How do I configure audio for FPD-Link III 94x devices?
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This is a guide for configuring audio for an FPD-Link III 94x serializer. Once the serializer is configured, the connected deserializer should not need any additional setup with respect to audio.
There are two different modes of audio transmission: FC (Forward Channel) GPIO and Data-Island modes.
In Data-Island mode, audio will be sent across the FPD-Link during the blanking periods of the video stream. This mode allows the usage of all 4 Dx pins (DA, DB, DC, DD) and preserves the FC GPIO slots for other purposes. This mode is recommended for most applications.
In FC GPIO mode, audio will be sent across the FPD-Link using the FC GPIO slots. The FC GPIO slots cannot be used for other purposes in this mode and at most DA and DB can be used for I2S audio (note that some deserializers may only support DA over FC GPIO transmission).FC GPIO audio should not be used when the D_GPIO are also used.
If using Data-Island audio:
If using FC GPIO audio:
8 channel I2S input on the BCLK, WCLK, DA, DB, DC, and DD pins of the DS90UH941AS-Q1 using Data-Island transmission.
GENERAL_CFG2 = board.ReadI2C(SER_ADDR, 0x04) GENERAL_CFG2 = (GENERAL_CFG2 & 0xEF) | 0x10 board.WriteI2C(SER_ADDR, 0x04, GENERAL_CFG2) # enable Data-Island audio DATAPATH_CTL = board.ReadI2C(SER_ADDR, 0x12) DATAPATH_CTL = (DATAPATH_CTL & 0xFD) | 0x00 board.WriteI2C(SER_ADDR, 0x12, DATAPATH_CTL) # select Data-Island transmission DATAPATH_CTL2 = board.ReadI2C(SER_ADDR, 0x1A) DATAPATH_CTL2 = (DATAPATH_CTL2 & 0xFE) | 0x01 board.WriteI2C(SER_ADDR, 0x12, DATAPATH_CTL2) # select 8 channel audio
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