Philips ISP1122A Datasheet

ISP1122A

Universal Serial Bus stand-alone hub

	Rev. 01 — 27 March 2000	Preliminary specification

1. General description

The ISP1122A is a stand-alone Universal Serial Bus (USB) hub device which complies with USB Specification Rev. 1.1. It integrates a Serial Interface Engine (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-powered the hub functions are powered by the upstream power supply (VBUS), 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 for easy 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.

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 Universal Serial Bus Specification Rev. 1.1 and ACPI, OnNow and 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

Philips Semiconductors	ISP1122A
	USB stand-alone hub

■Full-scan design with high test coverage

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

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

			ewidth
		upstream
		port			6 MHz
VCC	Vreg(3.3)	D+ D−		LED
5 V					PLL	PACKET	I2C-BUS	SDA
SUPPLY		ANALOG		HUB		GENERATOR	INTERFACE	SCL
REGULATOR		Tx/Rx	GoodLink		BIT CLOCK
ISP1122A
					RECOVERY
3.3 V
			full
							INDV
			speed		PHILIPS	HUB	OPTION
					SIE	CONTROLLER

HUB

END OF

REPEATER

FRAME

TIMERS

										GENERAL
										PORT
										CONTROLLER
ANALOG	GoodLink/	ANALOG	GoodLink/	ANALOG	GoodLink/	ANALOG	GoodLink/	ANALOG	GoodLink/	self/bus
Tx/Rx	POWER SWITCH/	Tx/Rx	POWER SWITCH/	Tx/Rx	POWER SWITCH/	Tx/Rx	POWER SWITCH/	Tx/Rx	POWER SWITCH/	powered
	OC DETECT		OC DETECT		OC DETECT		OC DETECT		OC DETECT

D+ D− overcurrent	LED/	D+ D− overcurrent	LED/	D+ D− overcurrent	LED/	D+ D− overcurrent	LED/	D+ D− overcurrent	LED/
detection	power switch	detection	power switch	detection	power switch	detection	power switch	detection	power switch
downstream		downstream		downstream		downstream		downstream
port 1		port 2		port 3		port 4		port 5	MBL169

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

Fig 1. Block diagram.

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Preliminary specification

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	USB stand-alone hub

5.Pinning information

5.1ISP1122AD (SO32) and ISP1122ANB (SDIP32)

5.1.1Pinning

handbook, halfpage
			Vreg(3.3)									1			32	PSW1/GL1
																DP2
PSW2/GL2												2			31
						GND										DM2
												3			30
						DM3										DP0
												4			29
							DP3									DM0
												5			28
						VCC										DP1
												6			27
																DM1
						OC1						7			26
																DP5
						OC2						8		ISP1122AD	25
																DM5
						OC3						9			24
																INDV/SDA
						OC4						10			23
																OPTION/SCL
			OC5/GOC									11			22
						DM4						12			21	RESET
							DP4					13			20	XTAL2
																XTAL1
				SP/BP								14			19
			HUBGL									15			18	PSW5/GL5/GPSW
PSW3/GL3												16			17	PSW4/GL4
														MBL163

Fig 2. Pin configuration SO32.

handbook, halfpage
			Vreg(3.3)									1		32	PSW1/GL1
															DP2
PSW2/GL2												2		31
						GND									DM2
												3		30
						DM3									DP0
												4		29
							DP3								DM0
												5		28
						VCC									DP1
												6		27
															DM1
						OC1						7		26
															DP5
						OC2						8	ISP1122ANB	25
															DM5
						OC3						9		24
															INDV/SDA
						OC4						10		23
															OPTION/SCL
			OC5/GOC									11		22
						DM4						12		21	RESET
							DP4					13		20	XTAL2
															XTAL1
				SP/BP								14		19
			HUBGL									15		18	PSW5/GL5/GPSW
PSW3/GL3												16		17	PSW4/GL4
													MBL164

Fig 3. Pin configuration SDIP32.

