USB2504_06 datasheet(11/46 Pages) SMSC

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Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

SMSC USB2504/USB2504A

Revision 2.1 (12-06-06)

DATASHEET

4-PORT USB 2.0 HUB INTERFACE

High-Speed USB

Data

USBDN[4:1]

USBDP[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]

O12

Enables power to USB peripheral devices (downstream).

The active signal level of the PRTPWR[4:1] pins is

determined by the Power Polarity Strapping function of the

PRTPWR_POL pin.

Port 4:3 Green

LED

Port Disable

strapping option.

GR[4:3]/

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.

If the hub is configured by the internal default configuration,

these pins will be sampled at RESET_N negation to

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

the active state of the LED’s will be determined as follows:

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

GR4 is active high,

GR3 is active high.

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

GR4 is active high,

GR3 is active low.

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

GR4 is active low,

GR3 is active high.

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

GR4 is active low,

GR3 is active low.

Port [2:1] Green

LED

Port Non-

Removable

strapping option.

GR[2:1]/

NON_REM[1:0]

I/O12

Green indicator LED for ports 2 and 1. Will be active low

when LED support is enabled via EEPROM or SMBus.

If the hub is configured by the internal default configuration,

these pins will be sampled at RESET_N negation to

determine if ports [3:1] contain permanently attached (non-

removable) devices. Also, the active state of the LED’s will

be determined as follows:

NON_REM[1:0] = ‘00’, All ports are removable,

GR2 is active high,

GR1 is active high.

NON_REM[1:0] = ‘01’, Port 1 is non-removable,

GR2 is active high,

GR1 is active low.

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,

GR2 is active low,

GR1 is active high.

NON_REM[1:0] = ‘11’, Ports 1, 2, & 3 are non-removable,

GR2 is active low,

GR1 is active low.

Table 4.1 4-Port Hub Pin Descriptions (continued)

NAME

SYMBOL

TYPE

FUNCTION

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