USB20H04 Datasheet, PDF (29/35 Pages) SMSC Corporation – 4-PORT USB 2.0 HUB CONTROLLER

4-Port USB 2.0 Controller
Datasheet
Table 9.3 - Standard Configuration Descriptor
OFFSET
FULL
SPEED
HIGH
SPEED
0
09h
09h
1
02h
02h
2,3 yyyyh yyyyh
4
01h
01h
5
01h
01h
6
00h
00h
user/ user/
7
signal signal
(Bitmap) (Bitmap)
FIELD NAME
bLength
bDescriptorType
wTotalLength
bNumInterfaces
bConfigurationValue
iConfiguration
bmAttibutes
DESCRIPTION
Size of this descriptor in bytes
CONFIGURATION Descriptor Type
Total length of data returned for this
configuration
yyyyh = 0019h if OTG support is disabled.
yyyyh = 001Ch if OTG support is enabled.
Number of interfaces supported by this
configuration
Value to use as an argument to the
SetConfiguration() request to select this
configuration.
Index of string descriptor describing this
configuration (string not supported)
The following values are derived from the OEM
value:
= A0h for Bus-Powered.
= E0h for Self-Powered.
All other values are reserved.
If Dynamic Power support is disabled, this value
is derived from the OEM value for MaxPower
consumed from the bus by the hub in this
configuration.
8
user
(mA)
user
(mA)
bMaxPower
If Dynamic Power support is enabled, the
USB20H04 must be configured for a
bus-powered configuration only, and the
following values are reported for this field:
SELF_PWR = 0, OEM value reported.
SELF_PWR = 1, 02h (small upstream load for
Self-Powered configuration).
Table 9.4 - Other_Speed_Configuration Descriptor
OFFSET
FULL
SPEED
HIGH
SPEED
0
09h
09h
1
07h
07h
2,3 yyyyh* zzzzh
FIELD NAME
bLength
bDescriptorType
wTotalLength
DESCRIPTION
Size of this descriptor in bytes
Other-Speed Configuration Descriptor Type
Total length of data returned for this
configuration
zzzz = 0019h if single TT and OTG disabled.
zzzz = 001Ch if single TT and OTG enabled.
zzzz = 0029h if multi-TT and OTG disabled.
zzzz = 002Fh if multi-TT and OTG enabled.
SMSC USB20H04
Page 29
DATASHEET
Revision 1.63 (03-30-07)