USB7252P datasheet(42/64 Pages) MICROCHIP

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USB7252P

DS00003561A-page 42

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2018 - 2020 Microchip Technology Inc.

8.5

PortSplit

The PortSplit feature allows the USB 2.0 and USB 3.2 PHYs associated with a downstream port to be operationally sep-

arated. The intention of this feature is to allow a system designer to connect an embedded USB 3.x device to the USB

3.2 PHY, while allowing the USB 2.0 PHY to be used as either a standard USB 2.0 port or with a separate embedded

USB 2.0 device. PortSplit can be configured via OTP/SMBus. By default, all ports are configured to non-split mode.

When PortSplit is disabled on a specific port, the corresponding

PRT_CTLx pin controls both the USB 2.0 and USB 3.2

portions of the port (port power and overcurrent condition). When PortSplit is enabled on a specific port, the corre-

sponding

PRT_CTLx pin controls the USB 2.0 portion of the port, and the corresponding PRT_CTLx_U3 pin controls

the USB 3.2 portion of the port.

8.6

FlexConnect

The device allows the upstream port to be swapped with any downstream port, enabling any USB port to assume the

role of USB host at any time during hub operation. This host role exchange feature is called FlexConnect. Additionally,

the USB 2.0 ports can be flexed independently of the USB 3.2 ports.

This functionality can be used in two primary ways:

Host Swapping: This functionality can be achieved through a hub wherein a host and device can agree to swap

the host/device relationship; The host becomes a device, and the device becomes a host.

Host Sharing: A USB ecosystem can be shared between multiple hosts. Note that only 1 host may access to

the USB tree at a time.

FlexConnect can be enabled through any of the following three methods:

•

I2C Control: The embedded I2C slave can be used to control the state of the FlexConnect feature through basic

write/read operations.

•

USB Command: FlexConnect can be initiated via a special USB command directed to the hub’s internal Hub

Feature Controller device.

•

Direct Pin Control: Any available GPIO pin on the hub can be assigned the role of a FlexConnect control pin.

For detailed information on utilizing the FlexConnect feature, refer to the application note “USB720x/USB725x FlexCon-

nect Operation”, which can be found on the Microchip USB7252P product page at www.microchip.com/USB7252P.

8.7

Multi-Host Endpoint Reflector

The internal Multi-Host Endpoint Reflector allows for smart-phone automotive mode sessions to be entered on the

downstream ports. The device supports the Multi-Host Endpoint Reflector on downstream ports.

The Multi-Host Endpoint Reflector uses standard Network Control Model (NCM v1.0) device protocol, which is a sub-

class of Communication Device Class (CDC) group of protocols. Standard NCM USB drivers may be utilized; No custom

drivers are required.

A Multi-Host Endpoint Reflector session may be entered on only 1 downstream port at a time. Entry into Multi-Host mode

is initiated via a no data Control USB transfer addressed to the internal Hub Feature Controller device in the hub.

The USB7252P has two internal USB devices. The Multi-Host Endpoint Reflector is a Composite iAP and NCM device.

The Hub Feature Controller is a Generic USB Device Class device which enables the USB bridging functions.

The hub ports which are connected to both the Multi-Host Endpoint Reflector and Hub Feature Controller are both con-

figured as non-removable.

For detailed information on utilizing the multi-host endpoint reflector feature, refer to the application note “USB7202/

USB725x Multi-Host Endpoint Reflector Operation”, which can be found on the Microchip USB7252P product page at

www.microchip.com/USB7252P.

Note:

Direct Pin Control is only available in CFG_STRAP Mode 4 - GPIO/FlexConnect. Refer to Section 3.3.4,

PF[31:2] Configuration (CFG_STRAP[2:1]) for additional information.

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