AT43312A View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT43312A Datasheet PDF : 28 Pages
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Table 3. Control Status Register
Bit Function
0
Hub configuration status
1
Hub remote wakeup status
2
Endpoint0 STALL status
3
Endpoint1 STALL status
Value
0
1
0
1
0
1
0
1
Description
Set to 0 or 1 by a Set_Configuration Request
Hub is not currently configured
Hub is currently configured
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
Endpoint0 is not stalled
Endpoint0 is stalled
Endpoint1 is not stalled
Endpoint1 is stalled
Endpoint 0
Endpoint 0 is the AT43312A’s default endpoint used for enumeration of the Hub and
exchange of configuration information and requests between the Host and the
AT43312A. Endpoint 0 supports control transfers.
The Hub Controller supports the following descriptors: Device Descriptor, Configuration
Descriptor, Interface Descriptor, Endpoint Descriptor, and Hub Descriptor. These
Descriptors are described in detail elsewhere in this document. Standard USB Device
Requests and class-specific Hub Requests are also supported through Endpoint 0.
There is no endpoint descriptor for Endpoint0.
Endpoint 1
Endpoint1, an interrupt endpoint, is used by the Hub Controller to send status change
information to the Host. The Hub Controller samples the changes at the end of every
frame at time marker EOF2 in preparation for a potential data transfer in the subsequent
frame. The sampled information is stored in a byte wide register, the Status Change
Register, using a bitmap scheme.
Each bit in the Status Change Register corresponds to one port as shown on the follow-
ing page.
Table 4. Status Change Register
Bit Function
0
Hub status change
1
Port1 status change
2
Port2 status change
3
Port3 status change
4
Port4 status change
5-7 Reserved
Value
0
1
0
1
0
1
0
1
0
1
000
Meaning
No change in status
Change in status detected
No change in status
Change in status detected
No change in status
Change in status detected
No change in status
Change in status detected
No change in status
Change in status detected
Default values
10 AT43312A
1255G–USB–05/06
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