USB 2.0 HSIC Hi-Speed 4-Port Hub Controller
Datasheet
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.
SMSC provides a comprehensive software programming tool, Pro-Touch, for configuring the USB4604
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
SMSC 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 33 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 SMSC Pro-
Touch Programming Tool.
Note: For additional programming details, refer to the SMSC 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
SMSC USB4604
29
Revision 1.0 (06-17-13)
DATASHEET
SMSC [ SMSC CORPORATION ]
