TMS320DM368的ISIF接口如何连接

目前准备用TMS320DM368的ISIF标准接口连接COMS影像传感器，DM368中有一个引脚名为“C_WE_FIELD /GIO93 / CLKOUT0/ USBDRVVBUS”其datasheet中的描述为：
Write enable input signal is used by external device
(AFE/TG) to gate the DDR output of the ISIF modu
Alternately, the field identification input signal is use
by external device (AFE/TG) to indicate the which o
two frames is input to the ISIF module for sensors
with interlaced output. ISIF handles 1- or 2-field
sensors in hardware.
GIO: GIO[93]
CLKOUT0: Clock Output
USB: Digital output to control external 5 V supply
问题：当用作ISIF接口时，这个引脚作用是什么？如何和COMS连接？是连接到COMS的OE（out enable）引脚吗？可以悬空吗？请高手指点一下，谢谢！