The input PHASE channel can be configured to have no TUSER port, a
user field or to carry the TDM channel index, or both a user field and TDM channel
index. There is no byte orientation to these fields. The TDM channel index, if
configured, has the minimum width required to describe the number of TDM channels. The
width of the user field is determined by user selection from 1 to 256 bits. The two
fields are concatenated with the TDM channel ID field in the least significant place. If
only one field exists, it occupies the least significant bits of
s_axis_phase_tuser.
The following figure shows the three possible combinations; both user field and chan_id field, chan_id field only, and user field only.
Figure 1. Input PHASE Channel TUSER Structure