USB2517 datasheet(45/58 Pages) MICROCHIP

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 2013-2016 Microchip Technology Inc.

DS00001598B-page 45

USB2517/USB2517I

7.6.2.3

RESET_N for SMBus Slave Configuration

FIGURE 7-6:

RESET_N TIMING FOR SMBUS MODE

TABLE 7-8:

RESET_N TIMING FOR SMBUS MODE

Name

Description

Min

Typ

Max

Units

RESET_N Asserted.

sec

Hub Recovery/Stabilization.

500

sec

SMBus Code Load (See Note).

250

300

msec

Hub Configuration and USB Attach.

100

msec

Host acknowledges attach and signals USB

Reset.

100

msec

USB Idle.

Undefined

msec

Completion time for requests (with or without data

stage).

msec

Note:

• For Bus-Powered configurations, the 99.5ms (MAX) is required, and the Hub and its associated circuitry must not

consume more than 100mA from the upstream USB power source during t2+t3+t4+t5+t6+t7. For Self-Powered

configurations, t3 MAX is not applicable and the time to load the configuration is determined by the external

SMBus host.

• All Power Supplies must have reached the operating levels mandated in Section 8.0, "DC Parameters", prior to

(or coincident with) the assertion of RESET_N.

RESET_N

VSS

Hardware

reset

asserted

Reset

Negation

SMBus Code

Load

Attach

USB

Upstream

USB Reset

recovery

Idle

Start

completion

request

response

Hub PHY

Stabilization

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