USB2534 datasheet(32/52 Pages) MICROCHIP

32 / 52 page

USB 2.0 Hi-Speed 4-Port Hub Controller

Datasheet

DS00001713A-page 32

 2014 Microchip Technology Inc.

Chapter 7 Device Interfaces

The USB2534 provides multiple interfaces for configuration and external memory access. This chapter

details the various device interfaces and their usage.

Note: For information on device configuration, refer to Chapter 6, "Device Configuration," on page 27.

7.1

I2C Master Interface

The I2C master interface implements a subset of the I2C Master Specification (Please refer to the

Philips Semiconductor Standard I2C-Bus Specification for details on I2C bus protocols). The device’s

I2C master interface is designed to attach to a single “dedicated” I2C EEPROM for loading

configuration data and conforms to the Standard-Mode I2C Specification (100 kbit/s transfer rate and

7-bit addressing) for protocol and electrical compatibility. The device 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.

Note: Extensions to the I2C Specification are not supported.

Note: All device configuration must be performed via the Pro-Touch Programming Tool. For additional

information on the Pro-Touch programming tool, contact your local sales representative.

7.1.1

I2C Message Format

7.1.1.1

Sequential Access Writes

The I2C interface supports sequential writing of the device’s register address space. This mode is

useful for configuring contiguous blocks of registers. Figure 7.1 shows the format of the sequential

write operation. Where color is visible in the figure, blue indicates signaling from the I2C master, and

gray indicates signaling from the slave.

In this operation, following the 7-bit slave address, the 8-bit register address is written indicating the

start address for sequential write operation. Every subsequent access is a data write to a data register,

where the register address increments after each access and an ACK from the slave occurs.

Sequential write access is terminated by a Stop condition.

7.1.1.2

Sequential Access Reads

The I2C interface supports direct reading of the device registers. In order to read one or more register

addresses, the starting address must be set by using a write sequence followed by a read. The read

when the last byte has been transferred.

Figure 7.1 I2C Sequential Access Write Format

7-Bit Slave Address

nnnnnnnn

Data value for

XXXXXX

...

nnnnnnnn

Data value for

XXXXXX + y

xxxxxxxx

Address

(bits 7-0)

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