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i.MX8 SMARC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
For the SPDIF transmitter, the audio data is provided by the processor via the SPDIFTxLeft and SPDIFTxRight registers.
The Channel Status bits are also provided via the corresponding registers. The SPDIF transmitter generates a SPDIF
output bitstream in the bi-phase mark format (IEC60958), which consists of audio data, channel status and user bits.
For more details on SPDIF Expansion Connector pinout, refer below table:
Exp.
Pin No
Signal Name
CPU Ball Name/
Pin Number
Signal Type/
Termination
Description
83
SPDIF_ETX_CLK
SPDIF_ETX_CLK/
BD6
O, 1.8V CMOS
Sony/Philips Digital Interface Clock.
Note: Optionally connected to
DMA_I2C2_SCL
85
SPDIF_TX
SPDIF_TX/BC9
O, 1.8V CMOS
Sony/Philips Digital Interface Transmit.
Note: Optionally connected to
DMA_I2C2_SDA
94
SPDIF_RX
SPDIF_RX/BC7
I, 1.8V CMOS
Sony/Philips Digital Interface Receive.
2.8.6
MLB Interface (Optional)
Media Local Bus Device functionality is implemented with an MediaLB 3-pin interface (single ended) or MediaLB 6-pin
interface (differential), however only one interface can be active at a time. The MediaLB interfaces are capable of
exchanging data at speeds up to 1024xFs in 3-pin mode or 6144xFs in 6-pin mode. Both MediaLB interfaces provide
real-time access to all network data types including streaming, packet, control, and isochronous data.
For more details of MLB on Expansion Connector, refer below table.
Exp.
Pin No
Signal Name
CPU Ball Name/
Pin Number
Signal Type/
Termination
Description
62
MLB_DATA_P
MLB_DATA_P/
F34
IO, MLB
Media Local Bus DATA positive.
64
MLB_DATA_N
MLB_DATA_N/
E35
IO, MLB
Media Local Bus DATA negative.
68
MLB_CLK_P
MLB_CLK_P/
D32
O, MLB
Media Local Bus Clock positive.
70
MLB_CLK_N
MLB_CLK_N/
E33
O, MLB
Media Local Bus Clock negative.
74
MLB_SIG_P
MLB_SIG_P/
D30
O, MLB
Media Local Bus Signal positive.
76
MLB_SIG_N
MLB_SIG_N/
E31
O, MLB
Media Local Bus Signal negative.
93
MLB_DATA
MLB_DATA/
E3
IO, 1.8V CMOS
Media Local Bus Data.
95
MLB_CLK
MLB_CLK/
D2
O, 1.8V CMOS
Media Local Bus Clock.
97
MLB_SIG
MLB_SIG/E1
O, 1.8V CMOS
Media Local Bus Signal.