ORCA SBC/Interfaces and Connectors/Audio

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Issue Date Notes
2021/12/10 First release

Audio interface[edit | edit source]

There is no directly available Audio interface on the Evaluation Kit, two SAI and one SPDIF full duplex interfaces are available on the expansion connector.

Description[edit | edit source]

The SAI and SPDIF interfaces are available on the Evaluation Kit at the connector J8.

J8 is a 20x2x2.54mm pin header expansion connector that delivers many interfaces unused on board.

Audio connector (on J8)

Signals[edit | edit source]

The following table describes the interfaces signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1, 17 - 3V3_CB Power output for transceiver supply BOARD_PGOOD driven rail
2, 4 - 5V_VIN Power output for transceiver supply Always ON rail
6, 9, 14, 20,

25, 30, 34, 39

- DGND Ground
7 J15. SAI2_TXFS Transmit Frame Sync
8 J15. SAI2_RXFS Receive Frame Sync
10 J15. SAI2_RXC Receive Bit Clock
11 J15. SAI2_RXD0 Receive Data 0
12 J15. SAI2_TXC Transmit Bit Clock
16 J15. SAI2_TXD0 Transmit Data 0
18 J15. SAI2_MCLK Audio Master Clock
13 J15. SPDIF_RX SPDIF Receiver
15 J15. SPDIF_TX SPDIF Transmitter
22 J15. SAI5_MCLK Audio Master Clock
32 J15. SAI5_RXFS Receive Frame Sync
35 J15. SAI5_RXD3 Receive Data 3
36 J15. SAI5_RXD2 Receive Data 2
37 J15. SAI5_RXD1 Receive Data 1
38 J15. SAI5_RXD0 Receive Data 0
40 J15. SAI5_RXC Receive Bit Clock

Please note that all the signals are 0-3.3V level.

Device mapping[edit | edit source]

The device mapping depends on the used device and the device tree configuration.

Device usage[edit | edit source]

The associated device can be accessed in Linux by standard stacks, such as pulse audio or alsalib.