameter represents the width of the data bus used for transferring data between the Avalon MM bus and the IP core. "Symbol Width" is basically the size of your base unit of data - in this case it is in bytes so it would typically be 8-bit.
4. You would need to consider the data width and symbol width of your Avalon MM bus and the AXI bridge to ensure compatibility and efficient data transfer. I do not have the answer for the best settings for these two parameters, you will need to set the necessary parameters for the bridges according to your design requirement.
You may checkout this how-to video on how to deal with AXI bridge and Avalon bridge. https://www.youtube.com/watch?v=LdD2B1x-5vo
5. If the slave is an on-chip memory, it can be the same as the Avalon MM pipeline bridge or the AXI interface, depending on how you configure the memory and the bus connections in your design. For further information, you may checkout the user guide here:
https://www.intel.com/content/www/us/en/docs/programmable/683130/23-1/size-82488.html
I hope this helps clarify most of your questions.
If you have any further questions, please feel free to ask.
Best Regards,
Richard Tan
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