Datasheet AT43311 Datasheet (ATMEL)

Features

• Self-Powered Hub with Bus Power Controller

• Full Compliance with USB Spec Rev 1.0

• Full Speed USB Host Interface

• Four Downstream Ports

• Downstream Support for Full Speed and Low Speed Transfer Rates

• Continual Monitoring of Port by System Host

• Individual Port Power Control

• USB Connection Status Indicators

• 6 MHz Oscillator with On-Chip PLL

Description

The AT43311 is a fully compliant USB hub chip with 5 ports, one upstream port and
four full/low-speed downstream ports. The AT43311 can be used as a stand alone or
can provide a simple and quick method of adding USB ports to an existing device.

As a repeater, the AT43311 provides upstream connectivity between the selected
function and the host. Connectivity involves setting up and tearing do wn connecti ons,
handling bus faults, recovering from bus faults and detecting downstream device con­nections and disconnections.

The AT43311 may also act a s a hub cont roller mana ging the hu b operatio ns and
recording the status of the hub, bus transactions, and downstream ports. In this mode,
the AT43311 tracks and generates the bus enumeration , provides configuration infor­mation to the host, prov ides indi vidual port stat us to the host, an d controls the port
operation based on host commands.

AT43311

USB Hub

AT43311
Preliminary

Pin Configurations

SOIC/DIP/Cerdip

PWR2
PWR3
PWR4

VCC5

VSS
OSC1
OSC2

LFT

VCCA

OVL4
OVL3
OVL2
OVL1

VREF

GND

STAT4

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17

PWR1
DP4
DM4
DP3
DM3
GND
DP2
DM2
VCC3
DP1
XDM1
DP0
DM0
STAT1
STAT2
STAT3

0738A-A

1

Block Diagram

STAT3

DP0

PWR3

OVL3

DM3

DP3

OSC2

OSC1

TIMING

AND

CONTROL

PORT 4

STAT4

PWR4

LFT

OVL4

DM4

VCC5

VCC3

VCCA

VREF

GND

DP4

DM0

HUB CONTROLLER

Serial Interface

Engine

Endpoint 0

PORT 1

Endpoint 1

Note: 1. This document assumes that the reader is familiar with the Universal Serial Bus and therefore only describes the unique

features of the AT43311 chip. For detailed information about the USB and its operation, the reader should refer to the Uni­versal Serial Bus Specification Version 1.0, January 19, 1996.

STAT1

Overcurrent
Protection/
Reporting

OVL1

PWR1

DM1

DP1

PORT 2 PORT 3

STAT2

PWR2

PORT 0

REPEATER

DM2

OVL2

HUB

DP2

2

AT43311

AT43311

Pin Description

Pin Description Pin Type Description

OSC1 I Oscillator Input. Input to the inverting 6 MHz oscillator amplifier.
OSC2 O Oscillator Output. Output of the inverting oscillator amplifier.

LFT I

VREF I Reference Voltage. This is an input pin that should be connected to an external

DP0 B Upstream Plus USB I/O. This pin should be connected to VCC3 through an external

DM0 B Upstream Minus USB I/O
DP[1:4] B Port Plus USB I/O. These pins should be connected to VSS through external 1.5K Ω

DM[1:4] B

OVL[1:4]

PWR[1:4]

I Port Overload. These are the input signals used to indicate to the AT43311 that there

OD Power Switch. These are the output signals used to enable or disable the external

PLL Filter. For proper operation of the PLL, this pin should be connected through a
100 Ω resistor and 10 nF capacitor to ground (V
(see Figure 1–Power Supply Connection).

voltage source. VREF is used internally as the reference voltage by the overload
protection circuit to decide whether there is a problem with a port’s power supply.

1.5K Ω pullup resistor. DP0 and DM0 form the full speed differential signal pin pairs
connected to the Host Controller or an upstream Hub.

resistors. DP[1:4] and DM[1:4] are the differential signal pin pairs to connect
downstream USB devices.

Port Minus USB I/O. These pins should be connected to VSS through external 15K Ω
resistors. DP[1:4] and DM[1:4] are the differential signal pin pairs to connect
downstream USB devices.

is a power supply problem with the port. If OVL
the corresponding PWR[1:4]

voltage regulator supplying power to the port. PWR[1:4]
supply problem is detected at OVL[1:4]

For proper operation of PWR[1:4]
required.

pin and report the status to the USB Host.

.

, an external pull-up resistor of 10K Ω to VCC5 is

) in parallel with a 2.2 nF capacitor

SS

is asserted, the AT433 11 will assert

is de-asserted when a power

STAT[1:4]

V

CC3

V

CC5

V

CCA

GND V Ground

O Connect Status. These are output pins indicating that a port is properly connected.

STAT[1:4]
V 3.3V Power Supply, used for the USB interface
V 5V Power Supply, main power supply for the AT43311
V 5V Analog Power Supply

is asserted when the port is enabled.

3

USB Hub Description

Hub Repeater

The hub repeater i s responsibl e for port conn ectivity set up
and tear-down. The rep eater a lso support s exception han­dling such as bus fault detection and r ecovery, and con­nect/disconnect detection.

When a SOP to ken is detecte d on the upst ream port,
Port0, the AT43311 determines the speed of the transfer.
A USB hub must not propagate a full speed transfer to a
low speed port due to the possible misinterpretation of the
data. The AT43311 will propagate the packet to all enabled
downstream ports.

Note: See USB Specification for further detail on bus
states

The AT43311 supports do wnstream dat a signaling at bo th

1.5 Mbps and 12 Mbps. Devices attached to the down­stream ports are either full speed or low speed depending
on which data line (DP or DM) is pulled hi gh. If a por t is
enumerated as low speed, the output buffers operate at a
slew rate between 75 ns and 300 ns. The AT43311 will not
propagate any traffic to that port unless it is prefaced with a
preamble PID. Low speed data fo llowing the preambl e PID
is propagated to both low and full speed devices. The
AT43311 will enable low speed drivers within four full­speed bit times of the last bit of a preamble PID, and will
disable the drivers at the end of an EOP. The upstream
traffic from any port to the host is prop agated by Port0
using the full speed 4-20 ns slew rate drivers.

