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ISP1122ABD 数据表(PDF) 17 Page - NXP Semiconductors

部件名 ISP1122ABD
功能描述  Universal Serial Bus stand-alone hub
PDF  48 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

ISP1122ABD 数据表(HTML) 17 Page - NXP Semiconductors

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Philips Semiconductors
ISP1122A
USB stand-alone hub
Preliminary specification
Rev. 01 — 27 March 2000
17 of 48
9397 750 06986
© Philips Electronics N.V. 2000. All rights reserved.
[1]
ISP1122A 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.
[1]
Unicode encoded string.
Table 14: Hub descriptor
Values in square brackets are optional.
Offset
(bytes)
Field name
Size
(bytes)
Value
(Hex)
Comments
0
bDescLength
1
09
descriptor length=9bytes
1
bDescriptorType
1
29
type = HUB
2
bNbrPorts
1
05 to 02 number of enabled downstream ports;
selectable by DP/DM strapping
3
wHubCharacteristics
2
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]
5
bPwrOn2PwrGood [3]
1
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
6
bHubContrCurrent
1
64
maximum hub controller current
(100 mA)
7
DeviceRemovable
1
00
all devices removable
8
PortPwrCtrlMask
1
FF
must be all ones for compatibility with
USB Specification Rev. 1.0
Table 15: String descriptors
String descriptors are optional and therefore disabled by default; they can be enabled through
an external EEPROM.
Offset
(bytes)
Field name
Size
(bytes)
Value
(Hex)
Comments
String descriptor (0): language ID string
0
bLength
1
04
descriptor length=4bytes
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”



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