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TDA4VM: 关于IO retention的控制

Part Number: TDA4VM

您好,我在TDA4VM的用户手册上看到了如下说法:

The control of DDRSS retention is controlled via external DDR_RET pin.

我的理解是IO rentention功能的开启需要硬件向DDR_RET这个引脚去进行相关操作

那么,如果我想要使能IO retention的话,是需要将这个引脚的电平拉高还是拉低?