5.1.2Pin description

Table 2: Pin description for SO32 and SDIP32

	Symbol [1]					Pin	Type	Description
	Vreg(3.3) [2]					1	-	regulated supply voltage (3.3 V ± 10%) from internal
								regulator; used to connect pull-up resistor on DP0 line
						2	O	modes 4 to 6: power switch control output for downstream
	PSW2/GL2 [3]
								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
	GND					3	-	ground supply
	DM3					4	AI/O	downstream port 3 D− connection (analog) [4]
	DP3					5	AI/O	downstream port 3 D+ connection (analog) [4]
	VCC					6	-	supply voltage; connect to USB supply VBUS (bus-powered or
								hybrid-powered) or to local supply VDD (self-powered)
						7	AI/I	overcurrent sense input for downstream port 1 (analog [5])
	OC1
						8	AI/I	overcurrent sense input for downstream port 2 (analog [5])
	OC2
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Preliminary specification

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USB stand-alone hub

Table 2: Pin description for SO32 and SDIP32…continued

Symbol [1]

Pin

Type

Description

9

AI/I

overcurrent sense input for downstream port 3 (analog [5])

OC3

10

AI/I

overcurrent sense input for downstream port 4 (analog [5])

OC4

11

AI/I

modes 5, 7: overcurrent sense input for downstream port 5

OC5/GOC [3]

(analog [5])

modes 0, 1, 3: global overcurrent sense input (analog [5])

DM4

12

AI/O

downstream port 4 D− connection (analog) [4]

DP4

13

AI/O

downstream port 4 D+ connection (analog) [4]

14

I

selects power mode:

SP/BP

self-powered: connect to VDD (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]

15

O

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

HUBGL

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

connect to VCC via a 10 kΩ resistor

16

O

modes 4 to 6: power switch control output for downstream

PSW3/GL3 [3]

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

17

O

modes 4 to 6: power switch control output for downstream

PSW4/GL4 [3]

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

18

O

mode 5: power switch control output for downstream port 5

PSW5/GL5/

[3]

(open-drain, 6 mA)

GPSW

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)

[2]

21

I

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

RESET

asynchronous reset; connect to VCC for power-on reset

(internal POR circuit)

OPTION/SCL

22

I/O

mode selection input; also functions as I2C-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

I2C-bus data line (open-drain, 6 mA)

DM5

24

AI/O

downstream port 5 D− connection (analog) [4]

DP5

25

AI/O

downstream port 5 D+ connection (analog) [4]

DM1

26

AI/O

downstream port 1 D− connection (analog) [6]

DP1

27

AI/O

downstream port 1 D+ connection (analog) [6]

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							USB stand-alone hub
	Table 2: Pin description for SO32 and SDIP32…continued
	Symbol [1]				Pin	Type	Description
	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) [6]
	DP2				31	AI/O	downstream port 2 D+ connection (analog) [6]
					32	O	modes 4 to 6: power switch control output for downstream
	PSW1/GL1 [3]
							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 Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.

[3]See Table 4 “Mode selection”.

[4]To disable a downstream port connect both D+ and D− to VCC via 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.

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	USB stand-alone hub

5.2 ISP1122ABD (LQFP32)

5.2.1Pinning

DM3		GND		PSW2/GL2		V		PSW1/GL1		DP2		DM2		DP0
						reg(3.3)
32		31		30		29		28		27		26		25

DP3 1

VCC 2

OC1 3

OC2 4

ISP1122ABD

OC3 5

OC4 6

OC5/GOC 7

DM4 8

9		10		11		12		13		14				15		16
DP4		SP/BP		HUBGL		PSW3/GL3		PSW4/GL4				PSW5/GL5/GPSW		XTAL1		XTAL2

Fig 4. Pin configuration LQFP32.

24 DM0

23 DP1

22 DM1

21 DP5

20 DM5

19 INDV/SDA

18 OPTION/SCL

17 RESET

MBL165

5.2.2Pin description

Table 3: Pin description for LQFP32

	Symbol [1]					Pin	Type	Description
	Vreg(3.3) [2]					29	-	regulated supply voltage (3.3 V ± 10%) from internal
								regulator; used to connect pull-up resistor on DP0 line
						30	O	modes 4 to 6: power switch control output for downstream
	PSW2/GL2 [3]
								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
	GND					31	-	ground supply
	DM3					32	AI/O	downstream port 3 D− connection (analog) [4]
	DP3					1	AI/O	downstream port 3 D+ connection (analog) [4]
	VCC					2	-	supply voltage; connect to USB supply VBUS (bus-powered or
								hybrid-powered) or to local supply VDD (self-powered)
						3	AI/I	overcurrent sense input for downstream port 1 (analog [5])
	OC1
						4	AI/I	overcurrent sense input for downstream port 2 (analog [5])
	OC2
						5	AI/I	overcurrent sense input for downstream port 3 (analog [5])
	OC3
						6	AI/I	overcurrent sense input for downstream port 4 (analog [5])
	OC4
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USB stand-alone hub

