isp1122 NXP Semiconductors, isp1122 Datasheet - Page 17

• Manufacturer Part Number: isp1122
• Description: Isp1122 Universal Serial Bus Stand-alone Hub
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 07002
Product specification
Table 14: Hub descriptor
Values in square brackets are optional.
[1]
[2]
[3]
Table 15: String descriptors
String descriptors are optional and therefore disabled by default; they can be enabled through
an external EEPROM.
[1]
6
7
8
Offset
(bytes)
0
1
2
3
5
Offset
(bytes)
String descriptor (0): language ID string
0
1
2
String descriptor (1): manufacturer string
0
1
2
String descriptor (2): product string
0
1
2
ISP1122 always reports power management status on an individual basis, even for ganged/global
modes. This is compliant with USB Specification Rev. 1.1 .
Condition with no overcurrent detection is reported to the host.
Value in units of 2 ms.
Unicode encoded string.
Field name
bDescLength
bDescriptorType
bNbrPorts
wHubCharacteristics
bPwrOn2PwrGood
bHubContrCurrent
DeviceRemovable
PortPwrCtrlMask
Field name
bLength
bDescriptorType
bString
bLength
bDescriptorType
bString
bLength
bDescriptorType
bString
Rev. 03 — 29 March 2000
[3]
Size
(bytes)
1
1
1
2
1
1
1
1
Size
(bytes)
1
1
2
1
1
44
1
1
14
Value
(Hex)
09
29
05 to 02 number of enabled downstream ports;
09, 00
11, 00
32
00
[FA]
64
00
FF
Value
(Hex)
04
03
09, 04
2E
03
UC
10
03
UC
[1]
[1]
Comments
descriptor length = 9 bytes
type = HUB
selectable by DP/DM strapping
individual power switching
overcurrent protection active
(modes 0, 1, 3, 4, 5, 7)
individual power switching
overcurrent protection (modes 2, 6)
100 ms (default; modes 0, 1, 2, 4, 5, 6)
0 ms (default; modes 3, 7)
500 ms (using an external EEPROM;
modes 0, 1, 2, 4, 5, 6); see
maximum hub controller current
(100 mA)
all devices removable
must be all ones for compatibility with
USB Specification Rev. 1.0
Comments
descriptor length = 4 bytes
type = STRING
LANGID code zero
descriptor length = 46 bytes
type = STRING
“Philips Semiconductors”
descriptor length = 16 bytes
type = STRING
“ISP1122”
USB stand-alone hub
© Philips Electronics N.V. 2000. All rights reserved.
ISP1122
[1]
[1]
Table 23
,
, no
17 of 48
[2]