Is it possible to insert a byte into the VBI (line 10) of BT.656 input to an ADV7391 (SD Timing Mode 0) with a NTSC-M output and then read this byte from VBI (line 10) in BT.656 VBI data from a ADV7180? I am trying to do this, but not having much success.
Do I have to use CGMS, WSS, or VITS to do this or may I just put the data byte in the BT.656 (of line 10)?
In the ADV7391 (32-pin device) I have subaddress 0x83 = 1
In the ADV7180 I have VBI_EN 0x03 = 1
In the ADV7180 I have BL_C_CBI 0x4 = 0
I do not understand what the statement below means!
ADV7391 datasheet (RevG) p 52 under the heading: VERTICAL BLANKING INTERVAL Subaddress 0x31, Bit 4; Subaddress 0x83, Bit 4
"In SD Timing Mode 0 (slave option), if VBI is enabled, the blanking bit in the EAV/SAV code is overwritten. It is possible to use VBI in this timing mode as well."
Could you explain this?
-- Dave K