Table 3: Pin description for LQFP32…continued

Symbol [1]

Pin

Type

Description

7

AI/I

modes 5, 7: overcurrent sense input for downstream port 5

OC5/GOC [3]

(analog [5])

modes 0, 1, 3: global overcurrent sense input (analog [5])

DM4

8

AI/O

downstream port 4 D− connection (analog) [4]

DP4

9

AI/O

downstream port 4 D+ connection (analog) [4]

10

I

selects power mode:

SP/BP

self-powered: connect to VDD (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]

11

O

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

HUBGL

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

connect to VCC via a 10 kΩ resistor

12

O

modes 4 to 6: power switch control output for downstream

PSW3/GL3 [3]

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

13

O

modes 4 to 6: power switch control output for downstream

PSW4/GL4 [3]

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

14

O

mode 5: power switch control output for downstream port 5

PSW5/GL5/

[3]

(open-drain, 6 mA)

GPSW

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)

[2]

17

I

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

RESET

asynchronous reset; connect to VCC for power-on reset

(internal POR circuit)

OPTION/SCL

18

I/O

mode selection input; also functions as I2C-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

I2C-bus data line (open-drain, 6 mA)

DM5

20

AI/O

downstream port 5 D− connection (analog) [4]

DP5

21

AI/O

downstream port 5 D+ connection (analog) [4]

DM1

22

AI/O

downstream port 1 D− connection (analog) [6]

DP1

23

AI/O

downstream port 1 D+ connection (analog) [6]

DM0

24

AI/O

upstream port D− connection (analog)

DP0

25

AI/O

upstream port D+ connection (analog)

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Philips Semiconductors							ISP1122A
							USB stand-alone hub
	Table 3: Pin description for LQFP32…continued
	Symbol [1]				Pin	Type	Description
	DM2				26	AI/O	downstream port 2 D− connection (analog) [6]
	DP2				27	AI/O	downstream port 2 D+ connection (analog) [6]
					28	O	modes 4 to 6: power switch control output for downstream
	PSW1/GL1 [3]
							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 Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.

[3]See Table 4 “Mode selection”.

[4]To disable a downstream port connect both D+ and D− to VCC via 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.

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.

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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	USB stand-alone hub

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.

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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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, 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

OPTION

SP/BP

PSWn/GLn

PSW5/GL5/GPSW

OCn

OC5/GOC

[1]

[2]

(n = 1 to 4)

(n = 1 to 4)

0

0

0

0

GoodLink

ganged power

inactive

global overcurrent

1

0

0

1

GoodLink

ganged power

inactive

global overcurrent

2

0

1

0

GoodLink

ganged power

inactive [3]

inactive [3]

3

0

1

1

GoodLink [4]

GoodLink [4]

inactive

global overcurrent

4

1

0

0

individual power

inactive

individual

inactive

overcurrent

5

1

0

1

individual power

individual power

individual

individual

overcurrent

overcurrent

6

1

1

0

individual power

inactive

inactive [3]

inactive [3]

7

1

1

1

GoodLink [4]

GoodLink [4]

individual

individual

overcurrent

overcurrent

[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.

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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	Transfer	Direction [1]	Max. packet
			identifier	type		size (bytes)
		0: upstream	0	control	OUT	64
	Hub				IN	64
		1 to 5: downstream
			1	interrupt	IN	1

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

8.1Hub 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.

