USB2512 datasheet(56/72 Pages) SMSC

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USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 1.0 (3-11-09)

SMSC USB251x

DATASHEET

8.6.1.1

RESET_N for Strapping Option Configuration

Figure 8.3 Reset_N Timing for Default/Strap Option Mode

Notes:

When in bus-powered mode, the hub and its associated circuitry must not consume more than 100

mA from the upstream USB power source during t1+t5.

All power supplies must have reached the operating levels mandated in Chapter 9, DC Parameters,

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

Table 8.7 Reset_N Timing for Default/Strap Option Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

Strap Setup Time

16.7

nsec

Strap Hold Time.

16.7

1400

nsec

hub outputs driven to inactive logic states

1.5

μsec

USB Attach (See Note).

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

Valid

Driven by Hub if strap is an output.

RESET_N

VSS

Strap Pins

VSS

Hardware

reset

asserted

Read Strap

Options

Drive Strap

Outputs to

inactive

levels

Attach

USB

Upstream

USB Reset

recovery

Idle

Start

completion

request

response

Don’t Care

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