Avalon 8 bit with Nios 32 bit possible?

Byte-enables are usually used during writes, asserting all high for writing words, partly for halfword and byte.

Nios does toggle the byteenable for reads but it stills reads 32-bit word. The byteenable can be used by the slave for byte-lane enabling depending on the slave use case. For example, the Onchip-Memory uses byte-enable for word/partial write but always returns 32-bit data for read.

Qsys interconnect should help to perform data width adaptation to match the master-slave interfaces.