All ports are independently driven and monitored on the DP
and DM pins. The AT43311 detects or generates the ‘J’,
‘K’, and SE0 bus s ignal ing st ates. E ach hu b port has s in­gle-ended and differential receivers on its DP and DM lines.
The ports’ I/O buffers comply to the voltage levels and drive
requirements as specified in the USB Specifications Revi­sion 1.0.

The Hub Repeater implements a frame timer that is timed
by the 12 MHz USB clock and is reset every time an SOF
token is received from the Host.

Hub Controller

The hub controller ma nages an d records the op eratio ns of
the AT43311. During enumeration, the controller sends the
host the configuration information. The controller also
allows the host to retrieve the status of the downstream
ports, and power the downs tream ports. The control ler
applies power to the downstream ports on a per port basi s.
After configuration , the co ntrol le r wil l e nab le the p owe r t o a
downstream port upon a SetPortPower command by the
host. The controller supports two endpoints and a Control
Status register.

Serial Interface Engine

The Serial Interface Engine (SIE) converts data between
the serialized USB format and usable data for the controller
and repeater. To carry out these tasks, the SIE is able to
detect or generate USB signaling. Once a valid operation is
detected, the SIE translates the data depending on the
operation.

During a reception, the SIE will use the high speed clock
supplied by the PLL to help synchronize and separate the
synchronization informa tion from th e data. The data mu st
be decoded before the SIE may supply the packet ID to the
controller and repeater.

The USB protocol uses Cyclical Redundancy Check
(CRC), Non Return to Zero Invert (NRZI) data encoding
and bit stuffi ng to i mprov e the re liabil ity of data trans fers.
The SIE must decode the NR ZI and strip o ff the stuffe d bit
to determine the actual data. The CRC information will be
used by the SIE to determine if a transmission error has
occurred. If an error has occurred, the SIE will correct the
data using CRC algorithms.

Control Status Register

Bit Function Value Description

0 Hub configuration status

1 Hub remote wakeup status

2 Endpoint0 STALL status 0

3 Endpoint1 STALL status 0

4

AT43311

0
1

0
1

1

1

Set to 0 or 1 by a Set_Configuration Request

Set to 0 or 1 by ClearFeature or SetFeature request
Default value is 0

Endpoint0 is stalled
Endpoint0 is stalled

Endpoint1 is not stalled
Endpoint1 is stalled

Hub is not currently configured
Hub is currently configured

Hub is currently not enabled to request remote wakeup
Hub is currently enables to request remote wakeup

AT43311

Endpoint0

Endpoint0 i s th e A T4331 1’s defa ult en dpoi nt u sed f or en u­meration of the Hub and exchange of configuration infor­mation and requests between the Host and th e AT43311.
Endpoint0 supports control transfers.

Standard USB Device Requests and class-specific Hub
Requests are supported through Endpoint0.

The Hub Controller supports the fol lowing descriptors
through Endpoint0 (Descriptors are described in detail in
the Descriptors Section of this document):

• Device Descriptor

• Configuration Descriptor

• Interface Descriptor

• Endpoint Descriptor

• Hub Descriptor

Endpoint1

Endpoint1 is used by the Hub Controller to send status
change information to the Hos t. Endpoint1 supp orts inter­rupt transfers.

The Hub Controller samples the c hanges at th e end of
every frame at time marker EO F2 in preparation for a
potential data transfer in the subsequent frame. The sam­pled information is stored as a byte in Statu s Chang e Reg­ister using a bitmap scheme.

Each bit in the Status Change Register corresponds to one
port as shown below.

An IN Token packet from the Host to Endpoi nt1 ind icate s a
request for port change status. If the Hub has not detected
any change on the port s or a ny change s in the hub itself,
then all bits in this register will be 0 and the Hub Controller
will return a NAK to requests on Endpoint1. If a change in
the port status exists, the Hub Controller will transfer the

whole byte. The Hub Controller will continue to report a sta­tus change when polled until that particular change has
been removed by a ClearP ortFeature reques t from the
Host. No status chang e will be reporte d by Endpoi nt1 unti l
the AT43311 has been enumerated and configured by the
Host through Endpoint0.

Power Management

The AT43311 is designed to be powered from the USB
bus. As such, the power co nsumption for the AT43311
itself is less th an 100 m A. Howev er, down stream devices
require separate power supplies. The AT43311 monitors
and controls each power supply to the individual down­stream devices.

Careful design and selection of the power switch is
required to meet the USB specification. The USB specifica­tions requires that the volta ge drop at th e power switch be
no more than 100 mV. USB requirements specify that a
downstream device may use a maximum of 500 mA. These
conditions are best met by using a MOSFET switch with an
on resistance of 200 m

As a sample power circuit, consid er a P-chan nel enhan ce­ment mode MOSFET. The condition of the port’s power is
monitored at the output side of the P MOS switch whi ch is
connected to the port’s OVL[1:4]
condition, the MOSFE T swit ch’s i nte rnal resista nce ca uses
the MOSFET’s output voltage to drop at the OVL[1:4]
the MOSFET’s out put voltage dr ops to less than the volt­age at the VREF voltage reference pin, the AT4331 1 inter­prets this drop as a n overcurrent c ondition. The AT43311
does internal filtering to m ake su re that spurious o r switch ­ing transients are ignore d. If an overcurrent condit ion
exists, the AT43 311 rem oves the power from t hat port b y
de-activating the port’s PWR[1:4]
tion to the Host.

