DM8168 HDMI audio channel status bits

In our application, we supply the DM8168 HDMI wrapper's audio FIFO with 16bit/sample PCM data, encoded at 48KHz.  I understand the HDMI core converts this data to  IEC 61937/IEC 60958 format prior to transmission to the sink.  I've noticed that the 60958 channel status bits indicate the sample rate to be 44.1KHz instead.  Our values for TMDS = 148500, N = 6144, CTS = 148500.  

How can I configure the HDMI core to generate channel status bits indicating the correct 48KHz sample rate?

Thanks,

Stu