CYUSB3314 datasheet(6/43 Pages) CYPRESS

6 / 43 page

CYUSB330x/CYUSB331x

CYUSB332x/CYUSB230x

Document Number: 001-73643 Rev. *R

Page 6 of 43

Product Features

Shared Link

Figure 1. Application of Shared Link in a Notebook

Shared Link is a Cypress-proprietary feature that enables a

USB 3.0 port to be split into an embedded SS port and a

standard USB 2.0 port. Shared Link enables a maximum of eight

DS ports from a four-port USB 3.0 hub.

For example, if one of the DS ports is connected to an embedded

SS device, such as a USB 3.0 camera, HX3 enables the system

designer to reuse the USB 2.0 signals of that specific port to

connect to a standard USB 2.0 port. Figure 1 shows how Shared

Link can be used in an application.

Figure 2. DS Port VBUS Control in Shared Link

The Shared Link mode requires a separate VBUS control for the

removable USB 2.0 device and the embedded SS device.

Figure 2 shows the VBUS control implementation.

To ensure that the embedded SS device does not fall back to

USB 2.0 operation, an external power switch is required. This

switch is controlled by HX3, which generates an output signal

called DSx_VBUSEN_SL. This signal controls the VBUS for the

embedded device.

DSx_PWREN is another output signal generated by HX3 and

controls VBUS for the removable USB 2.0 device. For example,

when an overcurrent condition occurs, DSx_PWREN turns off

the port power.

Ghost Charge

Ghost Charge is a Cypress-proprietary feature for charging USB

devices on the DS port when the US port is not connected to a

host. For example, in a docking station with HX3 as shown in

Figure 3, when the laptop is undocked, HX3 will emulate a

dedicated charging port (DCP) to provide charge to a phone

connected on a DS port.

Figure 3. Ghost Charge

USB 3.0

Example: Shared Link Provides Six USB Ports in a Notebook

Standard

USB 2.0 Port

Internal

SS Port

USB 3.0 Port Split Into SS Port and Standard USB 2.0 Port

USB 3.0

USB 2.0

WiFi Module

DS4

Chipset

USB 2.0

(internal)

USB 2.0

(internal)

DS3

USB 3.0

Camera

Notebook PC

Motherboard

HX3

USB 3.0

Card Reader

USB 3.0 Port

USB 3.0

SuperSpeed

PHY

USB 2.0

PHY

USB 3.0 DS Port

Embedded

SuperSpeed

Device

Removable

USB 2.0

Device

HX3

VBUS

Charge a smartphone without docking the notebook

HX3

Power to Smartphone

(HX3’s Downstream Port)

USB Cable

Notebook PC

Undocked

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