Interface 0, alternate setting 2 (i0:a2), Table 11 . interface descriptor, i0:a2, Table 12 . bulk out endpoint descriptor, i0:a2:e1 – Lucent Technologies USS-720 User Manual

Page 36: Table 13 . bulk in endpoint descriptor, i0:a2:e2, Table 14 . interrupt endpoint descriptor, i0:a2:e3, Usb port, Instant usb, Ieee

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5-10

Lucent Technologies Inc.

USS-720

Instant USB

Preliminary Data Sheet, Rev. 5

USB-to-

IEEE

1284 Bridge

September 1999

13

USB Port

(continued)

Interface 0, Alternate Setting 2 (I0:A2)

Table 11. Interface Descriptor, I0:A2

Offset

Field

Size

Value

Description

0

bLength

Byte

0x09

Size of this descriptor in bytes.

1

bDescriptorType

Byte

0x04

Interface descriptor type.

2

bInterfaceNumber

Byte

0x00

Zero-based value identifying the number of this interface.

3

bAlternateSetting

Byte

0x02

Value used to select this alternate interface.

4

bNumEndpoints

Byte

0x03

Number of endpoints used by this descriptor.

5

bInterfaceClass

Byte

0xFF

Vendor specific.

6

iInterfaceSubClass

Byte

0x00

7

bInterfaceProtocol

Byte

0xFF

Vendor specific.

8

iInterface

Byte

0x00

Index to string describing this interface.

Table 12. Bulk Out Endpoint Descriptor, I0:A2:E1

Offset

Field

Size

Value

Description

0

bLength

Byte

0x07

Size of this descriptor in bytes.

1

bDescriptorType

Byte

0x05

Endpoint descriptor type.

2

bEndpointAddress

Byte

0x01

This is an Out endpoint, endpoint number 1.

3

bmAttributes

Byte

0x02

This is a Bulk endpoint.

4

wMaxPacketSize

Word 0x0040 Maximum data transfer size.

6

bInterval

Byte

0x00

Does not apply to Bulk endpoints.

Table 13. Bulk In Endpoint Descriptor, I0:A2:E2

Offset

Field

Size

Value

Description

0

bLength

Byte

0x07

Size of this descriptor in bytes.

1

bDescriptorType

Byte

0x05

Endpoint descriptor type.

2

bEndpointAddress

Byte

0x82

This is an In endpoint, endpoint number 2.

3

bmAttributes

Byte

0x02

This is a Bulk endpoint.

4

wMaxPacketSize

Word 0x0040 Maximum data transfer size.

6

bInterval

Byte

0x00

Does not apply to Bulk endpoints.

Table 14. Interrupt Endpoint Descriptor, I0:A2:E3

Offset

Field

Size

Value

Description

0

bLength

Byte

0x07

Size of this descriptor in bytes.

1

bDescriptorType

Byte

0x05

Endpoint descriptor type.

2

bEndpointAddress

Byte

0x83

This is an In endpoint, endpoint number 3.

3

bmAttributes

Byte

0x03

This is an Interrupt endpoint.

4

wMaxPacketSize

Word 0x0004 Maximum data transfer size.

6

bInterval

Byte

0x01

This pipe should be serviced every frame.

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