Microchip Technology EVB-USB4x12, Руководство пользователя

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EVB-USB4x12 Evaluation Board User’s Guide
DS50002889A-page 16  2019 Microchip Technology Inc.
2.3.3 Host Connection
A USB2.0 or host must be connected to the upstream USB Mini-B port J1. A Type-A to
Mini-B cable or a Type-C to Mini-B cable is required to connect the board to a standard
USB host.
2.3.4 Downstream Port Connections
Once host connection is established on the upstream host port and the host issues the
command to the hub to enable downstream port power, devices may be connected to
the downstream port(s) to begin communicating with the USB host.
Downstream port 1 is a standard USB Type-A receptacle. This port includes a 5V
UCS2114 power switch capable of delivering up to 3A of current before over-current
protection is triggered. Diode D4 labeled “VBUS P1” will illuminate when VBUS power
is applied to the port.
Downstream port 2 is available on USB4912 only, and includes a standard USB Type-A
receptacle. This port is intended to connect another hub tier. It is not intended to oper -
ate as a standard USB port as it does not have individual power enable and overcurrent
detection functionality. This port is also powered from the 5V UCS2114 power switch
device and is ‘always on’.