LAN9500 Datasheet, PDF (34/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
TABLE 5-9: ENDPOINT 3 DESCRIPTOR (CONTINUED)
Offset
Field
Size
(Bytes)
Default
Value
Loaded
from
EEPROM
Description
04h wMaxPacketSize
2
10h
No
Maximum Packet Size this endpoint is
capable of sending.
06h bInterval
1
Note 5-11
Yes
Interval for polling endpoint data
transfers.
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.
TABLE 5-10: OTHER SPEED CONFIGURATION DESCRIPTOR
Offset
Field
Size
(Bytes)
Default
Value
Loaded
from
EEPROM
Description
00h bLength
01h bDescriptorType
02h wTotalLength
04h bNumInterfaces
05h bConfigurationValue
06h iConfiguration
07h bmAttributes
08h bMaxPower
1
09h
Note 5-12 Size of Descriptor in bytes (9 bytes)
1
07h
Note 5-12 Other Speed Configuration Descriptor
(0x07)
2
0027h Note 5-12 Total length in bytes of data returned
(39 bytes)
1
01h
Note 5-12 Number of Interfaces
1
01h
Note 5-12 Value to use as an argument to select
this configuration
1
00h
Yes
Index of String Descriptor describing
this configuration
1
A0h
Yes Bus powered and remote wakeup
enabled.
1
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 5-12
Note 5-13
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.
Default value is 01h in Self Powered mode and FAh in Bus Powered mode.
Note: The PWR_SEL and RMT_WKP straps affect the default value of bmAttributes.
DS00001875A-page 34
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