Philips ISP1122ANB, ISP1122AD, ISP1122ABD Datasheet

ISP1122A

Universal Serial Bus stand-alone hub

Rev. 03 — 30 October 2001 Product data

1. General description

The ISP1122A is a stand-alone Universal Serial Bus (USB) hub device which complies with (SIE), hub repeater, hub controller, USB data transceivers and a 3.3 V voltage regulator. It has a conﬁgurable number of downstream ports, ranging from 2 to 5.

The ISP1122A can be bus-powered, self-powered or hybrid-powered. When it is hybrid-poweredthe hub functions are poweredby the upstream power supply (V but the downstream ports are powered by an external 5 Volt supply. The low power consumption in ‘suspend’ mode allows easy design of equipment that is compliant with the ACPI™, OnNow™ and USB power management requirements.

The ISP1122A has built-in overcurrent sense inputs, supporting individual and global overcurrent protection for downstream ports. All ports (including the hub) have GoodLink™ indicator outputs foreasy visual monitoring of USB trafﬁc. The ISP1122A has a serial I2C-bus interface for external EEPROM access and a reduced frequency (6 MHz) crystal oscillator. These features allow signiﬁcant cost savings in system design and easy implementation of advanced USB functionality into PC peripherals.

USB Speciﬁcation Rev. 1.1

. It integrates a Serial Interface Engine

BUS

2. Features

■ High performance USB hub device with integrated hub repeater, hub controller,

Serial Interface Engine (SIE), data transceivers and 3.3 V voltage regulator

■ Complies with

USB power management requirements

■ Conﬁgurable from 2 to 5 downstream ports with automatic speed detection

■ Internal power-on reset and low voltage reset circuit

■ Supports bus-powered, hybrid-powered and self-powered application

■ Individual or ganged power switching for downstream ports

■ Individual or global port overcurrent protection with built-in sense circuits

■ 6 MHz crystal oscillator with on-chip PLL for low EMI

■ Visual USB trafﬁc monitoring (GoodLink™) for hub and downstream ports

■ I2C-bus interface to read vendor ID, product ID and conﬁguration bits from

external EEPROM

■ Operation over the extended USB bus voltage range (4.0 to 5.5 V)

■ Operating temperature range −40 to +85 °C

■ 8 kV in-circuit ESD protection for lower cost of external components

■ Full-scan design with high test coverage

■ Available in 32-pin SDIP, SO and LQFP packages.

Universal Serial Bus Speciﬁcation Rev. 1.1

and ACPI, OnNow and

Philips Semiconductors

ISP1122A

USB stand-alone hub

3. Ordering information

Table 1: Ordering information

Type number Package

Name Description Version

ISP1122AD SO32 plastic small outline package; 32 leads; body width 7.5 mm SOT287-1 ISP1122ANB SDIP32 plastic shrink dual in-line package; 32 leads (400 mil) SOT232-1 ISP1122ABD LQFP32 plastic low proﬁle quad ﬂat package; 32 leads; body 7 x 7 x 1.4 mm SOT358-1

4. Block diagram

pagewidth

upstream

ISP1122A

5 V

SUPPLY

REGULATOR

3.3 V

reg(3.3)

port

D+ D−

ANALOG

Tx/Rx

full speed

LED

HUB

GoodLink

6 MHz

PLL

BIT CLOCK

RECOVERY

PHILIPS

SIE

PACKET

GENERATOR

HUB

CONTROLLER

INDV

OPTION

I2C-BUS

INTERFACE

SDA SCL

HUB

REPEATER

ANALOG

Tx/Rx

POWER SWITCH/

OC DETECT

D+ D− overcurrent

detection

downstream

port 1

GoodLink/

power switch

LED/

ANALOG

Tx/Rx

POWER SWITCH/

OC DETECT

D+ D− overcurrent

detection

downstream

port 2

GoodLink/

power switch

LED/

ANALOG

Tx/Rx

POWER SWITCH/

OC DETECT

D+ D− overcurrent

detection

downstream

port 3

GoodLink/

power switch

LED/

This is a conceptual block diagram and does not include each individual signal.

Fig 1. Block diagram.