Ω or less.

pin. During an overcurrent

pin. If

pin and reports the condi-

Status Change Register

Bit Function Value Meaning

0 Hub status change 0

1

1 Port1 status change 0

1

2 Port2 status change

3 Port3 status change

4 Port4 status change

5-7 Reserved 0 Default values

0
1

0
1

0
1

No change in status
Change in status detected

No change in status
Change in status detected

No change in status
Change in status detected

No change in status
Change in status detected

No change in status
Change in status detected

5

Figure 1. Power Supply Connection

From upstream power regulator

VCC5 GND VCC3

VREF

3V REG.

AT43311

5.5V

PWR

5V POWER

SUPPLY

OVL

Figure 1 illustrates an example of the power supply con­nection for a AT43311 port.

Careful conside ration mu st be taken to avoid lar ge grou nd
current surges. There is the possibility that the upstream
device and the self powered device will be sourced from
different electri cal powe r outle ts which share no comm on
ground.

When designing the local power supply for the AT4 3311 or
a self powered device , local 5 V power must be isolated.
This isolation can be achieved th rough a transform er or by
proper design of the switching power suppl y. The GND of
the Hub or device can then be safely connected to the
upstream ports ground line for proper operation of the USB
signals.

Even though the devices in a USB network share a com­mon ground (VSS), the t wo 5V supply volta ges of the
AT43311 based hub (the upstream’s bus power and the
local power) must not be connected under any condition.

Port [1:4] Power Control

Each port has signals for port power management and for
port status feedback (PWR[1:4 ]

, OVL[1:4], and STAT[1:4]).
The AT43311 monitors and switches the power to each
port individually.

PWR[1:4]

are open drain outputs that control the power to
the downstream ports. The AT43311 asserts a low value to
ports PWR[1:4]

to turn on the power to the port. During

DP DM

power up, reset, and initialization of the Hu b, PWR[1:4]
in-active. PWR[1:4]

STAT

To downstream device

VCC5

VSS

is

is asserted when the Host instructs the
Hub to power the p ort through the S etPortPower = O N
command. Additionally PWR[1:4]

is de-asserted by the Hub

when an overcurrent condition is detected at the port.
For proper operation of PWR[1:4]

tor to VCC5 is required f or PWR[1:4]

, an external pull-up resis-

pins. To control the
power to the port, any switch with a low voltage d rop with
full power applied is acceptable . The AT43311 is desi gned
for a simple, low cost P-c hannel MOS FET to us e as the
switch.

To detect a port overload, the AT43311 compares OVL[1:4]
to a common VREF defined by the designer.

OVL[1:4]
respective downstre am port. If OVL[1:4]

should be attached to the power supply of the

drops below the
reference voltage VREF for more than 1 ms, the AT43311
treats the drop in voltage as a fault condition on the port’s
power supply. Upon this fault condition, the AT43311 sets
the port’s PORT_OVER_CURRENT status bit and the
port’s C_PORT_OVER_CURRENT bit. The AT43311 will
additionally shut off the power to the port by de-activating
the port’s PWR[1:4]

The STAT[1:4]
tion. STAT[1:4]

signal.

pins are not required by the USB specifica-

provide feedback to the user whenever a
device is properly connected to the port. An LED and series
resistor connected to STAT[1:4]

can be used to provide

6

AT43311

AT43311

visual feedback. The default state of STAT[1:4]
After a port is enabled AT43311 will assert the port’s
STAT[1 :4]

.

is inactive.

Oscillator and Phase-Locked-Loop

To reduce EMI and power dissip ation in the system, the
AT43311 on-chip oscillator is designe d to ope rate wit h a 6
MHz external crystal. An on-chip PLL generates the high
frequency for the clock/data separator of the Serial Inter­face Engine. In the suspended stat e, the oscillator circuitry
is turned off.

A 6 MHz parallel resonance quartz crystal with a load
capacitance of approximately 10 pF is recommended. If the
crystal load capacitor is larger, external capacitors added to
pins OSC1 and OSC2 are recommended. The values for
these capacitors depends on the crystal and the layout of
the board, but typically are 33 pF at OSC1 an d 47 pF at
OSC2. If the crystal used cannot tolerate the drive level s of
the oscillator, a series resistor between OSC2 and the crys­tal pin may be used.

Figure 2. Oscillator and PLL Connection

Figure 2 shows how to properly connect the oscillator for
the AT43311. Ceramic resonators are not recommended
due to the frequency stability required by the USB specifi­cation (0.25%).

If desired, the clock c an be external ly sourced. To clock
externally, connect the clock source to the OSC1 pin, while
leaving the OSC2 pin floating. The switching level at the
OSC1 pin can be as low as 0 .47V ( see electrical specifi ca­tions). A CMOS device is required to drive this pin to main­tain good noise margins at the low switching level.

For proper operation of the PLL, see Figure 1–Power Sup­ply Connection.

To provide the best operating condition for the AT43311,
careful consideration of the power supply connections are
recommended. Use short, low impedance connections to
all power supply lines: VCC5, VCC3, VCCA , and VSS with

0.1 µF decoupling capacitors of high quality adjacent to the
device pins.

Descriptors

The Hub Controller supports the following standard USB
descriptors: Device, Configurat ion, Interface, an d Endpoint
Descriptors, as well as the class specific Hub Descriptor.
All the required Standard Requests and Hub Class-Specific
Requests are supported by the AT43311’s Hub Controller.

7

Device Descriptor

The Device Descriptor provides general information about the AT43311 Hub.

