USB Type-A Port
Radxa Cubie A7A features 4 onboard USB Type-A ports: 1 USB 3.1 port and 3 USB 2.0 ports.
For the exact location of the USB Type-A ports, please refer to the interface description section in the Hardware Interfaces guide!
- USB 3.1 Type-A
Theoretical maximum transfer rate is 5Gbps, and the internal color of the port is usually blue.
- USB 2.0 Type-A
Theoretical maximum transfer rate is 480Mbps, and the internal color of the port is usually black.
Usage Guide
Test USB 3.1/2.0 Type-A HOST mode.
You can connect USB devices such as a mouse or keyboard to each USB Type-A port, repeatedly plug and unplug to test whether Cubie A7A recognizes and works with them properly.
USB HOST Test
No USB Device Connected
Use the lsusb command to view the list of USB devices.
lsusb
Sample terminal output:
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID a69c:8d80 aicsemi AIC Wlan
Bus 003 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
USB Device Connected
Use the lsusb command to view the list of USB devices and check if the connected USB device is recognized.
lsusb
Sample terminal output: I connected a card reader to the USB port
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID a69c:8d80 aicsemi AIC Wlan
Bus 003 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 003: ID 067b:2731 Prolific Technology, Inc. USB SD Card Reader
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
By comparing the two, you can see that after connecting the USB device, the ID of Bus 002 Device 003 changes, indicating the USB device is recognized correctly.
USB Read/Write Test
Connect a USB flash drive to the USB 2.0 or USB 3.0 Type-A port, and use the dd command to test USB read/write performance.
Confirm Storage Device
Use the lsblk command to confirm the device name of the USB flash drive.
lsblk
Sample terminal output: Here, sda is the device name of my current USB flash drive. Please replace it according to your actual situation.
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 1 58G 0 disk
mtdblock0 31:0 0 16M 0 disk
mmcblk1 179:0 0 58G 0 disk
├─mmcblk1p1 179:1 0 16M 0 part /config
├─mmcblk1p2 179:2 0 300M 0 part /boot/efi
└─mmcblk1p3 179:3 0 57.6G 0 part /
zram0 253:0 0 1.9G 0 disk [SWAP]
Test Write Performance
sudo dd if=/dev/zero of=/dev/sda bs=1M count=100
dd: A command-line tool in Linux for copying and converting files.if=/dev/zero: Specifies the input file as/dev/zero, a special file that provides unlimited zero bytes.of=/dev/sda: Specifies the output file as/dev/sda, i.e., the USB flash drive device.bs=1M: Sets the block size to 1MB.count=100: Copies 100 blocks.
This command writes 100MB of zero bytes to the USB flash drive and displays the write speed.
Sample terminal output:
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 3.40424 s, 30.8 MB/s
Test Read Performance
sudo dd if=/dev/sda of=/dev/null bs=1M count=100
dd: A command-line tool in Linux for copying and converting files.if=/dev/sda: Specifies the input file as/dev/sda, i.e., the USB flash drive device.of=/dev/null: Specifies the output file as/dev/null, a special file that discards all data written to it.bs=1M: Sets the block size to 1MB.count=100: Copies 100 blocks.
This command reads 100MB of data from the USB flash drive to /dev/null and displays the read speed.
Sample terminal output:
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 4.0582 s, 25.8 MB/s
Port Specifications
For complete technical specifications and pin definitions, please refer to the Hardware Design: Schematic document in the download section.