翻译：S3C6410中一句极为重要的内容

The first register setting for frame capture command can occur in any part of frame period. It is recommend to do　first setting at the VSYNC “L” state. VSYNC information can be read from status SFR. Refer to the below Figure　20-10. All command includes ImgCptEn and is valid at VSYNC falling edge. Make sure that except first SFR　setting, all command must be programmed in ISR (Interrupt Service Routine). It is not allowed for target size　information to be changed during capture operation. However, image mirror or rotation, windowing, and Zoom In　settings can change in capturing operation.
我的翻译：　
　　第一个寄存器设置为帧捕捉命令，可以在帧期间的任何部分发生。建议将第一个设置处于VSYNC "L"状态。VSYNC信息可以从状态SFR读取。具体内容可以参见图20-9.所有的命令包含ImgCptEn，并且在VSYNC下降沿有效。确定除了第一个SFR设置外，所有的命令在ISR下都可以被程式化。图像镜像或者旋转，加窗和缩放设置可以在捕捉操作时改变。

问题：１）　The first register setting for frame capture command　是指什么寄存器？　命令又是什么命令？
　　　２）　It is recommend to do　first setting at the VSYNC “L” state。哪个寄存器可以设置 VSYNC 为“L” state？

学习了，支持楼主，顶起来。