ISP1130 Просмотр технического описания (PDF) - Philips Electronics
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ISP1130 Datasheet PDF : 68 Pages
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Philips Semiconductors
ISP1130
USB compound hub with keyboard controller
7. Endpoint descriptions
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 Table 3). The 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.
7.1 Endpoint configuration
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 VCC.
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:
• Embedded function 1: standard keyboard
• Embedded function 2:
– multimedia functions (e.g. volume control)
– ACPI system control
– application launch keys
• Embedded function 3: user-defined functions.
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: Endpoint allocation
Function Ports
Endpoint
identifier
0: upstream 0
Hub
1, 2 [4]:
downstream 1
Embedded 3 (or 2 [5]) 0
Function 1
1
Embedded 4 (or 3 [5]) 0
Function 2
1
Transfer
type
control
interrupt
control
generic [3]
control
generic [3]
Endpoint
index
- [2]
- [2]
- [2]
0
1
2
3
4
5
6
7
Direction [1] Max. packet
size (bytes)
OUT
64
IN
64
IN
1
OUT
8
IN
8
OUT
8
IN
8
OUT
8
IN
8
OUT
8
IN
8
9397 750 06895
Objective specification
Rev. 01 — 23 March 2000
© Philips Electronics N.V. 2000. All rights reserved.
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