ISP1521BEUM ST-Ericsson Inc, ISP1521BEUM Datasheet - Page 23

• Manufacturer Part Number: ISP1521BEUM
• Description: IC USB HUB CONTROLLER HS 80-LQFP
• Manufacturer: ST-Ericsson Inc

Specifications of ISP1521BEUM

• Controller Type: USB Hub
• Interface: I²C
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: 568-1884-2; ISP1521BE,518; ISP1521BE-T

9. Hub controller description
CD00222695
Product data sheet
9.1 Endpoint 0
9.2 Endpoint 1
Each USB device is composed of several independent logic endpoints. An endpoint acts
as a terminus of communication flow between the host and the device. At design time,
each endpoint is assigned a unique number (endpoint identifier; see
combination of the device address (given by the host during enumeration), the endpoint
number, and the transfer direction allows each endpoint to be uniquely referenced.
The ISP1521 has two endpoints: endpoint 0 (control) and endpoint 1 (interrupt).
Table 13.
[1]
According to the USB specification, all devices must implement a default control endpoint.
This endpoint is used by the host to configure the USB device. It provides access to the
device configuration and allows generic USB status and control access.
The ISP1521 supports the following descriptor information through its control endpoint 0:
The maximum packet size of this endpoint is 64 bytes.
Endpoint 1 can be accessed only after the hub has been configured by the host (by
sending the Set Configuration command). It is used by the ISP1521 to send the status
change information to the host.
Endpoint 1 is an interrupt endpoint. The host polls this endpoint once every 255 ms. After
the hub is configured, an IN token is sent by the host to request the port change status. If
the hub detects no change in the port status, it returns a NAK to this request, otherwise
the Status Change byte is sent.
Function
Hub ports 0 to 7
•
•
•
•
•
•
•
IN: input for the USB host; OUT: output from the USB host.
Device descriptor
Device_qualifier descriptor
Configuration descriptor
Interface descriptor
Endpoint descriptor
Hub descriptor
Other_speed_configuration descriptor
Hub endpoints
Endpoint
identifier
0
1
Rev. 07 — 4 February 2010
Table 14
Transfer type
control
interrupt
shows the content of the change byte.
Direction
OUT
IN
IN
Hi-Speed USB hub controller
[1]
© ST-ERICSSON 2010. All rights reserved.
Table
Maximum packet
size (bytes)
64
64
1
ISP1521
13). The
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