ANALOG

Tx/Rx

POWER SWITCH/

OC DETECT

D+ D− overcurrent

detection

downstream

port 4

GoodLink/

power switch

LED/

END OF

FRAME

TIMERS

ANALOG

Tx/Rx

POWER SWITCH/

OC DETECT

D+ D− overcurrent

detection

downstream

port 5

GoodLink/

power switch

LED/

GENERAL

PORT

CONTROLLER

self/bus

powered

MBL169

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Product data Rev. 03 — 30 October 2001 2 of 48

Philips Semiconductors

5. Pinning information

5.1 ISP1122AD (SO32) and ISP1122ANB (SDIP32)

5.1.1 Pinning

ISP1122A

USB stand-alone hub

handbook, halfpage

PSW2/GL2

OC5/GOC

reg(3.3)

GND

DM3

DP3

CC OC1 OC2 OC3 OC4

DM4

DP4

SP/BP

HUBGL

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

ISP1122AD

MBL163

PSW1/GL1 DP2

DM2

DP0

DM0

DP1

DM1

DP5

DM5

INDV/SDA

OPTION/SCL

22 21

RESET XTAL2

XTAL1

19 18

PSW5/GL5/GPSW

PSW4/GL4PSW3/GL3

handbook, halfpage

PSW2/GL2

OC5/GOC

reg(3.3)

GND

DM3

DP3

CC OC1 OC2 OC3 OC4

DM4

DP4

SP/BP

HUBGL

1 2 3 4 5 6 7 8

ISP1122ANB

9 10 11 12 13 14 15 16

MBL164

Fig 2. Pin conﬁguration SO32. Fig 3. Pin conﬁguration SDIP32.

PSW1/GL1 DP2

DM2

DP0

DM0

DP1

DM1

DP5

DM5

INDV/SDA

OPTION/SCL

22 21

RESET XTAL2

XTAL1

19 18

PSW5/GL5/GPSW

PSW4/GL4PSW3/GL3

5.1.2 Pin description

Table 2: Pin description for SO32 and SDIP32

reg(3.3)

[1]

[2]

Pin Type Description

1 - regulated supply voltage (3.3 V ± 10%) from internal

regulator; used to connect pull-up resistor on DP0 line

[3]

2Omodes 4 to 6: power switch control output for downstream

port 2 (open-drain, 6 mA) modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 2 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor

[4] [4]

6 - supply voltage; connect to USB supply V

hybrid-powered) or to local supply V

(bus-poweredor

BUS

(self-powered)

[5]

)

[5]

)

Symbol

PSW2/GL2

GND 3 - ground supply DM3 4 AI/O downstream port 3 D− connection (analog) DP3 5 AI/O downstream port 3 D+ connection (analog) V

OC1 7 AI/I overcurrent sense input for downstream port 1 (analog OC2 8 AI/I overcurrent sense input for downstream port 2 (analog

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Product data Rev. 03 — 30 October 2001 3 of 48

Philips Semiconductors

ISP1122A

USB stand-alone hub

Table 2: Pin description for SO32 and SDIP32

Symbol

[1]

Pin Type Description

OC3 9 AI/I overcurrent sense input for downstream port 3 (analog OC4 10 AI/I overcurrent sense input for downstream port 4 (analog OC5/GOC

[3]

11 AI/I modes 5, 7: overcurrent sense input for downstream port 5

(analog

[5]

)

modes 0, 1, 3: global overcurrent sense input (analog DM4 12 AI/O downstream port 4 D− connection (analog) DP4 13 AI/O downstream port 4 D+ connection (analog)

…continued

[5] [5]

[5] [4] [4]

SP/BP 14 I selects power mode:

self-powered: connect to V

(local power supply); also use

this mode for hybrid-powered operation bus-powered:connect to GND; disable downstream port 5 to

meet supply current requirements

[4]

HUBGL 15 O hub GoodLink LED indicator output (open-drain, 6 mA);

to connect an LED use a 330 Ω series resistor; if unused

via a 10 kΩ resistor

PSW3/GL3

connect to V

[3]

16 O modes 4 to 6: power switch control output for downstream

port 3 (open-drain, 6 mA) modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 3 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor

PSW4/GL4

[3]

17 O modes 4 to 6: power switch control output for downstream

port 4 (open-drain, 6 mA) modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 4 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor

PSW5/GL5/

[3]

GPSW

18 O mode 5: power switch control output for downstream port 5

(open-drain, 6 mA) modes 3, 7: GoodLink LED indicator output for downstream

port 5 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor

modes 0 to 2: gang mode power switch control output

(open-drain, 6 mA) XTAL1 19 I crystal oscillator input (6 MHz) XTAL2 20 O crystal oscillator output (6 MHz) RESET

[2]

21 I reset input (Schmitt trigger); a LOW level produces an

asynchronous reset; connect to V

for power-on reset

(internal POR circuit)

OPTION/SCL 22 I/O mode selection input; also functions as I

C-bus clock output

(open-drain, 6 mA) INDV/SDA 23 I/O selects individual (HIGH) or global (LOW) power switching

and overcurrent detection; also functions as bidirectional

C-bus data line (open-drain, 6 mA)

I DM5 24 AI/O downstream port 5 D− connection (analog) DP5 25 AI/O downstream port 5 D+ connection (analog) DM1 26 AI/O downstream port 1 D− connection (analog) DP1 27 AI/O downstream port 1 D+ connection (analog)

[4] [4] [6] [6]

) )

)

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Product data Rev. 03 — 30 October 2001 4 of 48

Philips Semiconductors

ISP1122A

USB stand-alone hub

Table 2: Pin description for SO32 and SDIP32

Symbol

[1]

Pin Type Description

…continued

DM0 28 AI/O upstream port D− connection (analog) DP0 29 AI/O upstream port D+ connection (analog) DM2 30 AI/O downstream port 2 D− connection (analog) DP2 31 AI/O downstream port 2 D+ connection (analog) PSW1/GL1

[3]

32 O modes 4 to 6: power switch control output for downstream

[6] [6]

port 1 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 1 (open-drain, 6 mA); to connect an LED

use a 330 Ω series resistor

[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals. [2] The voltage at pin V

connecting RESET to V [3] See Table 4 “Mode selection”. [4] To disable a downstream port connect both D+ and D− to VCCvia a 1 MΩ resistor; unused ports must

be disabled in reverse order starting from port 5. [5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case,

the pin functions as a logic input (TTL level). [6] Downstream ports 1 and 2 cannot be disabled.

is gated by the RESET pin. This allows fully self-powered operation by

reg(3.3)

(+5 V USB supply). If V

BUS

is lost upstream port D+ will not be driven.

BUS

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Product data Rev. 03 — 30 October 2001 5 of 48

Philips Semiconductors

5.2 ISP1122ABD (LQFP32)

5.2.1 Pinning

dth

ISP1122A

USB stand-alone hub

DM3 32

DP3

OC1

OC2

OC3

OC4

DM4

7 8

DP4

OC5/GOC

Fig 4. Pin conﬁguration LQFP32.

GND

PSW2/GL2

ISP1122ABD

SP/BP

HUBGL

reg(3.3)

PSW1/GL1

PSW3/GL3

PSW4/GL4

DP2

DM2

DP0

MBL165

XTAL1

XTAL2

PSW5/GL5/GPSW

DM0

DP1

DM1

DP5

DM5

INDV/SDA

OPTION/SCL

RESET

5.2.2 Pin description

Table 3: Pin description for LQFP32

reg(3.3)

[1]

[2]

Pin Type Description

29 - regulated supply voltage (3.3 V ± 10%) from internal

regulator; used to connect pull-up resistor on DP0 line

[3]

30 O modes 4 to 6: power switch control output for downstream

port 2 (open-drain, 6 mA) modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 2 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor

[4] [4]

2 - supply voltage; connect to USB supply V

hybrid-powered) or to local supply V

(bus-poweredor

BUS

(self-powered)

[5]

)

[5]

)

[5]

)

[5]

)

Symbol

PSW2/GL2

GND 31 - ground supply DM3 32 AI/O downstream port 3 D− connection (analog) DP3 1 AI/O downstream port 3 D+ connection (analog) V