Offset Field Description Size (bytes) Value

0 bLength Define size of descriptor = 18 bytes 1 12H
1 bDescriptorType Device descriptor type 1 01H
2 bcdUSB USB Spec. Release Number = Rev 1.0 2 00H

4 bDeviceClass Class code = HUB_CLASSCODE = 09 1 09 H
5 bDeviceSubClass Subclass code 1 00H
6 bDeviceProtocol Protocol code 1 00H
7 wMaxPacketSize0 Max. packet size for Endpoint0 = 8-bytes 1 08H
9 idVendor Vendor ID = Atmel Corporation 2 EBH

10 idProduct Product ID = AT43311 2 11H

01H

03H

33H

12 bcdDevice

14 iManufacturer Index of string descriptor describing

15 iProduct Index of string descriptor describing product =

16 iSerialNumber Index of string descriptor describing device’s

17 bNumConfigurations Number of possible configurations = 1 1 01H

Device release number
Example: Rev A0 YY = 01 ZZ = 00

Rev B1 YY = 02 ZZ = 01

manufacturer = not supported

not supported

serial no. = not supported

2 ZZH

YYH

100H

100H

100H

8

AT43311

AT43311

Configuration Descriptor

This Configuration Descriptor provides information about the AT43311’s configuration.

Offset Field Description Size (bytes) Value

0 bLength Define size of this descriptor = 9 bytes 1 09H
1 bDescriptorType Descriptor type = Configuration 1 02H

2 wTotalLength

4 bNumInterface
5 bConfigurationValue Argument value for this configuration to be used

6 iConfiguration Index of string descriptor describing this

7 bmAttributes Configuration characteristics = Bus and Self

8 MaxPower Maximum power consumption of USB device

Total length of data returned for this
configuration. Consists of the combined length
of configuration, interface, endpoint and hub
descriptors = 52 bytes

Number of interfaces supported by this
configuration.

by Set Configuration command

configuration (not supported).

Powered with Remote Wakeup

from bus = 100 mA

222H

101H
101H

100H

1E0H

132H

Interface Descriptor

The Interface Descriptor provides information about the single interface which the AT43311 supports.

Offset Field Description Size (bytes) Value

0 bLength Define size of this descriptor = 9 bytes. 1 09H
1 bDescriptorT ype Descriptor type = Interface 1 04H

00H

2 bInterfaceNumber Number of interface = 1, index = 0 1 00H
3 bAlternateSetting Alternate setting value for the interface identified

in the prior field = 0
4 bNumEndpoints Number of endpoints used by this interface = 1 1 01H
5 bInterfaceClass Class code = HUB_CLASSCODE = 09 1 09H
6 bInterfaceSubClass Subclass code = 0 1 00H
7 bInterfaceProtocol Protocol code = 0 1 00H
8 iInterface Index of string descriptor describing this

interface = not supported

100H

100H

9

Endpoint Descriptor

The Endpoint Descriptor describes the Endpoint1 Descriptor which the Hub uses for status change report.

Offset Field Description Size (bytes) Value

0 bLength Define size of this descriptor = 7 bytes 1 07H
1 bDescriptorType Descriptor type = endpoint 1 05H
2 bEndpointAddress The address of the IN endpoint 1 81H
3 bmAttributes Endpoint1 attribute =IN, Interrupt Transfer 1 03H

(1)

4 wMaxPacketSize Max. packet size Endpoint1 is capable of

sending = 1 byte

6 bInterval Interval for polling endpoint for data transfers 1 FFH

Note: 1. Th ere is no endpoi nt d escriptor for Endpoint0.

201H

Hub Descriptor

The Hub Descriptor describes the AT43311’s Hub and ports.

Offset Field Definition Size (bytes) Value

0 bDescLength Define size of this descriptor = 9 bytes 1 09H
1 bDesriptorType Descriptor Type = HUB_DESCRIPTOR = 29 1 29H
2 bNbrPorts Number of downstream ports = 4 1 04H
3 wHubCharacteristics Hub’s characteristics:

= Individual power switching
= Hub is not part of a compound device
= Individual Port Over-current Protection

5 bPwrOn2PwrGood Time from the time power-on sequence begins

on a port until power is good on that port = 100
ms.

6 bHubContrCurrent Maximum current requirements of the hub

electronics = 100 mA.

209H

132H

164H

00H

00H

7 DeviceRemovable Indicates if a port has removable device. All

downstream ports have removable devices

8 PortPwrCtrlMask Indicates if a port is not affected by gang-mode

power control request. All the AT43311’s ports
require manual SetPortFeature
(PORT_POWER) request to control the port’s
power state.

10

AT43311

100H

11EH

AT43311

Standard Requests

All required Standard Requests are supported by the
AT43311. Standard Requests, or commands, are sent to
the AT43311 from the Host on the AT43311’s defau lt pipe,
endpoint0. These requests are made using control trans­fers to endpoint0. The request and request pa rameters are
sent in a Setup packet w hich c onsists of eig ht bytes. The
following sections describe which req uests are supported
by the AT43311 and the corresponding responses as well
as those requests not s upported and responded wi th a
STALL packet.

Clear Device Feature

A Clear Device Feature will disable its remote wakeup fea­ture when the setup packet is:

Field Value

bmRequestType Byte 0 x0000000B
bRequest Byte 1 01H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

01H
00H

00H
00H

00H
00H

Clear Endpoint Feature

The Clear Endpoint Feature request causes the AT 43311
to clear an endpoint’s stall status bit if the condition causing
the stall has been removed. A Clear Endpoint Feature
occurs if a setup packet from the Host is decoded as:

Field V alue

bmRequestType Byte 0 x0000002B
bRequest Byte 1 01H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H
00H

00H for EP0
81H for EP1

00H
00H

00H

Get_Configuration

Get_Configuration returns one byte of data. Bit 0 will be a
copy of bit 0 of the Controller_Status Register. All other bits
will be set to 0. This action will be taken, if the Setup packet
from host is decoded as:

Field Value

bmRequestType Byte 0 10000000B

Clear Interface Feature

AT43311 does no t support thi s feature and wi ll respond
with a STALL if a setup packet from the Host is decoded
as:

Field Value

bmRequestType Byte 0 x0000001B
bRequest Byte 1 01H
wValue

wIndex

wLength

Byte 2
Byte 3

Byte 4
Byte 5

Byte 6
Byte 7

xxH
xxH

xxH
xxH

xxH
xxH

bRequest Byte 1 08H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H
00H

00H
00H

01H
00H

11

Get_Descriptor

Get_Descriptor returns the requ ested desc riptor. The la st
word of the Get_Descriptor request specifies the number of
bytes the AT43311 is to return. If the requested descriptor
is longer than the requested number of bytes, AT43311 will
return only the requested number of bytes from the top of
the descriptor. If the requested descriptor is shorter than
the requested number of bytes, then the AT43311 indicates
the end of the control transfer by sending a short data
packet.

