USB3503 datasheet(23/82 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

device descriptors, port electrical settings such as PHY BOOST, and control features. The SOC

implements the changes using the serial slave port interface to write configuration & control registers.

See Section 5.3.29, "Register E7h: Serial Port Interlock Control - SP_ILOCK," on page 37 for definition

of SP_ILOCK register and how it controls progress through hub stages. If the SP_ILOCK.config_n bit

has its default asserted low and the bit is not written by the serial port, then the USB3503 completes

configuration without any I2C intervention.

If the SP_ILOCK.config_n bit has its default negated high or the SOC negates the bit high using the

serial port during Thubconfig, the USB3503 will remain in the Hub Configuration Stage indefinitely. This

will allow the SOC to update other configuration and control registers without any remaining time-out

restrictions. Once the SP_ILOCK.config_n bit is asserted low by the SOC the device will transition to

the next stage.

4.3.4

Hub Connect Stage (Hub.Connect)

Next, the USB3503 enters the Hub Connect Stage. See Section 5.3.32, "Register EEh: Configure

Portable Hub - CFGP," on page 39 and Section 5.3.29, "Register E7h: Serial Port Interlock Control -

SP_ILOCK," on page 37 for definition of control registers which affect how the device transitions

through the hub stages.

By using the appropriate controls, the USB3503 can be set to immediately transition, or instead to

remain in the Hub Connect Stage indefinitely until one of the SOC handshake events occur. When set

to wait on the handshake, the SOC may read or update any of the serial port registers. Once the SOC

finishes accessing registers and is ready for USB communication to start, it can perform one of the

selected handshakes which that cause the USB3503 to connect within Thubconnect and transition to the

Hub Communication Stage.

4.3.5

Hub Communication Stage (Hub.Com)

Once it exits the Hub Connect Stage, the USB3503 enters Hub Communication Stage. In this stage

full USB operation is supported under control of the USB Host on the upstream port. The USB3503

will remain in the Hub Communication Stage until the operating mode is changed by the system

asserting RESET_N low.

While in the Hub Communication Stage, communication over the serial port is no longer supported and

the resulting behavior of the serial port if accessed is undefined. In order to re-enable the serial port

interface, the device must exit Hub Communication Stage. Exiting this stage is only possible by

entering Standby mode.

4.3.6

Hub Mode Timing Diagram

The following timing diagram shows the progression through the stages of Hub Mode and the

associated timing parameters.

USB3503 Datenblatt(PDF) 23 Page - SMSC Corporation

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