USB84604 datasheet(23/61 Pages) MICROCHIP

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DS60001295C-page 23

USB84604

5.0

MODES OF OPERATIONS

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.

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 pow-

ered off.

Hub

Full Feature Mode: Device operates as a configurable USB hub. Power con-

sumption is based on the number of active ports, their speed, and amount of

data transferred.

Note:

Refer to Section 8.4.2, "External Chip Reset (RESET_N)," on page 38 for additional information on

RESET_N.

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