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