The requested nu mber of bytes from the top of AT 43311’ s
Device Descriptor will be returned, if the Setup packet from
host is decoded as:

Field Value

bmRequestType Byte 0 10000000B
bRequest Byte 1 06H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

00H
01H

00H
00H

Get_Interface

The AT43311 has a single i nterface wit h a value of 0. If it
receives a Get_Interface Request with the value of 0000H
as wIndex (bytes 2 and 3), the AT433 11 w ill retu rn a sing le
byte with a value of 00H. For any other value of wIndex the
AT43311 will return a STALL.

Field Value

bmRequestType Byte 0 10000001B
bRequest Byte 1 0AH
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H
00H

00H
00H

01H
00H

Get Device Status

If the Setup packet from host is decoded as:

Field Value

wLength Byte 6

Byte 7

The requested number of bytes from AT43311’s Configura­tion Descriptor, Interface Descriptor, and Endpoint Descrip­tor will be retu rned, if t he Setup p acket from the Host is
decoded as:

Field Value

bmRequestType Byte 0 10000000B
bRequest Byte 1 06H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

# of bytes

requested

00H
02H

00H
00H

# of bytes

requested

bmRequestType Byte 0 10000000B
bRequest Byte 1 00H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

The Hub will return two bytes of da ta, byte 0 and byte 1, in
little endian order:

Byte 0, Bit 0 = 1, identifying the AT43311 as a self pow­ered device.

Byte 0, Bit 1 = copy of bit 1 of the Controller_Status
Register. This bit reflects whether the AT43311’s
remote wakeup capability is enabled or disabled.

All other bits are set to 0.

00H
00H

00H
00H

02H
00H

12

AT43311

AT43311

Get Interface Status

If the Setup packet from host is decoded as:

Field Value

bmRequestType Byte 0 10000001B
bRequest Byte 1 0x00
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

The Hub will respond with two bytes of data with all 0 value.

0x00
0x00

0xxx
0xxx

0x02
0x00

Get Endpoint Status

Get Endpoint Status returns two -bytes of data indicating
the stall status of the en dpoint. The first bit of the first byte
returned reflects the status of the endpoint stall status bits
of the Controller_Status Register described in section 3.6.
These bits are set or cleared depending whether the end­point is stalled or not:

Current Endpoint Status

Stalled 01H 00H
Not stalled 00H 00H

Get Endpoint Status will execute if the following setup
packet is decoded as:

First
Byte

Second

Byte

Set_Address

Set_Address sets the Hub’s address. The AT43311 will
save the value of bytes 2 and 3 into a temporar y buffer.
After successful completion of the status stage, the
AT43311 transfers the temporary value into the
Hub_Address Register. The Hub_Address will be used as
the Hub’s addres s in al l future transacti ons. Se t_Address
will occur if the Setup packet from the Host is decoded as:

Field Value

bmRequestType Byte 0 x0000000B
bRequest Byte 1 05H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

Device

Address

00H
00H

00H
00H

Set_Configuration

Set_Configuration sets bit 0 of the Controller_Status Regis­ter according to the value of byte 2 of the Setup packet.
The AT43311 has only one configuration. The AT43311 will
only set the bit if byte 2 is either 00H or 01H, and bytes 3 to
7 are all zeroes. For all other values, the Hub will respond
with a STALL handshake packet. Set_Configuration occurs
if the Setup packet from host is decoded as:

Field Value

bmRequestType Byte 0 x0000000B

Field Value

bmRequestType Byte 0 10000010B
bRequest Byte 1 00H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

x0000001B for EP0
10000001B for EP1

00H
00H

00H
02H

00H

bRequest Byte 1 09H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H or 01H

00H
00H

00H
00H

00H

13

Set_Descriptor

The AT43311 does not support this request. In response to
this request, the AT43311 will send a STALL handshake
packet. The Set_Descriptor occurs if the Setup packet from
the Host is decoded as:

Set Endpoint Feature

Set Endpoint Feature sets the stall status bit of the
Controller_Status Register. The stalled endpoint will exhibit
the same behavior as in a stall c ondition. This feature is
activated if a setup packet from the Host is decoded as:

Field Value

bmRequestType Byte 0 00000000B
bRequest Byte 1 07H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

xxH
xxH

xxH
xxH

xxH
xxH

Set Device Feature

Set Device Feature enables the remote wakeup feature if a
setup packet from the Host is decoded as:

Field Value

bmRequestType Byte 0 x0000000B
bRequest Byte 1 03H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

01H
00H

00H
00H

00H
00H

Field Value

bmRequestType Byte 0 x0000010B
bRequest Byte 1 03H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H
00H

00H for EP0
81H for EP1

00H
00H

00H

Set_Interface

The AT43311 has a single interface and responds with a
STALL hands hake packet if a Set_Inte rface reque st is
received with a value other than 0000 H as a wV alu e (b yte s
2 and 3).

