USB2514I datasheet(47/63 Pages) MICROCHIP

47 / 63 page

USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251xB/xBi

Revision 2.2 (02-17-12)

DATASHEET

5.5.1.3

RESET_N for SMBus Slave Configuration

Figure 5.5 Reset_N Timing for SMBus Mode

Note 5.1

For bus-powered configurations, there is a 99.5 ms MAX, and the hub and its associated

circuitry must not consume more than 100 mA from the upstream USB power source

during t4+t5+t6+t7+t8+t9. For self-powered configurations, t5 MAX is not applicable and

the time to load the configuration is determined by the external SMBus host.

Note 5.2

All power supplies must have reached the operating levels mandated in Chapter 6: DC

Parameters

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

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted

μs

CFG_SEL[1:0] setup time

16.7

CFG_SEL[1:0] hold time

16.7

1400

Hub recovery/stabilization

500

μs

t5BUS

SMBus code load (Note 5.1)99.5

t5SELF

SMBus Code Load (Note 5.1)

undefined

Hub configuration and USB attach

100

Host acknowledges attach and signals USB reset

100

USB idle

undefined

Completion time for requests (with or without data

stage)

5ms

RESET_N

VSS

Hardware

reset asserted

Read

CFG_SEL[1:0]

SMBus code

load

Attach USB

upstream

USB reset

recovery

Idle

Start completion

request response

Hub PHY

stabilization

valid

CFG_SEL[2:0]

VSS

don’t care

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