USB2513 datasheet(38/57 Pages) MICROCHIP

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USB251xB/xBi

DS00001692C-page 38

 2010 - 2015 Microchip Technology Inc.

5.5.1.3

RESET_N for SMBus Slave Configuration

Note 5-3

All power supplies must have reached the operating levels mandated in Section 6.0, "DC

Parameters", prior to (or coincident with) the assertion of RESET_N.

Note 5-4

10 ms for hubs, 50 ms for root ports.

5.5.2

USB BUS RESET

In response to the upstream port signaling a reset to the hub, the hub does the following:

Sets default internal USB address to 0

Sets configuration to: unconfigured

Negates PRTPWR[x:1] to all downstream ports unless battery charging (BC_EN[x:1]) is enabled

Clears all TT buffers

Moves device from suspended to active (if suspended)

Complies with Section 11.10 of the USB 2.0 Specification [1] for behavior after completion of the reset sequence.

The host then configures the hub and the hub’s downstream port devices in accordance with the USB Specifica-

tion

FIGURE 5-3:

RESET_N TIMING FOR SMBUS MODE

Name

Description

MIN

TYP

MAX

Units

RESET_N Asserted

s

CFG_SEL[1:0] setup time

16.7

CFG_SEL[1:0] hold time

16.7

1400

Hub recovery/stabilization

500

s

SMBus Code Load

1000

Hub configuration and USB attach

Host acknowledges attach and signals USB reset

100

USB_RESET

host-defined

USB_RESET State

Note 5-4

t10

USB Reset Recovery

Note:

The hub does not propagate the upstream USB reset to downstream devices.

RESET_N

VSS

Hardware

reset asserted

Read

CFG_SEL[1:0]

SMBus code

load

Attach USB

upstream

Attach

Debounce

Interval

USB_RESET

State

Hub PHY

stabilization

valid

CFG_SEL[2:0]

VSS

don’t care

t10

USB Reset

Recovery

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