Field Value

bmRequestType Byte 0 x0000001B
bRequest Byte 1 0BH
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

00H
00H

00H
00H

Set Interface Feature

AT43311 does no t support thi s feature and wi ll respond
with a STALL if a setup packet from the Host is decoded
as:

Field Value

bmRequestType Byte 0 x0000001B
bRequest Byte 1 03H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

14

AT43311

xxH
xxH

xxH
xxH

xxH
xxH

wLength Byte 6

Byte 7

00H
00H

Sync_Frame

This request is for endpoin ts with isoch ronous trans fers
only which the AT43311 does not suppor t. AT43311 will
send a STALL packet if the setup packe t from the Host i s
decoded as:

Field Value

bmRequestType Byte 0 10000001B
bRequest Byte 1 0CH
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

xxH
xxH

xxH
xxH

xxH
xxH

AT43311

Hub-specific Requests

All required Hub-specific re quests are supported by the
AT43311’s Hub Controll er. Hub-sp ecific re quests or com­mands are sent from the Host to t he AT43311 usi ng the
default pipe (Endp oint0). Hub-specific requests are m ade
using control tra nsfers. The requ est an d request parame­ters are sent in a setup packet consisting of eight bytes.

Clear_Hub_Feature

Clear_Hub_Feature resets a value rep orted in the Hub
Controller status. The status relates to the local power and
over current. AT43311 is a self-powered hub with a bus­powered SIE and does not report over-current on a global
basis.

The Hub Controller will disable the reporting of Local Power
Status (C_HUB_LOCAL_POWER) if the setup packet from
the Host is decoded as:

Field Value

bmRequestType Byte 0 x0100000B
bRequest Byte 1 01BH
wValue Byte 2

Byte 3

00H
00H

Clear_Port_Feature

Clear_Port_Feature disables a port feature. Note that only
the relevant Clear Port commands are supported (see
CLEAR_PORT Features Table).

For example, the PORT_LOW_SPEED value is determined
by the operation of the port of the attached device. Upon an
invalid req uest (e.g. a CLEAR_P ORT request for
PORT_LOW_SPEED), the AT43311 will return a STALL
status to the host.

CLEAR_PORT Features Table

Port Feature

PORT_CONNECTION N N
PORT_ENABLE Y Y
PORT_SUSPEND Y Y
PORT_OVER_CURRENT Y N
PORT_RESET N Y
PORT_POWER Y Y
PORT_LOW_SPEED N N

ClearPort

Feature

SetPort
Feature

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

AT43311 will respond with a STALL if the setup packet
from the Host requests the Hub Controller to clear the Over
Current Indicator (C_HUB_OVER_CURRENT):

Field Value

bmRequestType Byte 0 x0100000B
bRequest Byte 1 01H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H
00H

00H
00H

01H
00H

00H
00H

00H
00H

The Hub Controller will respond to a Clear Port Feature
request if the setup packet from the Host is decoded as:

Field Value

bmRequestType Byte 0 x0100011B
bRequest Byte 1 01H

wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

See Port

Feature

Selector Table

Port

Number

00H
00H

15

Port Feature Selector Table

Feature Value

PORT_CONNECTION 00H
PORT_ENABLE 01H
PORT_SUSPEND 02H
PORT_OVER_CURRENT 03H
PORT_RESET 04H
PORT_POWER 08H
PORT_LOW _SPEED 09H
C_PORT_CONNECTION 10H
C_PORT_ENABLE 11H
C_PORT_SUSPEND 12H
C_PORT_OVER_CURRENT 13H
C_PORT_RESET 14H

Get_Hub_Descriptor

Get_Hub_Descriptor return s the Hub Descr iptor. The l ast
word of the Get_Hub_Descriptor request specifies the
number of bytes AT43311 is to return. If the requested
number of bytes is less than the 9-bytes le ngth of the Hub
Descriptor, AT43311 will return only the request ed number
of bytes from the top of the descriptor. If the requested
number of bytes is more than 9, then the returned d ata wil l
be padded with trailing bytes of zeroes.

This action will be taken if the Setup packet from the Host is
decoded as:

Field Value

bmRequestType Byte 0 10100000B
bRequest Byte 1 06H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

29H
00H

00H
00H

The Hub Contro ller w ill re spond w ith a STA LL if P ort0 or a
port higher than Port4 is addressed in this request.

Get_Bus_State

When a Get_Bus_State is detected , the Hub Co ntroller wi ll
sample the bus status of Ports 1, 2, 3 and 4, at each E OF2
and will store the value in a register known as the
Port_Bus_State registers. The value of the D- signal (pin
DM[1:4]) will be in bi t 0 and the value o f the D+ signal
(DP[1:4]) will be in bit 1of each port’s Port_Bus_State regis­ter. All other bits will be 0. The values of t hese two regi ster
bits will be transferred to the Host upon receipt of the
Get_Bus_State request, if the setup packet fr om Host is
decoded as:

Field Value

bmRequestType Byte 0 10100011B
bRequest Byte 1 02H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H
00H

Port

Number

01H
00H

wLength Byte 6

Byte 7

Number of Bytes

Requested

The Hub Contro ller w ill re spond w ith a STA LL if P ort0 or a
port higher than Port4 is addressed in this request.

16

AT43311

AT43311

Get_Hub_Status

Get_Hub_Status returns the current Hub status that has changed sin ce the p revious acknowled gment of the setup pa cket
of the Host.

The Hub will returned two words of data as described in the following two tables. Word0 is the Hub Status Field, wHubSta­tus, and Word1 is the Hub Change Field,wHubChange.

Hub Status Field, wHubStatus

Bit Description

Local Power Status, indicates the state of the local power supply

0

0 = Local power supply good
1 = Local power supply lost

1

2-15 Reserved. Always read as 0’s

Hub Change Field, wHubChange

Bit Description

0

1

2-15 Reserved. Always read as 0’s.