8.2Hub 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							ISP1122A
								USB stand-alone hub
			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.
9.1			Standard requests
			Table 7 shows the supported standard USB requests. Some requests are explicitly
			unsupported. All other requests will be responded with a STALL packet.
Table 7: Standard USB requests
	Request name	bmRequestType			bRequest	wValue	wIndex	wLength	Data
		byte 0 [7:0]			byte 1	byte 2, 3	byte 4, 5	byte 6, 7
		(Bin)			(Hex)	(Hex)	(Hex)	(Hex)
	Address
	Set Address	X000 0000			05	address [1]	00, 00	00, 00	none
	Configuration
	Get Configuration	1000 0000			08	00, 00	00, 00	01, 00	configuration
									value = 01H
	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	1000 0000			06	00, 02	00, 00	length [2]	configuration,
	Descriptor								interface and
									endpoint
									descriptors
	Get Device Descriptor	1000 0000			06	00, 01	00, 00	length [2]	device
									descriptor
	Get String Descriptor (0)	1000 0000			06	03, 00	00, 00	length [2]	language ID
									string
	Get String Descriptor (1)	1000 0000			06	03, 01	00, 00	length [2]	manufacturer
									string
	Get String Descriptor (2)	1000 0000			06	03, 02	00, 00	length [2]	product string
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	Philips Semiconductors					ISP1122A
						USB stand-alone hub
Table 7: Standard USB requests…continued
	Request name	bmRequestType	bRequest	wValue	wIndex	wLength	Data
		byte 0 [7:0]	byte 1	byte 2, 3	byte 4, 5	byte 6, 7
		(Bin)	(Hex)	(Hex)	(Hex)	(Hex)
	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
	Get Endpoint (0) Status	1000 0010	00	00, 00	00/80 [3], 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	bRequest	wValue	wIndex	wLength	Data
		byte 0 [7:0]	byte 1	byte 2, 3	byte 4, 5	byte 6, 7
		(Bin)	(Hex)	(Hex)	(Hex)	(Hex)
	Descriptor
	Get Hub Descriptor	1010 0000	06	00, 00/29 [1]	00, 00	length [2], 00	hub descriptor
	Feature
	Clear Hub Feature	X010 0000	01	00, 00	00, 00	00, 00	none
	(C_LOCAL_POWER)
	Clear Port Feature	X010 0011	01	feature [3], 00	port [4], 00	00, 00	none
	(feature selectors)
	Set Port Feature	X010 0011	03	feature [3], 00	port [4], 00	00, 00	none
	(feature selectors)
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	Philips Semiconductors					ISP1122A
						USB stand-alone hub
Table 8: Hub specific requests …continued
	Request name	bmRequestType	bRequest	wValue	wIndex	wLength	Data
		byte 0 [7:0]	byte 1	byte 2, 3	byte 4, 5	byte 6, 7
		(Bin)	(Hex)	(Hex)	(Hex)	(Hex)
	Status
	Get Hub Status	1010 0000	00	00, 00	00, 00	04, 00	hub status and
							status change
							field
	Get Port Status	1010 0011	00	00, 00	port [4], 00	04, 00	port status
	Unsupported
	Get Bus Status	1010 0011	02	00, 00	port [4], 00	01, 00	STALL
	Clear Hub Feature	X010 0000	01	01, 00	00, 00	00, 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 uses 00H, USB Specification Rev. 1.1 specifies 29H.

[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).

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	ISP1122A
	USB stand-alone hub

9.3 Descriptors

The ISP1122A hub controller supports the following standard USB descriptors:

•Device

•Configuration

•Interface

•Endpoint

•Hub

•String.

Table 10: Device descriptor

Values in square brackets are optional.

Offset	Field name	Size	Value	Comments
(bytes)		(bytes)	(Hex)
0	bLength	1	12	descriptor length = 18 bytes
1	bDescriptorType	1	01	type = DEVICE
2	bcdUSB	2	10, 01	USB Specification Rev. 1.1
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
				(04CC); can be customized using an
				external EEPROM (see Table 23)
10	idProduct	2	22, 11	ISP1122A product ID; can be
				customized using an external
				EEPROM (see Table 23)
12	bcdDevice	2	01, 01	device release 1.1; silicon revision
				increments this value
14	iManufacturer	1	00	no manufacturer string (default)
			[01]	manufacturer string enabled
				(using an external EEPROM)
15	iProduct	1	00	no product string (default)
			[02]	product string enabled
				(using an external EEPROM)
16	iSerialNumber	1	00	no serial number string
17	bNumConfigurations	1	01	one configuration

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