USB 2.0 Hub and 10/100 Ethernet Controller
Datasheet
Table 2.3 Miscellaneous Pins (continued)
NUM
PINS
BUFFER
TYPE
NAME
SYMBOL
DESCRIPTION
Test 1
TEST1
-
Used for factory testing, this pin must always be left
unconnected.
1
1
1
Test 2
Test 3
TEST2
TEST3
-
-
Used for factory testing, this pin must always be
connected to VSS for proper operation.
Used for factory testing, this pin must always be
connected to VDD33IO for proper operation.
24 MHz Clock
Enable
CLK24_EN
CLK24_OUT
TEST4
IS
08
-
This pin enables the generation of the 24 MHz
clock on the CLK_24_OUT pin.
1
1
24 MHz Clock
This pin outputs a 24 MHz clock that can be used
a reference clock for a partner hub.
Test 4
Used for factory testing, this pin must always be left
unconnected.
1
Table 2.4 USB Pins
NUM
PINS
BUFFER
TYPE
NAME
SYMBOL
DESCRIPTION
Upstream
USBDM0
AIO
AIO
Upstream USB DMINUS signal.
Upstream USB DPLUS signal.
1
1
USB DMINUS 0
Upstream
USB
DPLUS 0
USBDP0
Downstream
USBDM2
USBDP2
USBDM3
USBDP3
PRTCTL2
AIO
AIO
AIO
AIO
Downstream USB peripheral 2 DMINUS signal.
Downstream USB peripheral 2 DPLUS signal.
Downstream USB peripheral 3 DMINUS signal.
Downstream USB peripheral 3 DPLUS signal.
1
1
1
1
USB DMINUS 2
Downstream
USB DPLUS 2
Downstream
USB DMINUS 3
Downstream
USB DPLUS 3
USB Port Power
Control 2
IS/OD12 When used as an output, this pin enables power to
(PU)
downstream USB peripheral 2.
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 2. An overcurrent
condition is indicated when the signal is low.
1
Refer to Section 2.1 for additional information.
Revision 1.0 (11-24-09)
SMSC LAN9512/LAN9512i
DATA1S2HEET
SMSC [ SMSC CORPORATION ]
