USB3803 Datasheet, PDF (51/99 Pages) Microchip Technology – USB 2.0 High-Speed Hub Controller Optimized

USB3803
TABLE 7-7: CONFIGURATION DESCRIPTOR (FULL-SPEED) (CONTINUED)
Offset
5
6
7
8
Field
ConfigurationValue
Configuration
Attributes
MaxPower
Size
1
1
1
1
Value
01H
00h
user/
signal
Description
Value to use as an argument to the SetConfiguration()
request to select this configuration.
Index of string descriptor describing this configuration
(string not supported).
Configuration characteristics: Communicates the capa-
bilities of the hub regarding Remote Wake-up capability,
and also reports the self-power status. In all cases, the
value reported to the host always indicates that the hub
supports Remote Wakeup.
The value reported to the host is dependant upon the
SELF_BUS_PWR bit (CONFIG_BYTE_1)
= A0h for Bus-Powered (SELF_BUS_PWR = 0).
= E0h for Self-Powered (SELF_BUS_PWR = 1).
All other values are reserved.
user Maximum Power Consumption of the Hub from VBUS
when fully operational. This value includes all support
circuitry associated with the hub (including an attached
“embedded” peripheral if hub is part of a compound
device), and is in 2mA increments. The Hub supports
Self-Powered and Bus-Powered operation. The SELF-
_BUS_PWR bit (CONFIG_BYTE_1) are used to deter-
mine which of the values below are reported. The value
reported to the host must coincide with the current oper-
ating mode, and will be determined by the following
rules.
The value that is reported to the host will be:
‘MAX_PWR_BP’ if SELF_BUS_PWR = ‘0’
‘MAX_PWR_SP’ if SELF_BUS_PWR = ‘1’
In all cases the reported value is sourced from the MAX
POWER data field (for Self or Bus power) that was
loaded by Internal Default, or serial port configuration.
7.3.4 INTERFACE DESCRIPTOR (FULL-SPEED)
The following table provides the interface descriptor values for Full-Speed operation.
TABLE 7-8: INTERFACE DESCRIPTOR (FULL-SPEED)
Offset
0
1
2
3
Field
Length
DescriptorType
InterfaceNumber
AlternateSetting
Size
1
1
1
1
Value
09h
04h
00h
00h
Description
Size of this Descriptor
Interface Descriptor Type
Number of this interface.
Value used to select this alternate setting for the inter-
face.
 2014-2015 Microchip Technology Inc.
DS00001691B-page 51