at43312 ATMEL Corporation, at43312 Datasheet - Page 11

• Manufacturer Part Number: at43312
• Description: Self- And Bus- Powered Usb Hub Controller
• Manufacturer: ATMEL Corporation

Endpoint Descriptor
There is no endpoint descriptor for Endpoint0. This descriptor describes the Endpoint1 descriptor which the Hub uses for
status change report.
Hub Descriptor
This descriptor describes the AT43312’s Hub and ports.
Offset
0
1
2
3
4
6
Offset
0
1
2
3
5
6
7
8
Field
bLength
bDescriptorType
bEndpointAddress
bmAttributes
wMaxPacketSize
bInterval
Field
bDescLength
bDescriptor Type
bNbrPorts
wHubCharacteristics
bPwrOn2PwrGood
bHubContrCurrent
DeviceRemovable
PortPwrCtrlMask
Definition
Define size of this descriptor = 9 bytes
Descriptor Type = HUB_DESCRIPTOR = 29
Number of downstream ports = 4
Hub's characteristics:
= Individual power switching
= Hub is not part of a compound device
= Individual Port Over-current Protection
Time from the time power-on sequence begins on a port until power is
good on that port = 100ms.
Maximum current requirements of the hub electronics = 100 mA.
Indicates if a port has removeable device. All downstream ports have
removable devices.
Indicates if a port is not affected by gang-mode power control request. All
the AT43312’s ports require manual SetPortFeature(PORT_POWER)
request to control the port’s power state.
Description
Size of this descriptor = 7 bytes.
Descriptor type = Endpoint
The address of the IN endpoint
Transfer Type = Interrupt
Max. packet size Endpoint1 is capable of sending = 1 byte
Interval for polling endpoint for data transfers = 256 ms
Size (bytes)
Size (bytes)
1
1
1
1
2
1
1
1
1
2
1
1
1
1
Value
0x07
0x05
0x81
0x03
0x01
0x00
0xFF
Value
0x1E
0x09
0x29
0x04
0x09
0x00
0x32
0x64
0x00
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