OC1 3 AI/I overcurrent sense input for downstream port 1 (analog OC2 4 AI/I overcurrent sense input for downstream port 2 (analog OC3 5 AI/I overcurrent sense input for downstream port 3 (analog OC4 6 AI/I overcurrent sense input for downstream port 4 (analog

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Product data Rev. 03 — 30 October 2001 6 of 48

Philips Semiconductors

ISP1122A

USB stand-alone hub

Table 3: Pin description for LQFP32

Symbol

OC5/GOC

[1]

Pin Type Description

[3]

7 AI/I modes 5, 7: overcurrent sense input for downstream port 5

(analog

modes 0, 1, 3: global overcurrent sense input (analog DM4 8 AI/O downstream port 4 D− connection (analog) DP4 9 AI/O downstream port 4 D+ connection (analog)

…continued

[5]

)

[5] [4] [4]

SP/BP 10 I selects power mode:

self-powered: connect to V

(local power supply); also use

this mode for hybrid-powered operation bus-powered:connect to GND; disable downstream port 5 to

meet supply current requirements

[4]

HUBGL 11 O hub GoodLink LED indicator output (open-drain, 6 mA);

to connect an LED use a 330 Ω series resistor; if unused

via a 10 kΩ resistor

PSW3/GL3

connect to V

[3]

12 O modes 4 to 6: power switch control output for downstream

port 3 (open-drain, 6 mA) modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 3 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor

PSW4/GL4

[3]

13 O modes 4 to 6: power switch control output for downstream

port 4 (open-drain, 6 mA) modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 4 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor

PSW5/GL5/

[3]

GPSW

14 O mode 5: power switch control output for downstream port 5

(open-drain, 6 mA) modes 3, 7: GoodLink LED indicator output for downstream

port 5 (open-drain, 6 mA); to connect an LED use a 330 Ω series resistor

modes 0 to 2: gang mode power switch control output

(open-drain, 6 mA) XTAL1 15 I crystal oscillator input (6 MHz) XTAL2 16 O crystal oscillator output (6 MHz) RESET

[2]

17 I reset input (Schmitt trigger); a LOW level produces an

asynchronous reset; connect to V

for power-on reset

(internal POR circuit)

OPTION/SCL 18 I/O mode selection input; also functions as I

C-bus clock output

(open-drain, 6 mA) INDV/SDA 19 I/O selects individual (HIGH) or global (LOW) power switching

and overcurrent detection; also functions as bidirectional

C-bus data line (open-drain, 6 mA)

I DM5 20 AI/O downstream port 5 D− connection (analog) DP5 21 AI/O downstream port 5 D+ connection (analog) DM1 22 AI/O downstream port 1 D− connection (analog) DP1 23 AI/O downstream port 1 D+ connection (analog)

[4] [4] [6] [6]

DM0 24 AI/O upstream port D− connection (analog) DP0 25 AI/O upstream port D+ connection (analog)

)

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Product data Rev. 03 — 30 October 2001 7 of 48

Philips Semiconductors

ISP1122A

USB stand-alone hub

Table 3: Pin description for LQFP32

Symbol

DM2 26 AI/O downstream port 2 D− connection (analog) DP2 27 AI/O downstream port 2 D+ connection (analog) PSW1/GL1

[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals. [2] The voltage at pin V

[3] See Table 4 “Mode selection”. [4] To disable a downstream port connect both D+ and D− to VCCvia a 1 MΩ resistor; unused ports must

[5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case,

[6] Downstream ports 1 and 2 cannot be disabled.

[1]

connecting RESET to V

be disabled in reverse order starting from port 5.

the pin functions as a logic input (TTL level).

6. Functional description

The ISP1122A is a stand-alone USB hub with up to 5 downstream ports. The number of ports can be conﬁgured between 2 and 5. The downstream ports can be used to connect low-speed or full-speed USB peripherals. All standard USB requests from the host are handled by the hardware without the need for ﬁrmware intervention. The block diagram is shown in Figure 1.

