Datasheet – SMSC USB2514 User Manual
Page 12
USB 2.0 High-Speed 4-Port Hub Controller
Datasheet
Revision 1.98 (11-19-07)
12
SMSC USB2514
DATASHEET
RBIAS
35
47
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
22
29
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
), 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
24
31
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
"SMBus or EEPROM Interface Behavior"
HS_IND/
CFG_SEL1
25
32
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 3.1 USB2514 Pin Descriptions (continued)
SYMBOL
36 QFN
48 QFN
BUFFER
TYPE
DESCRIPTION