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Contents
Audio interfaceEdit
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.
DescriptionEdit
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.
SignalsEdit
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 mappingEdit
The device mapping depends on the used device and the device tree configuration.
Device usageEdit
The associated device can be accessed in Linux by standard stacks, such as pulse audio or alsalib.