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4-Port USB 2.0 Hub Controller
Datasheet
Revision 1.63 (03-30-07) Page 10 SMSC USB20H04
DATASHEET
Table 4.3 - USB I/O Signals
NAME
BUFFER
TYPE
ACTIVE
LEVEL
DESCRIPTION
USBDP0 IO-U N/A Upstream USB Positive Data Pin.
USBDM0 IO-U N/A Upstream USB Negative Data Pin.
VBUSDET IO8 N/A
Detects state of upstream V
BUS
power. When designing a detachable
hub, this pin must be connected to the V
BUS
power pin of the USB port
that is upstream of the hub.
For self-powered applications with a permanently attached upstream
host, this pin must be connected to either 3.3V or 5.0V (typically
VDD3.3).
The USB20H04 monitors VBUSDET to determine when to assert the
internal D+ pull-up resistor (signaling a connect event). When using the
SRP feature, it is necessary to add a 100k ohm resistor from this pin to
VSS in order to properly dissipate the upstream V
BUS
Pulse (pulsed with
an 8mA drive capability).
USBDP1 IO-U N/A USB Positive Data Pin to downstream port 1.
USBDM1 IO-U N/A USB Negative Data Pin to downstream port 1.
VBUS1_N O8 Low Enables power to downstream port 1.
OCS1_N IPU Low Over-Current Sense input. Internal pull-up resistor to 3.3V.
GR1_N OD8 Low Enables green indicator to downstream port 1.
AM1_N OD8 Low Enables amber indicator to downstream port 1.
USBDP2 IO-U N/A USB Positive Data Pin to downstream port 2.
USBDM2 IO-U N/A USB Negative Data Pin to downstream port 2.
VBUS2_N O8 Low Enables power to downstream port 2.
OCS2_N IPU Low Over-Current Sense input. Internal pull-up resistor to 3.3V.
GR2_N OD8 Low Enables green indicator to downstream port 2.
AM2_N OD8 Low Enables amber indicator to downstream port 2.
USBDP3 IO-U N/A USB Positive Data Pin to downstream port 3.
USBDM3 IO-U N/A USB Negative Data Pin to downstream port 3.
VBUS3_N O8 Low Enables power to downstream port 3.
OCS3_N IPU Low Over-Current Sense input. Internal pull-up resistor to 3.3V.
GR3_N OD8 Low Enables green indicator to downstream port 3.
AM3_N OD8 Low Enables amber indicator to downstream port 3.
USBDP4 IO-U N/A USB Positive Data Pin to downstream port 4.
USBDM4 IO-U N/A USB Negative Data Pin to downstream port 4.
VBUS4_N O8 Low Enables power to downstream port 4.
OCS4_N IPU Low Over-Current Sense input. Internal pull-up resistor to 3.3V.
GR4_N OD8 Low Enables green indicator to downstream port 4.
AM4_N OD8 Low Enables amber indicator to downstream port 4.