Passing channel to Avalon-ST demultiplexer

The input to the demux should have a channel signal so that the demux and de-interleave the data to various outputs. For example if you sent a stream of data like this:

Data      Channel
1            0
3            0
5            1
8            0

You should expect to see 1, 3, 8 come out of the first demux output and 5 come out of the second demux output. If you are looking for a demux that can take a channel-less input stream and route it to whatever port you want take a look at the Qsys tutorial, there is an IP core in there that takes a stream of data in and routes it to output A or B depending on which output you select through the slave port. I forget what I called it but it's something like "one_to_two_st_demux".