USB4604 datasheet(25/71 Pages) SMSC

25 / 71 page

USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

SMSC USB4604

Revision 1.0 (06-17-13)

DATASHEET

Chapter 5 Modes of Operation

The device provides two main modes of operation: Standby Mode and Hub Mode. The operating mode

of the device is selected by setting values on primary inputs according to the table below.

Note: Refer to Section 8.4.2, "External Chip Reset (RESET_N)," on page 56 for additional information

on RESET_N.

The flowchart in Figure 5.1 shows the modes of operation. It also shows how the device traverses

through the Hub mode stages (shown in bold.) The flow of control is dictated by control register bits

shown in italics as well as other events such as availability of a reference clock. The remaining sections

in this chapter provide more detail on each stage and mode of operation.

Table 5.1 Controlling Modes of Operation

RESET_N

INPUT

RESULTING

MODE

SUMMARY

Standby

Lowest Power Mode: No functions are active other than monitoring the

RESET_N input. All port interfaces are high impedance. All regulators are

powered off.

Hub

Full Feature Mode: Device operates as a configurable USB hub with battery

charger detection. Power consumption is based on the number of active ports,

their speed, and amount of data transferred.

USB4604 데이터시트(PDF) 25 Page - SMSC Corporation