AT43312 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT43312 Datasheet PDF : 21 Pages
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Figure 3. Bus-Powered Hub Power Supply
BUS_POWER
GND
3V REG
IN
OUT
GND
VCC5 GND VCC3
R1
VREF AT43312
R2 Y
PWR
MOSFET P
OVC DM DP
DP
DM
PORT_POWER
GND
To
downstream
device
Hub Controller
The Hub Controller of the AT43312 provides the mecha-
nism for the Host to enumerate the Hub, and the AT43312
to provide the Host with its configuration information. It also
provides a mechanism for the Host to monitor and control
the downstream ports. Power is applied, on a per port
basis, by the Hub Controller upon receiving a command,
Set_Port_Feature[PORT_POWER], from the Host. The
Control Status Register
AT43312 itself must be configured first by the Host before
the Hub Controller can apply power to external devices.
The Hub Controller contains two endpoints, Endpoint0 and
Endpoint1, and maintains a status register, Controller Sta-
tus Register, which reflects the AT43312’s current settings.
At power up, all bits in this register will be set to 0’s.
Bit Function
Value Description
0 Hub configuration status
Set to 0 or 1 by a Set_Configuration Request
0 Hub is not currently configured
1 Hub is currently configured
1 Hub remote wakeup status
Set to 0 or 1 by ClearFeature or SetFeature request. Default value is 0.
0 Hub is currently not enabled to request remote wakeup
1 Hub is currently enabled to request remote wakeup
2 Endpoint0 STALL status
0 Endpoint0 is not stalled
1 Endpoint0 is stalled
3 Endpoint1 STALL status
0 Endpoint1 is not stalled
1 Endpoint1 is stalled
6
AT43312
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