LAN9730 datasheet(36/222 Pages) MICROCHIP

36 / 222 page

LAN9730/LAN9730i

DS00001946A-page 36

 2012-2015 Microchip Technology Inc.

Note 4-2

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.

Note 4-3

Default value is dependent on device release. The MSB matches the device release and the LSB is

hardcoded to 00h. The initial release value is 01h.

4.3.1.6.2

Configuration Descriptor

The Configuration Descriptor is initialized based on values stored in EEPROM. Table 4-5 shows the default Configura-

tion Descriptor values.

Note 4-4

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.

Note 4-5

The descriptor type for Configuration Descriptors specified in EEPROM is a “don’t care” and is always

overwritten by hardware as 0x02.

Note 4-6

Default value is 01h in Self-Powered mode and FAh in Bus Powered mode.

TABLE 4-5:

CONFIGURATION DESCRIPTOR

Offset

Field

Size

(Bytes)

Default Value

Loaded from

EEPROM

Description

00h

bLength

09h

Note 4-4

Size of the Configuration Descriptor in

bytes (9 bytes)

01h

bDescriptorType

02h

Note 4-5

Configuration Descriptor (0x02)

02h

wTotalLength

0027h

Note 4-4

Total length in bytes of data returned

(39 bytes)

04h

bNumInterfaces

01h

Note 4-4

Number of interfaces

05h

bConfigurationValue

01h

Note 4-4

Value to use as an argument to select

this configuration

06h

iConfiguration

00h

Yes

Index of String Descriptor describing

this configuration

07h

bmAttributes

A0h

Yes

Bus powered and remote wakeup

enabled.

08h

bMaxPower

Note 4-6

Yes

Maximum power consumption is

500 mA.

Note:

The RMT_WKP strap affects the default value of bmAttributes.

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