DPI pins to High-Z state

I am working on ADSP-21469 processor. I would like to know a way to set  DPI pins to High-Z state without resetting the processor.

Initially I will be using as output but based on the requirement need to change back and forth to High-Z state

I understand this can be done by DPI_PBEN13_I but not sure how. Is there any SRU macro that disconnect the enable signal from pin buffer circuitry?

Initialization of the  PIN as OUTPUT

============================

    SRU(FLAG7_O,DPI_PB13_I);

    SRU(HIGH,DPI_PBEN13_I);   

    sysreg_bit_set( sysreg_FLAGS, FLG7O );

set and clear

==========

   sysreg_bit_clr

Appreciate your help in this regard.