LAN89730 datasheet(37/218 Pages) MICROCHIP

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 2013-2015 Microchip Technology Inc.

DS60001348A-page 37

LAN89730

4.3.1.6.3

Interface Descriptor 0 Default

Table 4-6 shows the default value for Interface Descriptor 0. This descriptor is initialized based on values stored in

EEPROM.

Note 4-7

Value is loaded from EEPROM, but must be equal to the default value in order to comply with the USB

2.0 Specification and provide for normal device operation. Specification of any other value will result

in unwanted behavior and untoward operation.

4.3.1.6.4

Endpoint 1 (Bulk-In) Descriptor

Table 4-7 shows the default value for Endpoint Descriptor 1. This descriptor is not initialized from values stored in

EEPROM.

Note 4-8

512 bytes for Hi-Speed mode.

TABLE 4-6:

INTERFACE DESCRIPTOR 0

Offset

Field

Size

(Bytes)

Default Value

Loaded from

EEPROM

Description

00h

bLength

09h

Note 4-7

Size of descriptor in bytes (9 bytes)

01h

bDescriptorType

04h

Note 4-7

Interface Descriptor (0x04)

02h

bInterfaceNumber

00h

Note 4-7

Number identifying this interface

03h

bAlternateSetting

00h

Note 4-7

Value used to select alternative setting

04h

bNumEndpoints

03h

Note 4-7

Number of Endpoints used for this inter-

face (less Endpoint 0)

05h

bInterfaceClass

FFh

Yes

Class Code

06h

bInterfaceSubClass

00h

Yes

Subclass Code

07h

bInterfaceProtocol

FFh

Yes

Protocol Code

08h

iInterface

00h

Yes

Index of String Descriptor describing

this interface

TABLE 4-7:

ENDPOINT 1 DESCRIPTOR

Offset

Field

Size

(Bytes)

Default Value

Loaded

from

EEPROM

Description

00h

bLength

07h

Size of descriptor in bytes

01h

bDescriptorType

05h

Endpoint Descriptor

02h

bEndpointAddress

81h

Endpoint Address

03h

bmAttributes

02h

Bulk Transfer Type

04h

wMaxPacketSize

Note 4-8

Maximum packet size this Endpoint is

capable of sending.

06h

bInterval

00h

Interval for polling Endpoint data trans-

fers. Ignored for bulk Endpoints

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