LAN9730 Datasheet, PDF (37/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
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.
TABLE 4-6: INTERFACE DESCRIPTOR 0
Offset
Field
Size
(Bytes)
Default Value
Loaded from
EEPROM
Description
00h bLength
1
01h bDescriptorType
1
02h bInterfaceNumber
1
03h bAlternateSetting
1
04h bNumEndpoints
1
05h bInterfaceClass
1
06h bInterfaceSubClass
1
07h bInterfaceProtocol
1
08h iInterface
1
09h
Note 4-7 Size of descriptor in bytes (9 bytes)
04h
Note 4-7 Interface Descriptor (0x04)
00h
Note 4-7 Number identifying this interface
00h
Note 4-7 Value used to select alternative setting
03h
Note 4-7 Number of Endpoints used for this inter-
face (less Endpoint 0)
FFh
Yes
Class Code
00h
Yes
Subclass Code
FFh
Yes
Protocol Code
00h
Yes
Index of String Descriptor describing
this interface
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.
TABLE 4-7: ENDPOINT 1 DESCRIPTOR
Offset
Field
Size
(Bytes)
00h bLength
1
01h bDescriptorType
1
02h bEndpointAddress
1
03h bmAttributes
1
04h wMaxPacketSize
2
Default Value
07h
05h
81h
02h
Note 4-8
06h bInterval
1
00h
Note 4-8
512 bytes for Hi-Speed mode.
Loaded
from
EEPROM
No
No
No
No
No
No
Description
Size of descriptor in bytes
Endpoint Descriptor
Endpoint Address
Bulk Transfer Type
Maximum packet size this Endpoint is
capable of sending.
Interval for polling Endpoint data trans-
fers. Ignored for bulk Endpoints
 2012-2015 Microchip Technology Inc.
DS00001946A-page 37