To SoM
USB1_ID Pulled low. J721E in Host Mode.
#1
#2
#3
#4
#1
#2
#3
#4
NOTE:
Automatic Charge Mode Disabled
PWRCTL Polarity is Active High
Power Switching and Overcurrent Inputs Supported
Individual Power Control Enabled
J721E EVM Hardware Architecture
61
SPRUIS4A – December 2019 – Revised May 2020
Copyright © 2019–2020, Texas Instruments Incorporated
Jacinto7 J721E/DRA829/TDA4VM Evaluation Module (EVM)
4.12.2
USB 2.0 Interface
The USB1 port of J721E SoC is used for USB 2.0 interface in J721E EVM. The USB1 signals are
connected to upstream port of USB 2.0 Hub (TUSB4041IPAPR). The four downstream ports from USB
Hub are connected are shown below:
•
2 USB ports are terminated to Type A Stacked Connector (AU-Y1008-2)
•
1 USB port is connected to 4 Pin Header (PCIe Card - WiFi/BT)
•
1 USB port is connected to EVM Expansion connector
The reference clock to the USB HUB is provided using 24 MHz crystal and also an optional clock input
from the Peripheral clock generator using a resistor mux. The default clock source is set to crystal.
Figure 43. USB Hub Reference Clock Circuit
shows the USB HUB strapping options.
Figure 44. USB Hub Settings Circuit
And the USB ID pin is pulled low to operate the SoC in Host mode.
Figure 45. USB1 ID Setting for HUB