…continued

Pin Type Description

[6] [6]

[3]

28 O modes 4 to 6: power switch control output for downstream

port 1 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 1 (open-drain, 6 mA); to connect an LED

use a 330 Ω series resistor

is gated by the RESET pin. This allows fully self-powered operation by

reg(3.3)

(+5 V USB supply). If V

BUS

is lost upstream port D+ will not be driven.

BUS

The ISP1122A requires only a single supply voltage. An internal 3.3 V regulator provides the supply voltage for the analog USB data transceivers.

The ISP1122A supports both bus-powered and self-powered hub operation. When using bus-powered operation a downstream port cannot supply more than 100 mA to a peripheral. In case of self-powered operation an external supply is used to power the downstream ports, allowing a current consumption of max. 500 mA per port.

A basic I2C-bus interface is provided for reading vendor ID, product ID and conﬁguration bits from an external EEPROM upon a reset.

6.1 Analog transceivers

The integrated transceiver interfaces directly to the USB cables through external termination resistors. They are capable of transmitting and receiving serial data at both ‘full-speed’ (12 Mbit/s) and ‘low-speed’ (1.5 Mbit/s) data rates. The slew rates are adjusted according to the speed of the device connected and lie within the range mentioned in the

USB Speciﬁcation Rev. 1.1

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Product data Rev. 03 — 30 October 2001 8 of 48

Philips Semiconductors

6.2 Philips Serial Interface Engine (SIE)

The Philips SIE implements the full USB protocol layer. It is completely hardwired for speed and needs no ﬁrmware intervention. The functions of this block include: synchronization pattern recognition, parallel/serial conversion, bit (de-)stufﬁng, CRC checking/generation, Packet IDentiﬁer (PID) veriﬁcation/generation, address recognition, handshake evaluation/generation.

6.3 Hub repeater

The hub repeater is responsible for managing connectivity on a ‘per packet’ basis. It implements ‘packet signalling’ and ‘resume’ connectivity. Low-speed devices can be connected to downstream ports. If a low-speed device is detected the repeater will not propagate upstream packets to the corresponding port, unless they are preceded by a PREAMBLE PID.

6.4 End-of-frame timers

This block contains the speciﬁed EOF1 and EOF2 timers which are used to detect ‘loss-of-activity’ and ‘babble’ error conditions in the hub repeater. The timers also maintain the low-speed keep-alive strobe which is sent at the beginning of a frame.

ISP1122A

USB stand-alone hub

6.5 General and individual port controller

The general and individual port controllers together provide status and control of individual downstream ports. Any port status change will be reported to the host via the hub status change (interrupt) endpoint.

6.6 GoodLink

Indication of a good USB connection is provided through GoodLink technology. An LED can be directly connected via an external 330 Ω resistor.

During enumeration the LED blinks on momentarily. After successful conﬁguration of the ISP1122A, the LED is permanently on. The LED blinks off for 100 ms upon each successful packet transfer (with ACK). The hub GoodLink indicator blinks when the hub receives a packet addressed to it. Downstream GoodLink indicators blink upon an acknowledgment from the associated port. In ‘suspend’ mode the LED is off.

This feature provides a user-friendly indication of the status of the hub, the connected downstream devices and the USB trafﬁc. It is a useful diagnostics tool to isolate faulty USB equipment and helps to reduce ﬁeld support and hotline costs.

6.7 Bit clock recovery

The bit clock recovery circuit recovers the clock from the incoming USB data stream using a 4× oversampling principle. It is able to track jitter and frequency drift as speciﬁed by the

USB Speciﬁcation Rev. 1.1

6.8 Voltage regulator

A 5 to 3.3 V DC-DC regulator is integrated on-chip to supply the analog transceiver and internal logic. This can also be used to supply the terminal 1.5 kΩ pull-up resistor on the D+ line of the upstream connection.

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Product data Rev. 03 — 30 October 2001 9 of 48

Philips Semiconductors

6.9 PLL clock multiplier

A 6 to 48 MHz clock multiplier Phase-Locked Loop (PLL) is integrated on-chip. This allows for the use of low-cost 6 MHz crystals. The low crystal frequency also minimizes Electro-Magnetic Interference (EMI). The PLL requires no external components.

