VPS_VIP_POLARITY_HIGH 是什么意思？

VPS_VIP_POLARITY_HIGH,是上升沿有的意思吗？还是高电平时有效?

struct Vps_VipDiscreteConfig {
 
        /* Post count value when using vsync skew in FID determination */
        u32 fidSkewPostCnt;
 
        /* Pre count value when using vsync skew in FID determination */
        u32 fidSkewPreCnt;
 
        /* For valid values see #Vps_VipLineCaptureStyle */
        u32 lineCaptureStyle;
 
        /* How to detect fid, For valid values see #Vps_VipFidDetectMode */
        u32 fidDetectMode;
 
  

/* Polarity of the Active Video signal, For valid values see #Vps_VipPolarity */
        u32 actvidPol;
 
        /* Polarity of Vsync signal, For valid values see #Vps_VipPolarity */
        u32 vsyncPol;
 
        /* Polarity of hsync signal, For valid values see #Vps_VipPolarity */
        u32 hsyncPol;

 
};

enum Vps_VipPolarity {
 
         /* low Polarity */
        VPS_VIP_POLARITY_LOW = 0,
 
        /* high Polarity */
        VPS_VIP_POLARITY_HIGH,
 
        /* Value is dont care */
        VPS_VIP_POLARITY_DONT_CARE = -1
 
 
};