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DS000002248A-page 15

USB2502

5.2.2

IN-CIRCUIT EEPROM PROGRAMMING

The EEPROM can be programmed via ATE by pulling RESET_N low (which tri-states the Hub’s EEPROM interface and

allows an external source to program the EEPROM).

5.2.3

EEPROM DATA

5.2.3.1

EEPROM Offset 1:0(h) - Vendor ID

5.2.3.2

EEPROM Offset 3:2(h) - Product ID

TABLE 5-1:

USER-DEFINED DESCRIPTOR DATA

Field

Byte

MSB:

LSB

Size

(Bytes)

Default

CFG

Self

(Hex)

Default

CFG

Bus

(Hex)

Description

VID

1:0

2

0424

0424

Vendor ID (assigned by USB-IF).

PID

3:2

2

2502

2502

Product ID (assigned by Manufacturer).

DID

5:4

2

0000

0000

Device ID (assigned by Manufacturer).

Config Data

Byte 1

6

1

88

0C

Configuration data byte #1 for Hub options.

Config Data

Byte 2

7

1

90

90

Configuration data byte #2 for Hub options.

Non Removable

Device

8

1

00

00

Defines the ports that contain attached devices

(this is used only when Hub is part of a

compound device).

Port Disable

Self-Powered

9

1

00

00

Selects the ports that will be permanently

disabled

Port Disable

Bus-Powered

A

1

00

00

Selects the ports that will be permanently

disabled

Max Power

Self-Powered

B

1

01

01

Max Current for this configuration (expressed

in 2mA units).

Max Power

Bus-Powered

C

1

64

64

Max Current for this configuration (expressed

in 2mA units).

Hub Controller

Max Current

Self-Powered

D

1

01

01

Max Current (expressed in 2mA units).

Hub Controller

Max Current

Bus-Powered

E

1

64

64

Max Current (expressed in 2mA units).

Power-On

Time

F

1

32

32

Time until power is stable.

Bit Number

Bit Name

Description

15:8

VID_MSB

Most Significant Byte of the Vendor ID.

7:0

VID_LSB

Least Significant Byte of the Vendor ID.

Bit Number

Bit Name

Description

15:8

PID_MSB

Most Significant Byte of the Product ID.

7:0

PID_LSB

Least Significant Byte of the Product ID.