USB2524 datasheet(24/57 Pages) SMSC

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USB MultiSwitchTM Hub

Datasheet

Revision 1.91 (08-22-07)

SMSC USB2524

DATASHEET

7.1.4.8

7.1.4.9

BIT

NUMBER

BIT NAME

DESCRIPTION

DYNAMIC

Dynamic Power Enable: Controls the ability of the Hub to automatically

change from Self-Powered operation to Bus- Powered operation if the local

power source is removed or is unavailable (and from Bus-Powered to Self-

Powered if the local power source is restored). {Note: If the local power source

is available, the Hub will always switch to Self-Powered operation.}

When Dynamic Power switching is enabled, the Hub detects the availability of

a local power source by monitoring the external SELF_PWR pin. If the Hub

detects a change in power source availability, the Hub immediately

disconnects and removes power from all downstream devices and disconnects

the upstream port. The Hub will then re-attach to the upstream port as either

a Bus-Powered Hub (if local-power in unavailable) or a Self-Powered Hub (if

local power is available).

0 = No Dynamic auto-switching.

1 = Dynamic Auto-switching capable.

Reserved

Reserved, always = ‘0’.

5:4

OC_TIMER

OverCurrent Timer: Over Current Timer delay.

00 = 0.1ms

01 = 2ms

10 = 4ms

11 = 6ms

COMPOUND

Compound Device: Allows the OEM to indicate that the Hub is part of a

compound (see the USB Specification for definition) device. The applicable

port(s) must also be defined as having a “Non-Removable Device”.

Note: When configured via strapping options, declaring a port as non-

removable automatically causes the hub controller to report that it is part of a

compound device.

0 = No.

1 = Yes, Hub is part of a compound device.

2:1

Reserved

Reserved, always = ‘0’.

BOOST_IOUT

Upstream USB electrical signaling drive strength Boost Bit.

Note:

This is used for long-trace length designs where additional electrical

signal boost may be required to support standard USB signal levels

at the far end of a cable.

‘0’ = Normal electrical drive strength.

‘1’ = Elevated electrical drive strength.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:6

PRT_ASSIGN_MODE Port Assignment Interface Mode:

‘00’ = Port Assign Interface is configured for Programmable Mode (8

configurations) (3-wire)

‘01’ = Port Assign Interface is configured for Direct Port Control. (4-Wire), Level

Sensitive.

‘10’ = Port Assign Interface is configured for Direct Port Control. (4-Wire), edge

Sensitive, and Unassigned state is not supported.

‘11’ = Port Assign Interface is configured for Direct Port Control. (4-Wire), edge

Sensitive, and the Unassigned state is supported.

USB2524 Datasheet(PDF) 24 Page - SMSC Corporation

USB2524 Datasheet(HTML) 24 Page - SMSC Corporation

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