USB3813 datasheet(24/57 Pages) MICROCHIP

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USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications

Datasheet

DS00001715A-page 24

 2014 Microchip Technology Inc.

Chapter 6 Device Configuration

The device supports a large number of features (some mutually exclusive), and must be configured in

order to correctly function when attached to a USB host controller. The hub can be configured either

internally or externally depending on the implemented interface.

Microchip provides a comprehensive software programming tool, Pro-Touch, for configuring the

USB3813 functions, registers and OTP memory. All configuration is to be performed via the Pro-Touch

programming tool. For additional information on the Pro-Touch programming tool, contact your local

Microchip sales representative.

6.1

Configuration Method Selection

The hub will interface to external memory depending on the configuration of the device pins associated

with each interface type. The device will first check whether an external SPI ROM is present. If present,

the device will operate entirely from the external ROM. When an external SPI ROM is not present, the

device will check whether the SMBus is configured. When the SMBus is enabled, it can be used to

configure the internal device registers via the XDATA address space, or to program the internal OTP

memory. If no external options are detected, the device will operate using the internal default and

configuration strap settings. The order in which device configuration is attempted is summarized below:

1. SPI (Reading the configuration from an SPI ROM)

2. SMBus (either writing the configuration registers in the XDATA address space, or to OTP)

3. Internal default settings (with or without configuration strap over-rides)

Note: Refer to Chapter 7, "Device Interfaces," on page 28 for detailed information on each device

configuration interface.

6.2

Customer Accessible Functions

The following USB or SMBus accessible functions are available to the customer via the Pro-Touch

Programming Tool.

Note: For additional programming details, refer to the Pro-Touch Programming Tool User Manual.

6.2.1

USB Accessible Functions

6.2.1.1

VSM commands over USB

By default, Vendor Specific Messaging (VSM) commands to the hub are enabled. The supported

commands are:



Enable Embedded Controller



Disable Embedded Controller



Enable Special Resume



Disable Special Resume



Reset Hub

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