6.10 Overcurrent detection

An overcurrent detection circuit for downstream ports has been integrated on-chip. It is self-reporting, resets automatically, has a low trip time and requires no external components. Both individual and global overcurrent detection are supported.

6.11 I2C-bus interface

A basic serial I2C-bus interface (single master, 100 kHz) is provided to read VID, PID and conﬁguration bits from an external I2C-bus EEPROM (e.g. Philips PCF8582 or equivalent). At reset the ISP1122A reads 6 bytes of data from the external memory.

The I2C-bus interface timing complies with the standard mode of operation as described in

The I2C-bus and how to use it

ISP1122A

USB stand-alone hub

, order number 9398 393 40011.

7. Modes of operation

The ISP1122A has several modes of operation, each corresponding with a different pin conﬁguration. Modes are selected by means of pins INDV, OPTION and SP/BP, as shown in Table 4.

Table 4: Mode selection

Mode INDV

0000GoodLink ganged power inactive global overcurrent 1001GoodLink ganged power inactive global overcurrent 2010GoodLink ganged power inactive 3011GoodLink 4100individual power inactive individual

5101individual power individual power individual

6110individual power inactive inactive 7111GoodLink

[1] Port power switching: logic 0 = ganged, logic 1 = individual. [2] Power mode: logic 0 = bus-powered, logic 1 = self-powered (or hybrid-powered). [3] No overcurrent detection. [4] No power switching.

[1]

OPTION SP/BP

[2]

PSWn/GLn (n = 1 to 4)

PSW5/GL5/GPSW OCn

[4]

GoodLink

[4]

(n = 1 to 4)

[3]

inactive global overcurrent

overcurrent

[3]

individual overcurrent

OC5/GOC

inactive

individual overcurrent

inactive individual

overcurrent

[3]

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Product data Rev. 03 — 30 October 2001 10 of 48

Philips Semiconductors

8. Endpoint descriptions

Each USB device is logically composed of several independent endpoints. An endpoint acts as a terminus of a communication ﬂow between the host and the device. At design time each endpoint is assigned a unique number (endpoint identiﬁer, see Table 5). The combination of the device address (given by the host during enumeration), the endpoint number and the transfer direction allows each endpoint to be uniquely referenced.

The ISP1122A has two endpoints, endpoint 0 (control) and endpoint 1 (interrupt).

Table 5: Hub endpoints

Function Ports Endpoint

Hub

[1] IN: input for the USB host; OUT: output from the USB host.

0: upstream 1 to 5: downstream

ISP1122A

USB stand-alone hub

identiﬁer

0 control

1 interrupt IN 1

Transfer type

Direction

OUT 64 IN 64

[1]

Max. packet size (bytes)

8.1 Hub endpoint 0 (control)

All USB devices and functions must implement a default control endpoint (ID = 0). This endpoint is used by the host to conﬁgure the device and to perform generic USB status and control access.

The ISP1122A hub supports the following USB descriptor information through its control endpoint 0, which can handle transfers of 64 bytes maximum:

Device descriptor

•

Conﬁguration descriptor

•

Interface descriptor

•

Endpoint descriptor

•

Hub descriptor

•

String descriptor.

•

8.2 Hub endpoint 1 (interrupt)

Endpoint 1 is used by the ISP1122A hub to provide status change information to the host. This endpoint can be accessed only after the hub has been conﬁgured by the host (by sending the Set Conﬁguration command).

Endpoint 1 is an interrupt endpoint: the host polls it once every 255 ms by sending an IN token. If the hub has detected no change in the port status it returns a NAK (Not AcKnowledge) response to this request, otherwise it sends the Status Change byte (see Table 6).

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Philips Semiconductors

Table 6: Status Change byte: bit allocation

Bit Symbol Description

0 Hub SC a logic 1 indicates a status change on the hub’s upstream port 1 Port 1 SC a logic 1 indicates a status change on downstream port 1 2 Port 2 SC a logic 1 indicates a status change on downstream port 2 3 Port 3 SC a logic 1 indicates a status change on downstream port 3 4 Port 4 SC a logic 1 indicates a status change on downstream port 4 5 Port 5 SC a logic 1 indicates a status change on downstream port 5 6 reserved not used 7 reserved not used

9. Host requests

The ISP1122A handles all standard USB requests from the host via control endpoint 0. The control endpoint can handle a maximum of 64 bytes per transfer.

