LAN9500AI datasheet(34/213 Pages) MICROCHIP

34 / 213 page

LAN950x

DS00001875A-page 34

 2010 - 2015 Microchip Technology Inc.

Note 5-11

This value is loaded from the EEPROM. A Full-Speed and Hi-Speed polling interval exists. If no

EEPROM exists than this value defaults to 04h for HS and 01h for FS.

5.3.1.6.7

Other Speed Configuration Descriptor

The fields in this descriptor are derived from Configuration Descriptor information that is stored in the EEPROM.

Note 5-12

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 5-13

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

04h

wMaxPacketSize

10h

Maximum Packet Size this endpoint is

capable of sending.

06h

bInterval

Note 5-11

Yes

Interval for polling endpoint data

transfers.

TABLE 5-10:

OTHER SPEED CONFIGURATION DESCRIPTOR

Offset

Field

Size

(Bytes)

Default

Value

Loaded

from

EEPROM

Description

00h

bLength

09h

Note 5-12

Size of Descriptor in bytes (9 bytes)

01h

bDescriptorType

07h

Note 5-12

Other Speed Configuration Descriptor

(0x07)

02h

wTotalLength

0027h

Note 5-12

Total length in bytes of data returned

(39 bytes)

04h

bNumInterfaces

01h

Note 5-12

Number of Interfaces

05h

bConfigurationValue

01h

Note 5-12

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 5-13

Yes

Maximum Power Consumption is 500

mA.

Note:

EEPROM values are obtained for the Configuration Descriptor at the other USB speed. I.e., if the current

operating speed is FS, then the HS Configuration Descriptor values are used, and vice-versa.

Note:

The PWR_SEL and RMT_WKP straps affect the default value of bmAttributes.

TABLE 5-9:

ENDPOINT 3 DESCRIPTOR (CONTINUED)

Offset

Field

Size

(Bytes)

Default

Value

Loaded

from

EEPROM

Description

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