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USB 2.0 High-Speed 4-Port Hub Controller
Datasheet
Revision 1.98 (11-19-07) 10 SMSC USB2514
DATASHEET
LED_A[4:1]_N/
PRT_SWP[4:1]
n/a 13
23
25
37
I/O12 Port LED Indicators & Port Swap strapping option
Indicator LED for ports 1-4. Will be active low when LED
support is enabled via EEPROM or SMBus.
If this strap is enabled by package and configuration
settings (see Table 3.2), this pin will be sampled at
RESET_N negation to determine the electrical
connection polarity of the downstream USB Port pins
(USB_DP and USB_DM).
Also, the active state of the LED will be determined as
follows:
‘0’ = Port Polarity is normal, and the LED is active high.
‘1’ = Port Polarity (for USB_DP and USB_DM) is
swapped, and the LED is active low.
LED_B4_N n/a 12 I/O12 Enhanced Port 4 LED
Enhanced Indicator LED for port 4. Will be active low
when LED support is enabled via EEPROM or SMBus.
LED_B3_N/
GANG_EN
n/a 22 I/O12 Enhanced Port 3 LED & Gang Power and Overcurrent
Strap Option
Enhanced Indicator LED for port 3. Will be active low
when LED support is enabled via EEPROM or SMBus.
GANG_EN: Selects between Gang or Individual Port
power and Over Current sensing.
If this strap is enabled by package and configuration
settings (see Table 3.2), this pin will be sampled at
RESET_N negation to determine the mode as follows:
‘0’ = Individual sensing & switching, and LED_B3_N is
active high.
‘1’ = Ganged sensing & switching, and LED_B3_N is
active low.
LED_B[2:1]_N/
BOOST[1:0]
n/a 24
36
I/O12 Enhanced Port [2:1] LED & Phy Boost strapping option
Enhanced Indicator LED for ports 1 & 2. Will be active
low when LED support is enabled via EEPROM or
SMBus.
Table 3.1 USB2514 Pin Descriptions (continued)
SYMBOL 36 QFN 48 QFN
BUFFER
TYPE DESCRIPTION