USB3503 datasheet(18/73 Pages) MICROCHIP

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USB3503

DS00001584B-page 18

 2011-2015 Microchip Technology Inc.

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 31 and Section 5.3.29, "Register E7h: Serial Port Interlock Control - SP_ILOCK," on page 29 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 param-

eters.

The following table lists the timing parameters associated with the stages of the Hub Mode.

FIGURE 4-2:

TIMING DIAGRAM FOR HUB STAGES

TABLE 4-2:

TIMING PARAMETERS FOR HUB STAGES

Characteristic

Symbol

MIN

TYP

MAX

Units

Conditions

Hub Initialization

Time

THUBINIT

Hub Configuration

Time-out

THUBCONFIG

Hub Connect Time

THUBCONNECT

RESET_N

Device

Mode.Stage

T_HUBINIT

Standby

Hub.Init

Hub.Config

T_HUBCONFIG

Hub.Connect

T_HUBCONNECT

Hub.Com

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