USS-720Instant USB

 

 

 

 

Preliminary Data Sheet, Rev. 5

USB-to-IEEE1284 Bridge

 

 

September 1999

 

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

5-10

Lucent Technologies Inc.

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Lucent Technologies USS-720 manual Bulk Out Endpoint Descriptor, I0A2E1, Bulk In Endpoint Descriptor, I0A2E2