USB3813 datasheet(33/68 Pages) SMSC

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USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3813

Revision 1.0 (06-17-13)

DATASHEET

7.1.8

JEDEC-ID Read Example

To perform a JEDEC-ID command, the device writes 0x9F into the first byte of the SPI_CMD_BUF.

The length of the transfer is 4 bytes. The device first drives SPI_CE_N low, then SPI_DO is output

with 8 bits of the command, followed by the 24 bits of dummy bytes (due to the length being set to 4).

When the transfer is complete, SPI_CE_N goes high. After the first byte, the data on SPI_DI is clocked

into the SPI_RSP_BUF. At the end of the command, there are three valid bytes in the SPI_RSP_BUF.

In this example, 0xBF, 0x25, 0x8E.

7.2

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 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 SMSC Pro-Touch Programming Tool. For

additional information on the Pro-Touch programming tool, contact your local SMSC sales

representative.

7.2.1

I2C Message Format

7.2.1.1

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 7.7 shows the format of the sequential

Figure 7.6 SPI JEDEC-ID Read Sequence

SPI_CE_N

SPI_CLK

SPI_DO

SPI_DI

MSB

HIGH IMPEDANCE

11 12 13 14 15 16

12 3 4

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

MSB

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