Service Manual
20
GR4/PAT_DIS1 I/O Green indicator LED for ports 4 and 3. will be active low when
LED support is enable via EEPROM or SMBus
21
AM3 I/O Amber indicator LED for port 3. signal will be active low.
22
GR3/PRT_DIS0 Green indicator LED for ports 4 and 3. will be active low when
LED support is enable via EEPROM or SMBus
23
PARPWR_POL I/O Port power polarity strapping determination for the active signal
polarity of the [4:1]PRTPWR pins.
24
AM2/MTT_EN I/O Amber indicator LED for port 2. will be active low when LED
support is enable via EEPROM or SMBus
25
GR2/NON_REM1
I/O Green indicator LED for ports 2 and 1. will be active low when
LED support is enable via EEPROM or SMBus.
26
AM1/GANG_EN Amber indicator LED for port 1, Will be active lowwhen LED
support is enabled via EEPROM or SMBus.
27
GR1/NON_REM0
I/O Green indicator LED for ports 2 and 1. will be active low when
LED support is enable via EEPROM or SMBus.
28
VDD33 +3.3V I/O Power
29
VSS Ground
30
VDD18 +1.8V core power
31
TEST0 IPD Used for testing the chip. User must treat as a no-connect or
connect to ground.
32
NC Not connect
33
NC Not connect
34
SDA/SMBDATA IOSD12 Serial data/SMB data signal
35
SCL/SMBCLK IOSD12 Serial clock/SMB clock signal
36
PRTPWR4 O Enables power to USB peripheral devices (downstream)
37
OCS4-N IPU Input from external current monitor indicating an over-current
condition.
38
CFG_SEL0 IOSD12 This multifunction pin is read on the rising edge of RESET_N
negation and will determine the hub configuration.
39
PRTPWR3 O Enables power to USB peripheral devices (downstream)
40
OCS3-N Input from external current monitor indicating an over-current
condition.
41
VSS Ground
42
VDD18 +1.8V core power
43
PRTPWR2 O Enables power to USB peripheral devices (downstream)
44
OCS2-N Input from external current monitor indicating an over-current
condition.
45
PRTPWR1 O Enables power to USB peripheral devices (downstream)
46
OCS1-N Input from external current monitor indicating an over-current
condition.
47
CLKIN_EN I Clock in enable
High=XTAL1 pin configured as CLKIN, and must be driven by
an external CMOS clock.
48
TEST1 IPD Used for testing the chip. User must treat as a no-connect or
connect to ground.
49
RESET_N IS This active low signal is used by the system to reset the chip. The
minimum active low pulse is 1Us.
50
CFG_SEL1 I This pin is read on the rising edge of RESET_N negation and
will determine the hub configuration method.
51
SELF_PWR I Detects availability of local self-power source.
Low=Self/local power source is NOT available.
High= Self/local power source is available.
52
VBUS_DET I/O Detects state of upstream VBUS power. The SMSC Hub
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