USB2660 Standard Microsystems Corp., USB2660 Datasheet - Page 36

• Manufacturer Part Number: USB2660
• Description: Ultra Fast Usb 2.0 Hub And Multi-format Flash Media Controller With Dual Sd Interfaces
• Manufacturer: Standard Microsystems Corp.

Revision 1.0 (06-09-09)
8.4.1.14
8.4.1.15
8.4.1.16
8.4.1.17
8.4.1.18
BYTE
BYTE
BYTE
59:2
BIT
BIT
7:0
7:0
0
1
5Eh: USB Product String Descriptor Length
5Fh: USB Product String Descriptor Type
60h-99h: USB Product String Option
9Ah: USB BmAttribute (1 byte)
9Bh: USB MaxPower (1 byte)
USB_MAX_PWR
USB_PRD_STR
USB_PRD_STR
USB_PRD_STR
USB_BM_ATT
NAME
NAME
NAME
NAME
NAME
_LEN
_TYP
Ultra Fast USB 2.0 Hub and Multi-Format Flash Media Controller with Dual SD Interfaces
Self- or Bus-Power: Selects between self- and bus-powered operation.
The hub is either self-powered (draws less than 2 mA of upstream bus
power) or bus-powered (limited to a 100 mA maximum of upstream power
prior to being configured by the host controller).
When configured as a bus-powered device, the SMSC hub consumes less
than 100 mA of current prior to being configured. After configuration, the bus-
powered SMSC hub (along with all associated hub circuitry, any embedded
devices if part of a compound device, and 100 mA per externally available
downstream port) must consume no more than 500 mA of upstream VBUS
current. The current consumption is system dependent, and the OEM must
ensure that the USB 2.0 Specification is not violated.
When configured as a self-powered device, <1 mA of upstream VBUS
current is consumed and all ports are available, with each port being capable
of sourcing 500 mA of current.
80 = Bus-powered operation (default)
C0 = Self-powered operation
A0 = Bus-powered operation with remote wake-up
E0 = Self-powered operation with remote wake-up
USB Max Power per the USB 2.0 Specification. Do NOT set this value
greater than 100 mA.
This string will be used during the USB enumeration process in the
USB product string descriptor length as defined by Section 9.6.7 “String” of
the USB 2.0 Specification (Revision 2.0, 2000). This field is the “bLength”
which describes the size of the string descriptor (in bytes).
USB product string descriptor type as defined by Section 9.6.7 “String” of the
USB 2.0 Specification (Revision 2.0, 2000). This field is the
“bDescriptorType” which is a constant value associated with a string
descriptor type.
Windows
®
operating system. Maximum string length is 28 characters.
DATASHEET
36
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
SMSC USB2660/USB2660i
Datasheet