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USB Type-A Ports

The Radxa ROCK 4D features 4 onboard USB Type-A ports, including 2 USB 3.0 ports and 2 USB 2.0 ports.

  • USB 3.0 Type-A

    • Theoretical maximum transfer rate: 5Gbps
    • Ports are typically colored blue internally
    • The top USB 3.0 Type-A port supports both OTG and HOST modes
    • The bottom USB 3.0 Type-A port supports HOST mode only

  • USB 2.0 Type-A

    • Theoretical maximum transfer rate: 480Mbps
    • Ports are typically colored black internally
ROCK 4D USB Type-A Ports

User Guide​

Test both USB 3.0/2.0 Type-A HOST and OTG modes.

Connect USB devices such as mice and keyboards to each USB Type-A port, then repeatedly connect and disconnect them to verify that the ROCK 4D properly recognizes and works with the devices.

USB HOST Mode Testing​

Without USB Peripherals Connected​

Use the lsusb command to list all USB devices.

radxa@radxa-4d$
lsusb

Example 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

With USB Peripherals Connected​

Use the lsusb command to check the USB device list and verify if the connected USB peripherals are recognized.

radxa@radxa-4d$
lsusb

Example output (with a USB card reader connected):

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 outputs, you can observe that after connecting a USB peripheral, the ID Bus 002 Device 003 appears, indicating that the USB peripheral has been properly recognized.

USB Read/Write Testing​

Connect a USB flash drive to either a USB 2.0 or USB 3.0 Type-A port and use the dd command to test USB read/write performance.

Identify Storage Device​

Use the lsblk command to identify your USB device name.

radxa@radxa-4d$
lsblk

Example output (in this case, sda is the USB flash drive - replace with your actual device name):

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​

radxa@radxa-4d$
sudo dd if=/dev/zero of=/dev/sda bs=1M count=100
  • dd: A command-line utility for copying and converting files in Linux
  • if=/dev/zero: Specifies the input file as /dev/zero, a special file that provides an endless stream of null bytes
  • of=/dev/sda: Specifies the output file as your USB device (replace sda with your actual device)
  • bs=1M: Sets the block size to 1MB
  • count=100: Specifies to copy 100 blocks

This command writes 100MB of zero bytes to the USB drive and displays the write speed.

Example 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​

radxa@radxa-4d$
sudo dd if=/dev/sda of=/dev/null bs=1M count=100
  • dd: A command-line utility for copying and converting files in Linux
  • if=/dev/sda: Specifies the input file as your USB device (replace sda with your actual 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: Specifies to copy 100 blocks

This command reads 100MB of data from the USB drive to /dev/null and displays the read speed.

Example output:

100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 4.0582 s, 25.8 MB/s

Interface Specifications​

tip

For detailed interface specifications, please refer to the Hardware Design: Schematics in the download section.

USB 2.0 Type-A​

Pin#NamePin#NamePin#Name
15V_USB_HOST55V_USB_HOST9GND
2USB20_2DM6USB20_3DM10GND
3USB20_2DP7USB20_3DP11GND
4GND8GND12GND

USB 3.0 Type-A​

Pin#NamePin#NamePin#Name
15V_USB_OTG09USB3_OTGOSSTXP17USB3_OTG1_TXN
2USB3_OTG0DM105V_USB_HOST18USB3_OTG1_TXP
3USB3_OTG0DP11USB3_HOST1DM19GND
4GND12USB3_HOST1DP20GND
5USB3_OTG0SSRXN13GND21GND
6USB3_OTG0SSRXP14USB3_OTG1_RXN22GND
7GND15USB3_OTG1_RXP
8USB3_OTGOSSTXN16GND