USB2513 datasheet(41/63 Pages) MICROCHIP

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USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251xB/xBi

Revision 2.2 (02-17-12)

DATASHEET

5.1.32

5.2

I2C EEPROM

The SMSC hub can be configured via a 2-wire (I2C) EEPROM (256x8). See Table 5.1 for details on

enabling the I2C EEPROM interface. The I2C EEPROM interface implements a subset of the I2C

Master Specification

(refer to the Philips Semiconductor Standard I2C-Bus Specification I2C protocol

for details). The hub’s interface is designed to attach to a single dedicated I2C EEPROM which

conforms to the Standard-mode I2C specification (100 kbit/s transfer rate and 7-bit addressing) for

protocol and electrical compatibility. The I2C EEPROM shares the same pins as the SMBus interface,

therefore the SMBus interface is not available when the I2C EEPROM interface has been enabled (and

vice versa).

The hub acts as the master and generates the serial clock SCL, controls the bus access (determines

which device acts as the transmitter and which device acts as the receiver), and generates the START

and STOP conditions. The hub will read the external EEPROM for configuration data and then attach

to the upstream USB host.

Note:

If no external EEPROM is present, the hub will write 0 to all configuration registers.

The hub does not have the capacity to write to the external EEPROM. The hub only has the capability

to read from an external EEPROM. The external EEPROM will be read (even if it is blank), and the

hub will be configured with the values that are read. Any values read for unsupported registers will not

be retained (i.e., they will remain as the default values). Reserved registers should be set to 0 unless

otherwise specified. EEPROM reset values are 0x00. Contents read from unavailable registers should

be ignored.

Note:

Go to www.smsc.com, search for USB251xB and select e2prommap.msi from the documents

section to download the EEPROM data configuration utility tool.

5.2.1

I2C Slave Address

The 7-bit slave address is 0101100b.

Note:

10-bit addressing is not supported.

5.2.2

Protocol Implementation

The hub will only access an EEPROM using the sequential read protocol as outlined in Chapter 8 of

MicroChip 24AA02/24LC02B

[4].

BIT

NUMBER

BIT NAME

DESCRIPTION

7:3

rsvd

INTF_PW_DN

SMBus Interface Power Down:

0 : interface is active

1 : interface power down after ACK has completed

RESET

Reset the SMBus interface and internal memory back to RESET_N assertion

default settings.

0 : normal run/idle state

1 : force a reset of registers to their default state

USB_ATTACH

USB Attach (and write protect)

0 : SMBus slave interface is active

1 : the hub will signal a USB attach event to an upstream device, and the

internal memory (address range 0x00-0xFE) is write-protected to prevent

unintentional data corruption.

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