USB7006SLASHKDX datasheet(34/56 Pages) MICROCHIP

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USB7006

DS00003715B-page 34

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8.3

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.

8.4

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.

For detailed information on utilizing the FlexConnect feature, refer to the application note “USB70xx FlexConnect Oper-

ation

”, which can be found on the Microchip USB7006 product page at www.microchip.com/USB7006.

FIGURE 8-3:

PORT POWER CONTROL USING A POLY FUSE

PRT_CTLx

50k

PRTPWR

OCS

USB

Device

Pull-Up Enable

Poly Fuse

FILTER

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