June, 2009

V0.20P

-4-

F71610A

6. Function Description

6.1 USB function

The F71610A communications with host by full-speed USB interface (12Mb/s). It supports 3

suits endpoint, one control endpoint( endpoint zero) is for bus enumeration, one output endpoint is

for Microsoft Windows Vista / 7 IR Receiver Emulation Device command and one input endpoint is

transmit IR information to host.

Endpoint zero is special significance in USB system. It is a control endpoint, and is required by

every device. Only control endpoint accept special setup token that the host transfer command to

device.

During enumeration, host requests GET_DESCRIPTOR to device and device return

information (over in endpoint zero) as what device driver top load. The below table is about F71610A

descriptor.

offset

Field

size

Value

0

BLength

1

0x12

1

bDescriptor Type

1

0x01

2

BcdUSB

2

0x0200

4

bDeviceClass

1

0x00

5

bDeviceSubClass

1

0x00

6

bDeviceProtocol

1

0x00

7

bMaxPacketSize

1

0x10

8

IdVendor

2

0x1934

10

IdProduct

2

0x5168

12

BcdDevice

2

0x0000

14

Manufacturer

1

0x01

15

IProduct

1

0x02

16

iSerialNumber

1

0x03

17

bNumConfiguration

1

0x01

Table 6-1 Device Descriptor

offset

Field

size

Value

0

BLength

1

0x09

1

bDescriptor Type

1

0x02

2

wTotalLength

2

0x0020

4

bNumInterface

1

0x01

5

bConfigurationValue

1

0x01

6

iConfiguration

1

0x00

7

BmAttributes

1

0xa0

8

MaxPower

1

0x32

Table 6-2 Configuration Descriptor