GeniPS2

UR3HCGNP-001

IC Converts PS/2 Data to USB

Geni and GeniPS2 are trademarks of Semtech
Corporation. All other trademarks belong to their
respective companies.

www.semtech.com

HID & SYSTEM MANAGEMENT PRODUCTS, PROTOCOL INTERPRETER FAMILY

DESCRIPTION

FEATURES

· System Legacy Support

The GeniPS2

UR3HCGNP-001 is

a single IC that converts PS/2
keyboard and mouse data to USB.

The GeniPS2

is ideal for system

legacy support, enabling seamless
connection of standard PS/2
devices (mice or keyboards) to
USB.

The IC offers two hot-pluggable
and hot-swappable PS/2 ports;
either port can accept a mouse
or a keyboard. In addition, the
GeniPS2

auto-detects and

transparently supports mice with
MouseWheel functionality. Internal
and external mouse and keyboard
data are streamed and appear to
the system as if coming from a
single source.

The GeniPS2

supports remote

wake-up function via either mouse
or keyboard, if the BIOS of the host
machine is configured in this
manner.

In addition, the GeniPS2

supports

a multitude of languages, including
Korean and Japanese.

· PS/2 ports are auto-selectable and

hot-swappable the mouse or
keyboard can be used in either
port

· Works with standard Windows 98

keyboard and mouse drivers

· Easy to implement
· Few external components required

· Interfaces PS/2 devices to USB
· Devices are hot-pluggable
· Provides two PS/2 ports
· PS/2 ports support MouseWheel

functionality

Reserved

VSSO

RESET

Reserved

VSS

OSCIN

OSCOUT

VDD

AVDD

LPF

AVSS

PS2D2

Reserved

PS2C2

PS2C1

PS2D1

Reserved

Reserved
Reserved
Reserved
Reserved

SOF

USB_DP

USB_DM

XCVR_CAP

VSS 1

VDD 1

Reserved

Rerserved

Reserved
Reserved
Reserved
Reserved

UR3HCGNP-001-RH

Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved

Reserved

APPLICATIONS

PIN ASSIGNMENTS

USB FUNCTIONALITY

PIN DEFINITIONS

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The GeniPS2

is a full-speed

composite USB device that
interfaces PS/2.

The PS/2 interface supports legacy
Human Input Devices (HID)-class
specification and uses two interrupt
endpoints for the PS/2 devices.

The GeniPS2

handles the merging

of all this data, and sends the data
to the system. Data can come from
either of the two PS/2 ports.
Internal and external mouse and
keyboard data are streamed and
appear to the system as if coming
from a single source.

Mnemonic

QFP

Type

Name and Function

Power Supply
VDD

PWR

Positive supply voltage

VDD1

PWR

Positive supply voltage

AVDD

PWR

Positive analog reference voltage

AVSS

PWR

Ground: analog signal

VSS

PWR

Ground: negative supply voltage

VSS0

PWR

Ground: negative supply voltage

VSS1

PWR

Ground: negative supply voltage

XCVRCAP

PWR

Bypass line

Reset
_RESET

Controller hardware reset pin:
Active-low reset line

Oscillator pins
OSCIN

Oscillator input: input signal from
oscillator

OSCOUT

Oscillator output: output signal to
oscillator

LPF

Loop filter for frequency synthesizer

USB
_SOF

USB _SOF signal

USB_DP

I/O

USB D+ line

USB-DM

I/O

USB D- line

PS/2
PS2D2

I/O

Data line for PS/2 port 2

PS2C2

I/O

Clock line for PS/2 port 2

PS2C1

I/O

Clock line for PS/2 port 1

PS2D1

I/O

Data line for PS/2 port 1

Reserved
Reserved

1-8

N/U

Not used; keep open; reserved for

25-40

future functions

41-69
75-80

PS/2 PORTS

USB DESCRIPTORS

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The two PS/2 ports allow the user
to connect legacy PS/2 devices to
the USB host system. Standard
104-key keyboards and PS/2 mice,
with support for MouseWheel
functionality, can be hot-plugged at
either of the PS/2 ports and
immediately begin communicating
with the host.

Offset

Field

Size

Value

Description

Device Descriptor
0

bLength

Descriptor length (18 bytes)

bDescriptorType

Descriptor type

bcdUSB

0101

USB release

bDeviceClass

Specified in interfaces

bDeviceSubClass

Specified in interfaces

bDeviceProtocol

No protocols on the device basis

bMaxPacketSize0

Maximum packet length (bytes) for
endpoint 0 is 8

idVendor

047A

Vendor ID (USAR)

idProduct

0101

Product ID

bcdDevice

0100

Firmware revision 1.0

iManufacturer

Index for manufacturer string
descriptor

iProduct

Index for product string descriptor

iSerialNumber

Index for serial number string
descriptor

bNumConfigurations

Number of configurations

Configuration Descriptor
0

bLength

Configuration Descriptor length

bDescriptorType

Configuration Descriptor

bTotalLength

003B

Total length of descriptors returned
with this one

bNumInterfaces

Number of interfaces supported

bConfigurationValue

Value associated with this configuration

iConfiguration

Index for configuration string
descriptor none

bmAttributes

Configuration Characteristics
Bit 7: Reserved (set to one) 1
Bit 6: Self-powered 0
Bit 5: Remote wake-up 1

MaxPower

Maximum Power consumed is 100 mA

String Descriptor
0

bLength

Length of language ID

bDescriptorType

Descriptor type (=String)

bString

0904

Array of Language ID code (=English)

bLength

Length of Manufacture String

bDescriptionType

Descriptor Type (=String)

bString

Manufacturer name

bLength

Length of product string

bDescriptorType

Descriptor Type (= String)

bString

Geni PS2 Product Name

Offset

Field

Size

Value

Description

HID Interface Descriptor (Keyboard)
0

bLength

Interface Descriptor length

bDescriptorType

Interface Descriptor

bInterfaceNumber

Index for HID interface

bAlternateSetting

Alternate Setting index

bNumEndpoints

Number of endpoints in this interface.
This includes one interrupt endpoint

bInterfaceClass

USB HID class

bInterfaceSubClass

Keyboard subclass

bInterfaceProtocol

Boot protocol

iInterface

Index for interface string
descriptor none

HID Class Descriptor (Keyboard)
0

bLength

HID Descriptor length

bDescriptorType

HID Descriptor

bcdHID

0101

HID Specification Release (1.01)

bCountryCode

Country Code (not supported)

bNumDescriptors

Number of class descriptors. The one
descriptor is the report descriptor

bDescriptorType

Report Descriptor

wDescriptorLength

0040

Length of Report Descriptor

EndPoint Descriptor (Keyboard)
0

bLength

Endpoint Descriptor Length

bDescriptor type

Endpoint Descriptor

bEndpointAddress

Address:Endpoint3.IN

bmAttributes

Endpoint Attributes: interrupt

wMaxPacketSize

0008

Maximum Packet Size: 8 bytes

bInterval

Polling Interval

USB DESCRIPTORS, (CON'T)

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