USB3503 datasheet(46/82 Pages) SMSC

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USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3503A

Revision 1.1 (02-07-13)

DATASHEET

application. Typical applications are expected to use pullup values between 220Ω and

2.7kΩ for operation at 1MHz on SCL and SDA. Larger pullup resistors may be acceptable

for operation at 400KHz or 100KHz.

6.3

C Message format

6.3.1

Sequential Access Writes

The I2C interface will support sequential writing of the register address space of the USB3503. This

mode is useful for configuring contiguous blocks of registers. Please see section on SOC interface for

address definitions. Figure 6.2 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

USB3503 slave:

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

start address for sequential write operation. Every data access after that is a data write to a data

Sequential write access is terminated by a Stop condition.

6.3.2

Sequential Access Reads

The I2C interface will support direct reading of the USB3503 registers. In order to read one or more

The read register interface supports auto-increment mode. The master should send a NACK instead

of an ACK when the last byte has been transferred.

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

address for sequential read operation to be followed. In the read sequence, every data access is a

data read from a data register where the register address increments after each access. Write

sequence can end with optional Stop (P). If so the Read sequence must start with a Start (S) otherwise

it must start with Repeated Start (Sr).

Figure 6.2 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)

USB3503 Datenblatt(PDF) 46 Page - SMSC Corporation

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