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

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#	Name	Pin#	Name	Pin#	Name
1	5V_USB_HOST	5	5V_USB_HOST	9	GND
2	USB20_2DM	6	USB20_3DM	10	GND
3	USB20_2DP	7	USB20_3DP	11	GND
4	GND	8	GND	12	GND

USB 3.0 Type-A

Pin#	Name	Pin#	Name	Pin#	Name
1	5V_USB_OTG0	9	USB3_OTGOSSTXP	17	USB3_OTG1_TXN
2	USB3_OTG0DM	10	5V_USB_HOST	18	USB3_OTG1_TXP
3	USB3_OTG0DP	11	USB3_HOST1DM	19	GND
4	GND	12	USB3_HOST1DP	20	GND
5	USB3_OTG0SSRXN	13	GND	21	GND
6	USB3_OTG0SSRXP	14	USB3_OTG1_RXN	22	GND
7	GND	15	USB3_OTG1_RXP
8	USB3_OTGOSSTXN	16	GND