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TVP5150输出黑边

Other Parts Discussed in Thread: TVP5150AM1

我们用的是TVP5150AM1,输出的图像下边有大概4行的黑边。手册上写可以通过修改VBLK registers 18h 19h解决这个问题,但是我们一直用的都是Embedded syncs的数据格式,手册上写18h 19h在这种情况下是没有效果的,请问是否还有其他办法可以解决?最好只是修改软件,不改硬件

非常感谢