Philips ISP1122A Product Data page 16

Philips Semiconductors
9397 750 08958
Product data
Table 11: Configuration descriptor
Values in square brackets are optional.
Offset Field name
(bytes)
0 bLength
1 bDescriptorType
2 wTotalLength
4 bNumInterfaces
5 bConfigurationValue
6 iConfiguration
7 bmAttributes
[2]
8 MaxPower
[1] Selected by input SP/BP.
[2] Value in units of 2 mA.
Table 12: Interface descriptor
Offset Field name
(bytes)
0 bLength
1 bDescriptorType
2 bInterfaceNumber
3 bAlternateSetting
4 bNumEndpoints
5 bInterfaceClass
6 bInterfaceSubClass
7 bInterfaceProtocol
8 bInterface
Table 13: Endpoint descriptor
Offset Field name
(bytes)
0 bLength
1 bDescriptorType
2 bEndpointAddress
3 bmAttributes
4 wMaxPacketSize
6 bInterval
Rev. 03 — 30 October 2001
Size Value Comments
(bytes) (Hex)
1 09 descriptor length = 9 bytes
1 02 type = CONFIGURATION
2 19, 00 total length of configuration, interface
and endpoint descriptors (25 bytes)
1 01 one interface
1 01 configuration value = 1
1 00 no configuration string
1 E0 self-powered with remote wake-up
A0 bus-powered with remote wake-up
1 32 100 mA (default)
[00] 0 mA (using an external EEPROM)
[FA] 500 mA (using an external EEPROM)
Size Value Comments
(bytes) (Hex)
1 09 descriptor length = 9 bytes
1 04 type = INTERFACE
1 00 -
1 01 no alternate setting
1 01 status change (interrupt) endpoint
1 09 HUB_CLASSCODE
1 00 -
1 00 no class-specific protocol
1 00 no interface string
Size Value Comments
(bytes) (Hex)
1 07 descriptor length = 7 bytes
1 05 type = ENDPOINT
1 81 endpoint 1, direction: IN
1 03 interrupt endpoint
2 01, 00 packet size = 1 byte
1 FF polling interval (255 ms)
ISP1122A
USB stand-alone hub
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
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