Microchip USB4624 Manual


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2013 Microchip Technology Inc. DS00001589A-page 1
INTRODUCTION
The Microchip USB253x/USB46x4/USB3x13 product lines are a family of feature-rich, low-power USB 2.0 hubs
optimized for use in portable devices or embedded systems where high performance and minimal BOM costs are critical
design requirements. The SMBus slave interface is a 2-pin protocol which can be used to customize the functionality of
this family of USB hubs. The System on Chip (SoC) can use this interface to control the digital and USB lines for testing,
configure custom functionality, and load custom firmware to unlock the various features of the embedded processor.
Among these features is a USB compliance test mode designed to facilitate USB compliance testing when a USB253x/
USB46x4/USB3x13 hub is applied within an embedded system.
This document includes the following topics:
Embedded Host Compliance Testing Modes Overview
Test Mode Setup
Test Mode Descriptions
Audience
This document is written for developers who are familiar with USB and SMBus protocols as well as USB 2.0 compliance
tests. The goal of this application note is to describe the USB253x/USB46x4/USB3x13 embedded test modes to help
facilitate compliance testing within embedded designs.
EMBEDDED HOST COMPLIANCE TESTING MODES OVERVIEW
The “Embedded Host Compliance Testing Modes” feature is designed to allow the hub to be tested for USB compliance
when the tester is unable to easily control testing modes through the upstream USB port. These test modes are enabled
and controlled via a series of SMBus writes to the hub that are performed during configuration. After the test modes
have been enabled during configuration, the hub can generate one of the following test patterns through any of its down-
stream ports:
TEST_SE0: The hub’s downstream port drives SE0
TEST_J: The hub’s downstream port enters high-speed J state
TEST_K: The hub’s downstream port enters high-speed K state
TEST_PACKET: The hub’s downstream port sends compliance test packets
TEST MODE SETUP
The following configuration steps must be performed to activate the “Embedded Host Compliance Testing Modes”.
Refer to Application Note 26.18 entitled “SMBus Slave Interface for the USB253x/USB3x13/USB46x4” for in-depth
information regarding the SMBus protocol as well as additional features that can be controlled via SMBus.
1. Pull-up the SMBus SCL and SDA lines to 3.3V and reset the hub to hold the device in the SoC configuration
stage.
2. Using SMBus slave address 2D, write to the following test configuration register to select the desired test mode.
AN1589
USB253x/USB46x4/USB3x13 Embedded Testing
Modes
Author: Andrew Rogers,
Microchip Technology Inc.


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: USB4624

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