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AT43312 Datasheet(PDF) 6 Page - ATMEL Corporation

Part No. AT43312
Description  Self- and Bus- Powered USB Hub Controller
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT43312 Datasheet(HTML) 6 Page - ATMEL Corporation

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AT43312
6
Figure 3. Bus-Powered Hub Power Supply
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
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.
R1
Y
3V REG
IN
OUT
GND
BUS_POWER
GND
MOSFET P
DP
DM
PORT_POWER
GND
To
downstream
device
VCC5
GND
VCC3
PWR
OVC
DM
DP
VREF
AT43312
R2
Control Status Register
Bit
Function
Value
Description
0
Hub configuration status
0
1
Set to 0 or 1 by a Set_Configuration Request
Hub is not currently configured
Hub is currently configured
1
Hub remote wakeup status
0
1
Set to 0 or 1 by ClearFeature or SetFeature request. Default value is 0.
Hub is currently not enabled to request remote wakeup
Hub is currently enabled to request remote wakeup
2
Endpoint0 STALL status
0
1
Endpoint0 is not stalled
Endpoint0 is stalled
3
Endpoint1 STALL status
0
1
Endpoint1 is not stalled
Endpoint1 is stalled


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