EVB-USB4640 SMSC, EVB-USB4640 Datasheet - Page 35

• Manufacturer Part Number: EVB-USB4640
• Description: EVALUATION BOARD FOR USB4640
• Manufacturer: SMSC

Specifications of EVB-USB4640

• Main Purpose: Interface, USB 2.0 Hub
• Embedded: *
• Utilized Ic / Part: USB4640
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1107

High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
Datasheet
SMSC USB4640/USB4640i
8.4.1.17
8.4.1.18
BIT
BIT
7:0
7:0
9Ah: USB BmAttribute (1 byte)
9Bh: USB MaxPower (1 byte)
USB_MAX_PWR
USB_BM_ATT
NAME
NAME
Self- or Bus-Power: Selects between self- and bus-powered operation.
The hub is either self-powered (draws less than 2 mA) or bus-powered
(limited to 100 mA maximum 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 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 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.
DATASHEET
35
DESCRIPTION
DESCRIPTION
Revision 1.0 (06-09-09)