Direction of the physical pins of the indexed Streaming Port. 
- Enumerator: 
- 
| UCS_STREAM_PORT_OPT_IN_OUT | Two serial interface pins are available; one for direction IN and one for direction OUT.  |  | UCS_STREAM_PORT_OPT_DUAL_IN | Tow serial interface pins are available for direction IN.  |  | UCS_STREAM_PORT_OPT_DUAL_OUT | Tow serial interface pins are available for direction OUT.  |