EVB9512 SMSC, EVB9512 Datasheet - Page 60
EVB9512
Manufacturer Part Number
EVB9512
Description
EVALUATION BOARD FOR LAN9512
Manufacturer
SMSC
Specifications of EVB9512
Main Purpose
Interface, Ethernet Controller (PHY and MAC)
Embedded
No
Utilized Ic / Part
LAN9512
Primary Attributes
Single Chip Hi-Speed USB to 10/100 Ethernet
Secondary Attributes
Full Duplex and HP Auto-MDIX Support, 10BASE-T and 100BASE-TX
Other names
638-1093
EVB9512LC
EVB9512LC
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Revision 1.1 (04-26-10)
8.7.2
USB Bus Reset
In response to the upstream port signaling a reset to the hub, the hub does the following:
Note: The hub does not propagate the upstream USB reset to downstream devices.
1. Sets default address to 0.
2. Sets configuration to: Unconfigured.
3. Negates PRTPWR[x:1] to all downstream ports unless battery charging (BC_EN) is enabled.
4. Clears all TT buffers.
5. Moves device from suspended to active (if suspended).
6. Complies with Section 11.10 of the USB 2.0 specification for behavior after completion of the reset
Note: The hub does not propagate the upstream USB reset to downstream devices.
t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load
the configuration is determined by the external SMBus host.
All power supplies must have reached the operating levels mandated in
prior to (or coincident with) the assertion of RESET_N.
sequence. The host then configures the hub and the hub’s downstream port devices in accordance
with the USB specification.
DATASHEET
60
USB 2.0 Hi-Speed Hub Controller
Chapter 9, DC
SMSC USB251x
Parameters,
Datasheet
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