是这样的，正在做使用DM648进行OV5642 200万像素的RAW方式抓取，现在帧同步有点问题。
文档上是这么说的
To ensure initial capture synchronization to the beginning of a frame, an optional setup synchronization
enable (SSE) bit is provided in VCxSTRT1. If the SSE bit is set, then when the VCEN bit is set to 1, the
video port will not start capturing data until after detecting two vertical blanking intervals. If the SSE bit is
cleared to 0, capture begins immediately when the VCEN bit is set.
In raw capture mode, the VCVBLNKP bits defines the minimum vertical blanking period. If CAPEN stays
de-asserted longer than VCVBLNKP clocks, then a vertical blanking interval is considered to have
occurred. If the SSE bit is set when the capture first begins (the VCEN bit is set in VCxCTL), the capture
does not start until two intervals are counted. This allows the video port to synchronize its capture to the
top of a frame when first started.
就是说VCVBLNKP定义了一个最小的帧消隐时间，大于这个的CAPEN低电平周期就被认为是vertical blanking。
那么我在抓取OV5642的图像时 line blanking、vertical blanking的低电平时钟都比较长，大于了VCVBLNKP定义的FFF个时钟，那么是不是DM648无法同步了？
