AT43301-SU Atmel, AT43301-SU Datasheet - Page 9

• Manufacturer Part Number: AT43301-SU
• Description: IC USB HUB CTRLR 4PORT 24SOIC
• Manufacturer: Atmel

Specifications of AT43301-SU

• Controller Type: USB Hub
• Interface: Serial
• Voltage - Supply: 4.4 V ~ 5.25 V
• Current - Supply: 24mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.6
2.6.1
2.6.2
1137J–USB–01/06
Hub Controller
Endpoint 0
Endpoint 1
The Hub Controller of the AT43301 provides the mechanism for the host to enumerate the hub
and the AT43301 to provide the host with its configuration information. It also provides a mecha-
nism for the host to monitor and control the downstream ports.
The Hub Controller supports two endpoints, Endpoint0 and Endpoint1.
The Hub Controller maintains a status register, Controller Status Register, which reflects the
AT43301's current settings. At power up, all bits in this register will be set to 0’s.
Table 2-1.
Endpoint 0 is the AT43301’s default endpoint used for enumeration of the hub and exchange of
configuration information and requests between the host and the AT43301. Endpoint 0 supports
control transfers.
The Hub Controller supports the following descriptors through Endpoint 0: 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.
Endpoint1 is used by the Hub Controller to send status change information to the host. This end-
point supports interrupt transfers.
The Hub Controller samples the changes at the end of every frame at time marker EOF2 in prep-
aration 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.
Bit
0
1
2
3
Function
Hub configuration status
Hub remote wakeup status
Endpoint0 STALL status
Endpoint1 STALL status
Controller Status Register
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
AT43301
9