Part Number: DS90UB928Q-Q1
Hello TI experts,
My customer designs their own PCB with DS90UB928.
In development stage they saw AV mute, and they checked datasheet below;
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9.3 AV Mute Prevention
The DS90UB928Q-Q1 may inadvertently enter the AV MUTE state if the serializer sends video data during
blanking period (DE = L) with a specific data pattern (24’h666666). Once the device enters the AV MUTE state,
the device mutes both audio and video outputs resulting in a black display screen. Setting the gate DE Register
0x04[4] on the serializer will prevent video signals from being sent during the blanking interval. This will ensure
AV MUTE mode is not entered during normal operation.
If unexpected AV MUTE state is seen, it is recommended to verify checking the data path control setting of the
paired Serializer. This setting is not accessible from DS90UB928Q-Q1.
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-> they fixed this problem with DE=Low to high, but they still have a question.
1. What is the exact usage of "DE Gate RGB" register?
2. Why is the default state of "DE Gate RGB" register Low even if there is any possibility of entering AV mute stare?
3. Is it okay to set "DE Gate RGB" register High to prevent AV mute?
Please check this issue. Thanks.
Best regards,
Chase
