USB20H04 datasheet(13/38 Pages) SMSC

13 / 38 page

4-Port USB2.0 Controller

Datasheet

SMSC USB20H04

Page 13

Revision 1.63 (10-14-04)

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 VBUS power. When designing a detachable

hub, this pin must be connected to the VBUS 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 VBUS 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

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

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

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

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.

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