Are there any SD decoders can disable AV code at output?
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The ADV7842 amd ADV7403 allow you to turn off the AV codes
I can see the registers SDP_SAV_EN and SDP_EAV_EN for ADV7842, but no AV code disable bit for SDP in ADV7403.
For ADV7403 see AV_CODE_EN for the CP processor. ADV7403 does not have a bit to turn off AV_CODE insertion for the STD processor. So it will not fulfill your needs.
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