USB5537B datasheet(4/79 Pages) MICROCHIP

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USB5537B

DS00001682C-page 4

 2012 - 2015 Microchip Technology Inc.

1.0

INTRODUCTION

1.1

Conventions

Within this manual, the following abbreviations and symbols are used to improve readability.

1.2

Overview

The USB5537B hub is a 7-port, low-power, configurable Hub Controller fully compliant with the USB 3.0 Specification

2. The USB5537B supports 5 Gbps SuperSpeed (SS), 480 Mbps Hi-Speed (HS), 12 Mbps Full-Speed (FS) and

1.5 Mbps Low-Speed (LS) USB signaling for complete coverage of all defined USB operating speeds.

All required resistors on the USB ports are integrated into the hub. This includes all series termination resistors and all

required pull-down and pull-up resistors on D+ and D- pins. The over-current sense inputs for the downstream facing

ports have internal pull-up resistors.

The USB5537B hub includes programmable features such as:

• MultiTRAKTM Technology (USB 2.0): implements a dedicated Transaction Translator (TT) for each port. Dedi-

cated TTs help maintain consistent full-speed data throughput regardless of the number of active downstream

connections.

• PortSwap (USB 2.0): allows direct alignment of USB signals (D+/D-) to connectors to avoid uneven trace length

or crossing of the USB differential signals on the PCB.

• PHYBoost (USB 2.0): enables 4 programmable levels of USB signal drive strength in downstream port transceiv-

ers (HS, FS, LS USB only). PHYBoost will also attempt to restore USB signal integrity.

Example

Description

BIT

Name of a single bit within a field

FIELD.BIT

Name of a single bit (BIT) in FIELD

x…y

Range from x to y, inclusive

BITS[m:n]

Groups of bits from m to n, inclusive

Pin Name

zzzzb

Binary number (value zzzz)

0xzzz

Hexadecimal number (value zzz)

zzh

Hexadecimal number (value zz)

rsvd

Reserved memory location. Must write 0, read value indeterminate

code

Instruction code, or API function or parameter

Multi Word Name

Used for multiple words that are considered a single unit, such as:

Resource Allocate message, or Connection Label, or Decrement Stack Pointer instruction.

Section Name

Section or Document name.

xDon’t care

<> indicate a Parameter is optional or is only used under some conditions

{,Parameter}

Braces indicate Parameter(s) that repeat one or more times.

[Parameter]

Brackets indicate a nested Parameter. This Parameter is not real and actually decodes into

one or more real parameters.

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