USB2524 datasheet(12/57 Pages) SMSC

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USB MultiSwitchTM Hub

Datasheet

Revision 1.91 (08-22-07)

SMSC USB2524

DATASHEET

Chapter 4 Switching Hub Pin Descriptions

Table 4.1 Switching Hub Pin Descriptions

NAME

SYMBOL

TYPE

FUNCTION

UPSTREAM USB 2.0 INTERFACE

USB Bus Data

USBUP_DP[2:1]

USBUP_DM[2:1]

IO-U

These pins connect to the upstream USB bus data signals.

Detect Upstream

VBUS Power

VBUS_DET[2:1]

I/O

Detects state of Upstream VBUS power. The SMSC Hub

monitors VBUS_DET to determine when to assert the

internal D+ pull-up resistor (signalling a connect event).

When designing a detachable hub, this pin must be

connected to the VBUS power pin of the USB port that is

upstream of the hub. (Use of a weak pull-down resistor is

recommended.)

For self-powered applications with a permanently attached

host, this pin must be pulled-up to either 3.3V or 5.0V

(typically VDD33).

4-PORT USB 2.0 HUB INTERFACE

High-Speed USB

Data

USBDN_DP[4:1]

USBDN_DM[4:1]

IO-U

These pins connect to the downstream USB peripheral

devices attached to the Hub’s ports.

USB Power

Enable

PRTPWR[4:1]

Enables power to USB peripheral devices (downstream).

The active signal level of the PRTPWR[4] pin is determined

by the Power Polarity Strapping function of the

PRTPWR_POL pin.

Port 4:3 Green

LED

Port Disable

strapping option 0

LED_A[4:3]_N/

PRT_DIS[1:0]

I/O12

Green indicator LED for ports 4 and 3. Will be active low

when LED support is enabled via EEPROM or SMBus. See

PRT_DIS1 function description if the hub is configured by

the internal default configuration.

Port Disable

strapping option 1

PRT_DIS1

I/O12

If the hub is configured by the internal default configuration,

PRT_DIS[1:0] will be sampled at RESET_N negation to

determine if ports [4:2] will be permanently disabled. Also,

the active state of LED_A3_N will be determined as follows:

PRT_DIS[1:0] = '00', All ports are enabled,

LED_A4_N is active high,

LED_A3_N is active high.

PRT_DIS[1:0] = '01', Port 4 is disabled,

LED_A4_N is active high,

LED_A3_N is active low.

PRT_DIS[1:0] = '10', Ports 4 & 3 are disabled,

LED_A4_N is active low,

LED_A3_N is active high.

PRT_DIS[1:0] = '11', Ports 4, 3 & 2 are disabled,

LED_A4_N is active low,

LED_A3_N is active low.

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