Datasheet – SMSC USB2512 User Manual
Page 9
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Revision 1.92 (11-28-07)
9
SMSC USB2512
DATASHEET
SERIAL PORT INTERFACE
SDA/
SMBDATA/
NON_REM1
22
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 [2:1] 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 are non-removable.
SCL/
SMBCLK/
CFG_SEL0
24
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
.
HS_IND/
CFG_SEL1
25
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"
MISC
XTAL1/
CLKIN
33
ICLKx
Crystal Input/External Clock Input
24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or to an
external 24MHz clock when a crystal is not used.
Table 3.1 USB2512 Pin Descriptions (continued)
SYMBOL
QFN-36
EMB
BUFFER
TYPE
DESCRIPTION