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USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512A 9 Revision 1.96 (07-11-08)
DATASHEET
RBIAS 35 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
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 ports [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 non-removable.
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 Table 3.2, "SMBus or EEPROM
Interface Behavior".
HS_IND/
CFG_SEL1
25
I/O12 Hi-Speed Upstream port indicator & 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 USB2512A Pin Descriptions (continued)
SYMBOL
QFN-36
EMB
BUFFER
TYPE DESCRIPTION