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no idea what the two bit byte enable could be for?
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The byte-enable controls allow you to write to a single byte. Eg., if you have a 16-bit Avalon-MM master, you can write 16-bits, write to the low 8-bits, or write to the high 8-bits. If you have a 32-bit Avalon-MM master, then you can write 32-bits, 16-bits low or high, or any of the four bytes. The byte enables allow you to indicate which bytes get written. The SDRAM controller then passes these though to assert the data mask signals (DQM ).
Again, this is a question that you can answer yourself by creating a simulation of the design.
HINT HINT: Create a simulation! :)
Cheers,
Dave
Honored Contributor
