16-Bit I2S data on ADAU145x/146x


I've tried to use the Serial Port for a 2x 16-Bit interface to another chip. The serial port is a slave configuration.

But when I set the dropdown list to "2 channels / 16 bit/channel" the graphic in the lower right corner shows only 1 channel instead of 2.

The datasheet on page 71 shows also 2 channels with 16 Bit each.

What's the reason for this?

Is it only a issue with Sigma Studio and I do get 2 channels?