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tvp5150PBS 2.10 Active Video Cropping

Miguel Mendo
Prodigy 10 points
Other Parts Discussed in Thread: TVP5150

Hi

I'm having problems with the Vertical blanking start  and stop
(18h and 19h) on the TVP5150PBS (ROM Ver 0x02, 0x10).

We have a Pal Video with 288 lines in two half frames.

In standard configuration the tvp5150 delivers us 17 additional lines at the beginning of the frame.

we were trying to move the activ video section with the vertical blanking registers (0x18 and 0x19) with no effect.

as we understand there is a bug in the tvp5150 that prevents the Vertical blanking stop register to work properly.

is there another way to adjust the vertical blacking using the Indirect Registers.

we tried to write the registers  AVID_FIELD1_START,  AVID_FIELD2_START, AVID_FIELD1_STOP, AVID_FIELD2_STOP,

but without further documentation we had no luck.

could you provide us an example or  enhanced documentation that enables us to adjust the vertical blanking.

many thanks in advance

miguel mendo






  • 0
    Prodigy 135 points

    First you need to unlock TVP5150 by writing 0x5150 to indirect register 0x2FF. Then set the following registers as you want: (0x329) = 0xxxxx(VSYNC start),(0x32A) = 0xxxxx(VSYNC stop),(0x323) = 0xxxxx(HSYNC start) (0x324) = 0xxxxx(HSYNC stop)