AD9375 external ORx attenuator

Hi there,

We're using an external digital step attenuator on an ORx input of our AD9375 based design, but I'm struggling to find conclusive information on interfacing this:

The user guide (UG-992) states that the external attenuator control pins for ORx are GPIO_3P3_11 to GPIO_3P3_7 however this is 5 bits - the control word is 4 bits. Should this be 8 to 11 instead? Presumably the MSB would be GPIO_3P3_11?

Many thanks in advance,