ISP1130DL Philips Semiconductors, ISP1130DL Datasheet - Page 11

• Manufacturer Part Number: ISP1130DL
• Description: Universal Serial Bus compound hub with integrated keyboard controller
• Manufacturer: Philips Semiconductors

7. Endpoint descriptions
Philips Semiconductors
9397 750 06895
Objective specification
7.1 Endpoint configuration
Each USB device is logically composed of several independent endpoints. An
endpoint acts as a terminus of a communication flow between the host and the
device. At design time each endpoint is assigned a unique number (endpoint
identifier, see
during enumeration), the endpoint number and the transfer direction allows each
endpoint to be uniquely referenced.
The ISP1130 hub has 1 to 2 downstream ports and 1 to 3 embedded functions. The
upstream and downstream ports are fully handled by hardware and require no
firmware intervention. Downstream port 2 can be disabled by connecting both D and
D to V
The number of embedded functions can be configured from 1 to 3 via the USBCONA
register. These embedded functions give access to the keyboard controller and other
optional software functions. The functions are assigned as follows:
Each embedded function has two endpoint types: endpoint 0 (control) and endpoint 1
(generic: bulk and/or interrupt). The embedded function endpoints can handle a
maximum of 8 bytes per transfer.
Table 3:
Function
Hub
Embedded
Function 1
Embedded
Function 2
•
•
•
Embedded function 1: standard keyboard
Embedded function 2:
Embedded function 3: user-defined functions.
– multimedia functions (e.g. volume control)
– ACPI system control
– application launch keys
CC
Endpoint allocation
.
Ports
0: upstream
1, 2
downstream
3 (or 2
4 (or 3
Table
[4]
:
Rev. 01 — 23 March 2000
[5]
[5]
3). The combination of the device address (given by the host
)
)
Endpoint
identifier
0
1
0
1
0
1
USB compound hub with keyboard controller
Transfer
type
control
interrupt
control
generic
control
generic
[3]
[3]
Endpoint
index
-
-
-
0
1
2
3
4
5
6
7
[2]
[2]
[2]
Direction
OUT
IN
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
© Philips Electronics N.V. 2000. All rights reserved.
ISP1130
[1]
Max. packet
size (bytes)
64
64
1
8
8
8
8
8
8
8
8
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