USB3813 datasheet(26/57 Pages) MICROCHIP

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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,

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