Altera Avalon MM Read Master Template: max transfer length of 20 bytes?

Hi everyone,

I have sucessfully integrated the Altera Avalon MM Read Master template. 
However, this only works properly up to the length of 20. (word size is 
32 bit)

When I define the transfer length to be 24, i.e. 6 words, then there are 
only 5 dataavailable assertions with 5 buffered data. What I find 
interesting is, that the signal early_done does get asserted, meaning 
the last read is actually posted, but the signal done is never asserted, 
so somehow the result cannot be returned.

I already used a FIFO of size 64, so should be big enough I think.

Is this a known issue? Or anyone an idea what the problem could be?

Best regards,
Jimmy