USB2503 datasheet(12/46 Pages) SMSC

12 / 46 page

USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

Revision 1.92 (05-08-07)

SMSC USB2514

DATASHEET

RBIAS

I-R

USB Transceiver Bias

A 12.0k

Ω (+/- 1%) resistor is attached from ground to

this pin to set the transceiver’s internal bias settings.

SERIAL PORT INTERFACE

SDA/

SMBDATA/

NON_REM1

I/OSD12

Serial Data / SMB Data & Port Non Removable Strap

Option

NON_REM1: Non removable port strap

option.

If this strap is enabled by package and configuration

settings (see Table 3.2), this pin will be sampled (in

conjunction

with LOCAL_PWR/SUSP_IND/NON_REM0) at

RESET_N negation to determine if imports [4:1] contain

permanently attached

(non-removable) devices:

NON_REM[1:0] = ‘00’, All ports are

removable,

NON_REM[1:0] = ‘01’, Port 1 is nonremovable,

NON_REM[1:0] = ‘10’, Ports 1 & 2 are

non-removable,

NON_REM[1:0] = ‘11’, Ports 1, 2 & 3

are non-removable

SCL/

SMBCLK/

CFG_SEL0

I/OSD12

Serial Clock (SCL)

SMBus Clock (SMBCLK)

Configuration Select_SEL0: The logic state of this

multifunction pin is internally latched on the rising edge

of RESET_N (RESET_N negation), and will determine

the hub configuration method as described in Table 3.2,

"SMBus or EEPROM Interface Behavior".

HS_IND/

CFG_SEL1

I/O12

High-Speed Upstream port indictor & Configuration

Programming Select

HS_IND: High Speed Indicator for upstream port

connection speed.

The active state of the LED will be determined as

follows:

CFG_SEL1 = ‘0’,

HS_IND is active high,

CFG_SEL1 = ‘1’,

HS_IND is active low,

‘Asserted’ = Hub is connected at HS

‘Negated’ = Hub is connected at FS

CFG_SEL1: The logic state of this pin is internally

latched on the rising edge of RESET_N (RESET_N

negation), and will determine the hub configuration

method as described in Table 3.2, "SMBus or EEPROM

Interface Behavior".

Table 3.1 USB2514 Pin Descriptions (continued)

SYMBOL

36 QFN

48 QFN

BUFFER

TYPE

DESCRIPTION

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