A Get_Hub_Status will occur if the setup packet is decoded
as:

Field Value

bmRequestType Byte 0 10100000B
bRequest Byte 1 00H
wValue Byte 2

Over-Current Indicator, indicates over-current condition on a global hub basis. AT43311 reports over current
condition on a per port basis therefore this bit is always read as 0

Local Power Status Change, C_HUB_LOCAL_POWER, corresponds to bit 0 of wHubStatus

0 = No change has occurred in local power status
1 = Local power status has changed

Over-Current Indicator Change, C_HUB_OVER_CURRENT, corresponds to bit 1 of wHubStatus. AT43311
reports over current condition on a per port basis and therefore this bit is always read as 0

01H

Byte 3

00H

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H
00H

04H
00H

17

Get_Port_Status

Get_Port_Status returns the current port status and the states that have changed since the previous acknowledgment. The
AT43311 returns two words o f data as described in the f ollowi ng two tables. Word0 i s the P ort Stat us Field, an d Word 1 is
the Port Change Field. The AT43311 will res pond with a STALL if Port0 or a port hig her than Port4 is addressed in this
request.

Port Status Field, wPortStatus

Bit Description

Current Connect Status: PORT_CONNECTION

0

1

2

3

4

0 = no device present on this port
1 = a device is present on this port

Port Enabled/Disabled: PORT_ENABLE

0 = Port is disabled
1 = Port is enabled

Suspend: PORT_SUSPEND

0 = Not suspended
1 = Suspended

Over-Current Indicator: PORT_OVER_CURRENT

0 = Power operation normal for this port
1 = Over-current condition exists for this port. Power to this port has been shut off.

Reset: PORT_RESET

0 = Reset signalling not asserted
1 = Reset signalling asserted

5-7 Reserved. Always read as 0’s.

Port Power: PORT_POWER

8

9

10-15 Reserved. Always read as 0’s

0 = This port is powered OFF
1 = This port is powered ON

Low Speed Device Attached: PORT_LOW_SPEED

0 = Full Speed device attached to this port
1 = Low Speed device attached to this port

18

AT43311

Port Change Field, wPortChange

Bit Description

Connect Status Change: C_PORT_CONNECTION

0

1

2

3

4

5-15 Reserved. Always read as 0’s.

0 = No change has occurred on Current Connect status
1 = Current Connect Status has changed

Port Enable/Disable Change : C_PO RT_ENABLE

0 = No change has occurred on Port Enabled/Disabled status
1 = Port Enabled/Disabled status has changed

Suspend Change: C_PORT_SUSPEND

0 = No change
1 = Resume complete

Over-Current Indicator Change: C_PORT_OVER_CURRENT

0 = No change has occurred on Over-Current indicator
1 = Over-Current indicator has cha nged

Reset Change: C_PORT_RESET

0 = No change
1 = Reset complete

AT43311

Get_Port_Status occurs if the setup packet from host is
decoded as:

Field Value

bmRequestType Byte 0 10100011B
bRequest Byte 1 00BH
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

00H
00H

Port

Number

04H
00H

Set_Hub_Descriptor

The AT43311 has only one Hub Descriptor. Therefore the
AT43311 does not support this request. It wil l respond with
a STALL if the Setup packet from the Host is decoded as:

Field Value

bmRequestType Byte 0 00100000B
bRequest Byte 1 07H
wValue Byte 2

Byte 3

xxH
xxH

Set_Hub_Feature

Set_Hub_Feature sets a value reported in the Hub status.
The status relates to the local power and over curren t. The
AT43311 is a self powered hub with its SIE powered from
the bus. The AT43311 will respond with a STALL if the
setup packet from the Host is decoded as:

Field Value

bmRequestType Byte 0 x0100000B
bRequest Byte 1 03H
wValue Byte 2

Byte 3

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

xxH
xxH

xxH
xxH

xxH
xxH

wIndex Byte 4

Byte 5

wLength Byte 6

Byte 7

xxH
xxH

xxH
xxH

19

Set_Port_Feature

Set_Port_Feature sets a value reported in the Hub Control­ler’s port status. The AT43311 supports all USB required
features. Note that only the relevant Set Port commands
are supported (see SET_PORT Features Table). For
example, the PORT_LOW_SPEED value is determined by
the operation of the port of the attach ed device . Upon an
invalid request (e.g. a Set_PORT request for
PORT_LOW_SPEED), the AT433 11 will return a S TALL
status to the host.

SET_PORT Features Table

Port Feature Selector Table

Feature Value

PORT_CONNECTION 00H
PORT_ENABLE 01H
PORT_SUSPEND 02H
PORT_OVER_CURRENT 03H
PORT_RESET 04H
PORT_POWER 08H

Port Feature

PORT_CONNECTION N N
PORT_ENABLE Y Y
PORT_SUSPEND Y Y
PORT_OVER_CURRENT Y N
PORT_RESET N Y
PORT_POWER Y Y
PORT_LOW_SPEED N N

The status relates to the port features as listed in the Port
Feature Table. AT43311 will respond to Set Port Feature
command if the setup packet from the Host is decoded as:

Field Value

bmRequestType Byte 0 x0100011B
bRequest Byte 1 03H
wValue Byte 2

wIndex Byte 4

ClearPort

Feature

See Port Feature

Byte 3

Byte 5

SetPort
Feature

Selector Table

Port

Number

PORT_LOW _SPEED 09H
C_PORT_CONNECTION 10H
C_PORT_ENABLE 11H
C_PORT_SUSPEND 12H
C_PORT_OVER_CURRENT 13H
C_PORT_RESET 14H

wLength Byte 6

Byte 7

20

AT43311

00H
00H

Absolute Maximum Ratings

AT43311

Operating Temperatu re .....................-55°C to +125° C

Storage Temperatu re ........................ -65 °C to +150° C

Voltage on any pin with

Respect to Ground .................................-0.5V to 7.0V

Maximum Operating Voltage................................6.6V

*NOTICE: Stresses beyond those listed below may cause

permanent damage to th e device . This is a stre ss
rating only and functi ona l operati on of the devi ce
at these or any other conditions beyond those
indicated in the operati ona l sec tions of this spec­ification is not implied. Expos ure to abs olu te
maximum rating conditions for extended periods
may affect device reliability.

