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title: XMOS No-Development Firmware Download and Instructions
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---

# XMOS A316 No-Development Firmware Download and Instructions

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## <a href="javascript:void(0);" onclick="checkLogin('/assets/download/a316-8711-5.1make/A316免开发固件firmware_gen_0.0.5.zip')">Click to Download Firmware</a>

## Function Mode Switching
Use command byte 0x23 to send the following commands for corresponding mode switching

[UART Communication Protocol Reference](../../dev_doc/a316/xu316-protocol-english.md)

| Interface Type         | 0x23 Command (Byte1-5 Combination) |
| :-------------------- | :---- |
| USB in-I2S out        | 0x0080a90001 |
| UAC1.0                | 0x0080010002 |
| Coaxial IN-I2S OUT    | 0x0080651003 |
| Optical IN-I2S OUT    | 0x1080651004 |
| USB IN-SPDIF OUT      | 0x2080651005 |
| I2S(slave) in-I2S OUT | 0x0080c50806 |
| HDMI ARc IN-I2S OUT   | 0x0082d58107 |

## MCU Connection Instructions for Demo Version

HOST UART TX  <==>   XU316 X0D37

HOST UART RX  <==>   XU316 X0D31

![pin](../../assets/images/hifi_audio/A316-pin.png){width="700"}

## Please Refer to Portmap for Other Connection Functions

[Click to View Full Portmap](../../assets/images/hifi_audio/portmap_gen_firmware_USB.png)

1. factory_no_mqa_0.0.5.bin is the factory firmware, use the following command to flash (requires xtag flashing tool):

``` sete
xflash --write-all factory_no_mqa_0.0.5.bin --target-file xu316_qf60.xn
```

2. update_no_mqa_0.0.5.bin is the DFU firmware, requires the driver's DFU upgrade tool to update