Remark: Please note that the USB data transmission order is Least Signiﬁcant Bit (LSB) ﬁrst. In the following tables multi-byte variables are displayed least signiﬁcant byte ﬁrst.

ISP1122A

USB stand-alone hub

9.1 Standard requests

Table 7 shows the supported standard USB requests. Some requests are explicitly

unsupported. All other requests will be responded to with a STALL packet.

Table 7: Standard USB requests

Request name bmRequestType

Address

Set Address X000 0000 05 address

Conﬁguration

Get Conﬁguration 1000 0000 08 00, 00 00, 00 01, 00 conﬁguration

Set Conﬁguration (0) X000 0000 09 00, 00 00, 00 00, 00 none Set Conﬁguration (1) X000 0000 09 01, 00 00, 00 00, 00 none

Descriptor

Get Conﬁguration Descriptor

Get Device Descriptor 1000 0000 06 00, 01 00, 00 length

Get String Descriptor (0) 1000 0000 06 03, 00 00, 00 length

Get String Descriptor (1) 1000 0000 06 03, 01 00, 00 length

Get String Descriptor (2) 1000 0000 06 03, 02 00, 00 length

byte 0 [7:0] (Bin)

1000 0000 06 00, 02 00, 00 length

bRequest byte 1 (Hex)

wValue byte 2, 3 (Hex)

wIndex byte 4, 5 (Hex)

[1]

00, 00 00, 00 none

wLength byte 6, 7 (Hex)

Data

value = 01H

[2]

conﬁguration, interface and endpoint descriptors

device descriptor

language ID string

manufacturer string

product string

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Philips Semiconductors

ISP1122A

USB stand-alone hub

Table 7: Standard USB requests

Request name bmRequestType

byte 0 [7:0] (Bin)

…continued

bRequest byte 1 (Hex)

wValue byte 2, 3 (Hex)

wIndex byte 4, 5 (Hex)

wLength byte 6, 7 (Hex)

Data

Feature

Clear Device Feature

X000 0000 01 01, 00 00, 00 00, 00 none

(REMOTE_WAKEUP) Clear Endpoint (1)

X000 0010 01 00, 00 81, 00 00, 00 none

Feature (HALT/STALL) Set Device Feature

X000 0000 03 01, 00 00, 00 00, 00 none

(REMOTE_WAKEUP) Set Endpoint (1)

X000 0010 03 00, 00 81, 00 00, 00 none

Feature (HALT/STALL)

Status

Get Device Status 1000 0000 00 00, 00 00, 00 02, 00 device status Get Interface Status 1000 0001 00 00, 00 00, 00 02, 00 zero

[3]

Get Endpoint (0) Status 1000 0010 00 00, 00 00/80

, 00 02, 00 endpoint 0

status

Get Endpoint (1) Status 1000 0010 00 00, 00 81, 00 02, 00 endpoint 1

status

Unsupported

Set Descriptor 0000 0000 07 XX, XX XX, XX XX, XX descriptor;

STALL Get Interface 1000 0001 0A 00, 00 XX, XX 01, 00 STALL Set Interface X000 0001 0B XX, XX XX, XX 00, 00 STALL Synch Frame 1000 0010 0C 00, 00 XX, XX 02, 00 STALL

[1] Device address: 0 to 127. [2] Returned value in bytes. [3] MSB speciﬁes endpoint direction: 0 = OUT, 1 = IN. The ISP1122A accepts either value.

9.2 Hub speciﬁc requests

In Table 8 the supported hub speciﬁc requests are listed, as well as some unsupported requests. Table 9 provides the feature selectors for setting or clearing port features.

