USB5532B datasheet(27/40 Pages) MICROCHIP

No. de pieza	USB5532B

Descripción Electrónicos	2-Port SS/HS USB Hub Controller

PDF	40 Pages

Scroll/Zoom	100%

Fabricante Electrónico	MICROCHIP [Microchip Technology]

Página de inicio	http://www.microchip.com

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27 / 40 page

2-Port SS/HS USB Hub Controller

Datasheet

SMSC USB5532B

Revision 1.2 (05-31-13)

DATASHEET

5.3

Reset

There are two different resets that the device experiences. One is a hardware reset (either from the

internal POR reset circuit or via the RESET_N pin) and the second is a USB Bus Reset.

5.3.1

Internal POR

All reset timing parameters are guaranteed by design.

5.3.2

External Hardware Reset

A valid hardware reset is defined as assertion of RESET_N for a minimum of 1

μs after all power

supplies are within operating range.

Assertion of RESET_N (external pin) causes the following:

1. The PHY is disabled, and the differential pairs will be in a high-impedance state.

2. All transactions immediately terminate; no states are saved.

3. All internal registers return to the default state.

4. The external crystal oscillator is halted.

5. The PLL is halted.

USB5532B Datasheet(PDF) 27 Page - Microchip Technology