ZHCSEN6D October 2014 – February 2022 DS90UH948-Q1
PRODUCTION DATA
The DS90UH948Q-Q1 supports AV MUTE functionality when receiving the specifically defined data pattern (0x666666) during the blanking period (DE = LOW). Once the device enters the AV MUTE state, the device mutes both audio and video outputs resulting in a black display screen.
Be advised if the video source continues sending random data during blanking interval, the deserializer may inadvertently enter the AV MUTE state upon receiving random data matching the AV MUTE command pattern. When paired with a UB version FPD-Link compatible serializer, setting the gate DE Register 0x04[4] will prevent video signals from being sent during the blanking interval. This will ensure AV MUTE mode is not entered during normal operation. By default the Data Enable (DE) signal is assumed to be active high. If DE is active low, then setting DE_POLARITY register bit 0x12 bit[5] = 1 is also required. With the DE permanently LOW, deserializers do not check for the AV Mute conditions, so the AV Mute is not an issue when operating with HSYNC/VSYNC only mode displays.
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 DS90UH948Q-Q1.
When the DS90UH948Q-Q1 is paired with a compatible “UH” Serializer, inadvertently entering the AVMUTE state is not possible as the “UH” Serializers do not send video data during the blanking interval. Setting the register 0x12 bit 6, PASS_RGB is not recommended as it will make the “UH” Serializers function as “UB” Serializers and induce the possibility of inadvertently entering the AVMUTE state.