DC Output Current ............................................16 mA

DC Characteristics

The values shown in this table are valid for TA = 0°C to 85°C, V

Power Supply

Symbol Parameter Condition Min Max Unit

V

CC5,VCCA

V

CC3

I

CC5

I

CC3

I

CCS

5V Power Supply 4.40 5.25 V
3V Power Supply 3.15 3.45 V
5V Supply Current 100 mA
3V Supply Current 250 µA
Suspended Device Current 250 µA

= 4.4 to 5.25V, V

CC5

= 3V ± 5%, unless otherwise noted.

CC3

USB Signals: DPx, DMx

Symbol Parameter Condition Min Max Unit

I

LO

V

DI

V

CM

V

SE

V

OL1

V

OH1

Hi-Z Data Line Leakage 0V < VIN < 3.3V -10 +10 µA
Differential Input Sensitivity DPx and DMx 0.2 V
Differential Common Mode

Range
Single Ended Receiver

Threshold

0.8 2.5 V

0.8 2.0 V

Static Output Low Voltage RL of 1.5K Ω to 3.6V 0.3 V
Static Output High Voltage RL of 15K Ω to GND 2.8 3.6 V

PWR[1:4], STAT[1:4]

Symbol Parameter Condition Min Max Unit

V
V
V
C

OL1

OH1

OL2

OUT

Output Low Level, STAT[1:4] IOL = 8 mA 0.5 V
Output High Level, STAT[1:4] IOH = 8 mA V

- 0.5V V

CC5

Output Low Level, PWR[1:4] IOL = 4 mA 0.5 V
Output capacitance 1 MHz 10 pF

21

Oscillator Signals: OSC1, OSC2

(1)

Symbol Parameter Condition Min Max Unit

f

OSC

V
V
C
C
C
t

SU

D

LH

HL

X1

X2

1/2

L

Oscillator Frequency 6 MHz ± 0.25% 5.985 6.015 MHz
OSC1 switching level 0.47 1.20 V
OSC1 switching level 0.67 1.44 V
Input capacitance, OSC1 9 pF
Output capacitance, OSC2 9 pF
OSC1/2 capacitance 1 pF
Start-up time 6 MHz, fundamental 10 ms

= 5V, 6 MHz

V

CC5

Drive level

crystal, 120 Ω equiv

5mW

series resistor

Note: 1. OSC2 must not be used to drive other circuitry.

Comparator Signals: VREF, OVL[1:4]

Symbol Parameter Condition Min Max Unit

V

OS

A

O

CM
CM
CM
C

INR

C

INL

IRL

IRH

RR

Input Offset voltage -20 +20 mV
Open loop gain 80 dB
Input CM range low 0 V
Input CM range high V

CC5

CM rejection ratio 1 KHz 92 dB
Input capacitance, VREF# 10 pF
Input capacitance, all other 6 pF

V

AC Characteristics

Dpx, Dmx Driver Characteristics, Full Speed Operation

Symbol Parameter Condition Min Max Unit

T

R

T

F

TRFM TR/TF matching 90 110 %
V

CRS

Z

DRV

22

Rise time CL = 50 pF 4 20 ns
Fall time CL = 50 pF 4 20 ns

Output signal crossover 1.3 2.0 V
Driver output resistance Steady state drive 28 43 Ω

AT43311

AT43311

Dpx, Dmx Data Source Timings, Full Speed Operation

Symbol Parameter Condition Min Max Unit

T

DRATE

T

FRAME

T

DJ1

T

DJ2

T

EOPT

T

DEOP

T

JR1

T

JR2

T

EOPR1

T

EOPR2

Full Speed Data Rate Average Bit Rate 11.97 12.03 Mbs
Frame Interval 0.9995 1.0005 ms
Source Diff Driver Jitter To Next

Transition For Paired Transitions

-3.5

-4.0

3.5

4.0
Source EOP Width 160 175 ns
Differential to EOP Transition

-2 5

Skew
Recvr Data Jitter Tolerance To

Next Transition For Paired
Transitions

EOP Width at Receiver Must
Reject as EOP Must Receive as
EOP

-18.5

-9

40
82

18.5
9

DPx, DMx Driver Characteristics, Low Speed Operation

Symbol Parameter Condition Min Max Unit

T

R

T

R

T

F

T

F

TRFM TR/TF matching 80 120 %

Rise time CL = 50 pF 75 ns
Rise time CL = 350 pF 300 ns
Fall time CL = 50 pF 75 ns
Fall time CL = 350 pF 300 ns

ns
ns

ns

ns
ns

ns
ns

V

CRS

Output signal crossover 1.3 2.0 V

Dpx, Dmx Hub Timings, High Speed Operation

Symbol Parameter Condition

T

HDD1

T

HDD2

T

HDJ1

T

HDJ2

T

SOP

T

EOPD

T

HESK

Hub Differential Data Delay with
cable without cable

Hub Diff Driver Jitter To Next
Transition For Paired T ransitions

Data Bit Width Distortion after
SOP

Hub EOP Delay Relative to
THDD

Hub EOP Output Width Skew -15 15 ns

Min Max Unit

-3

-1

70
40

3
1

ns
ns

ns
ns

-5 3 ns

015ns

23

Dpx, Dmx Hub Timings, Low Speed Operation

Symbol Parameter Condition Min Max Unit

T

LHDD

T

LHDJ1

T

LHDJ2

T

SOP

T

LEOPD

T

LHESK

Hub Differential Data Delay 300 ns
Downstr Hub Diff Driver Jitter T o

Next Transition For Paired
Transitions

Data Bit Width Distortion after
SOP

Hub EOP Delay Relative to
THDD

-45

-15

45
15

ns
ns

-60 4 5 ns

0200ns

Hub EOP Output Width Skew -300 300 ns

24

AT43311