USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications
Datasheet
DS00001715A-page 26 2014 Microchip Technology Inc.
6.2.1.6 Other Embedded Controller functions over USB
The following miscellaneous functions may be configured via USB:
Enable/Disable Embedded controller enumeration
Program Configuration parameters.
Program descriptor fields:
—Language ID
—Manufacturer string
—Product string
—idVendor
—idProduct
—bcdDevice
6.2.2 SMBus Accessible Functions
6.2.2.1 OTP Access over SMBus
The device’s OTP ROM is accessible over SMBus. All OTP parameters can modified via the SMbus
Host. The OTP can be programmed to operate in Single-Ended, Differential, Redundant, or Differential
Redundant mode, depending on the level of reliability required. The supported commands are:
Enable OTP reset
Set OTP operating mode
Set OTP read mode
Program OTP
Get OTP Status
Program OTP control parameters
6.2.2.2 Configuration Access over SMBus
The following functions are available over SMBus prior to the hub attaching to the USB host:
Program Configuration parameters.
Program descriptor fields:
—Language ID
—Manufacturer string
—Product string
—idVendor
—idProduct
—bcdDevice
Program Control Register
6.3 Device Configuration Straps
Configuration straps are multi-function pins that are driven as outputs during normal operation. During
a Power-On Reset (POR) or an External Chip Reset (RESET_N), these outputs are tri-stated. The high
or low state of the signal is latched following de-assertion of the reset and is used to determine the
default configuration of a particular feature. Configuration straps are latched as a result of a Power-On
Reset (POR) or a External Chip Reset (RESET_N). Configuration strap signals are noted in Chapter 3,