Table 8: Hub speciﬁc requests

Request name bmRequestType

byte 0 [7:0] (Bin)

Descriptor

Get Hub Descriptor 1010 0000 06 00, 00/29

Feature

Clear Hub Feature

X010 0000 01 00, 00 00, 00 00, 00 none

(C_LOCAL_POWER) Clear Port Feature

X010 0011 01 feature

(feature selectors) Set Port Feature

X010 0011 03 feature

(feature selectors)

bRequest byte 1 (Hex)

wValue byte 2, 3 (Hex)

[1]

[3]

, 00 port

[3]

, 00 port

wIndex byte 4, 5 (Hex)

00, 00 length

wLength byte 6, 7 (Hex)

[2]

, 00 hub descriptor

[4]

, 00 00, 00 none

[4]

, 00 00, 00 none

Data

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ISP1122A

USB stand-alone hub

Table 8: Hub speciﬁc requests

Request name bmRequestType

…continued

byte 0 [7:0] (Bin)

bRequest byte 1 (Hex)

wValue byte 2, 3 (Hex)

wIndex byte 4, 5 (Hex)

wLength byte 6, 7 (Hex)

Data

Status

Get Hub Status 1010 0000 00 00, 00 00, 00 04, 00 hubstatus and

status change

ﬁeld

[4]

Get Port Status 1010 0011 00 00, 00 port

, 00 04, 00 port status

Unsupported

[4]

Get Bus Status 1010 0011 02 00, 00 port Clear Hub Feature

X010 0000 01 01, 00 00, 00 00, 00 STALL

, 00 01, 00 STALL

(C_OVER_CURRENT) Set Hub Descriptor 0010 0000 07 XX, XX 00, 00 3E, 00 STALL Set Hub Feature

X010 0000 03 00, 00 00, 00 00, 00 STALL

(C_LOCAL_POWER) Set Hub Feature

X010 0000 03 01, 00 00, 00 00, 00 STALL

(C_OVER_CURRENT)

[1]

USB Speciﬁcation Rev. 1.0

[2] Returned value in bytes. [3] Feature selector value, see Table 9. [4] Downstream port identiﬁer: 1 to N with N = number of enabled ports (2 to 5).

uses 00H,

USB Speciﬁcation Rev. 1.1

speciﬁes 29H.

Table 9: Port feature selectors

Feature selector name Value (Hex) Set feature Clear feature

PORT_CONNECTION 00 not used not used PORT_ENABLE 01 not used disables a port PORT_SUSPEND 02 suspends a port resumes a port PORT_OVERCURRENT 03 not used not used PORT_RESET 04 resets and enables a

not used

port PORT_POWER 08 powers on a port powers off a port PORT_LOW_SPEED 09 not used not used C_PORT_CONNECTION 10 not used clears port connection

change bit

C_PORT_ENABLE 11 not used clears port enable

change bit

C_PORT_SUSPEND 12 not used clears port suspend

change bit

C_PORT_OVERCURRENT 13 not used clears port overcurrent

change bit

C_PORT_RESET 14 not used clears port reset

change bit

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Philips Semiconductors

9.3 Descriptors

The ISP1122A hub controller supports the following standard USB descriptors:

•

Table 10: Device descriptor

Values in square brackets are optional.

Offset (bytes)

0 bLength 1 12 descriptor length = 18 bytes 1 bDescriptorType 1 01 type = DEVICE 2 bcdUSB 2 10, 01 4 bDeviceClass 1 09 HUB_CLASSCODE 5 bDeviceSubClass 1 00 6 bDeviceProtocol 1 00 7 bMaxPacketSize0 1 40 packet size = 64 bytes 8 idVendor 2 CC, 04 Philips Semiconductors vendor ID

10 idProduct 2 22, 11 ISP1122A product ID; can be

12 bcdDevice 2 01, 01 device release 1.1; silicon revision

14 iManufacturer 1 00 no manufacturer string (default)

15 iProduct 1 00 no product string (default)

16 iSerialNumber 1 00 no serial number string 17 bNumConﬁgurations 1 01 one conﬁguration

Device Conﬁguration Interface Endpoint Hub String.

Field name Size

(bytes)

ISP1122A

USB stand-alone hub

Value (Hex)

[01] manufacturer string enabled

[02] product string enabled

Comments

USB Speciﬁcation Rev. 1.1

(04CC); can be customized using an external EEPROM (see Table 23)

customized using an external EEPROM (see Table 23)

increments this value

(using an external EEPROM)

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