Philips ISP1521 ユーザーズマニュアル
Philips Semiconductors
ISP1521
Hi-Speed USB hub controller
Product data
Rev. 03 — 24 November 2004
27 of 53
9397 750 13702
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
[1]
Value in units of 2 ms.
Table 19:
Interface descriptor
Offset
(bytes)
(bytes)
Field name
Value (hex)
Comments
Full-speed
High-speed
0
bLength
09
09
descriptor length = 9 bytes
1
bDescriptorType
04
04
type = INTERFACE
2
bInterfaceNumber
00
00
-
3
bAlternateSetting
00
00
no alternate setting
4
bNumEndpoints
01
01
status change (interrupt) endpoint
5
bInterfaceClass
09
09
HUB_CLASSCODE
6
bInterfaceSubClass
00
00
HubSubClassCode
7
bInterfaceProtocol
00
00
-
8
bInterface
00
00
no interface string descriptor
Table 20:
Endpoint descriptor
Offset
(bytes)
(bytes)
Field name
Value (hex)
Comments
Full-speed
High-speed
0
bLength
07
07
descriptor length = 7 bytes
1
bDescriptorType
05
05
type = ENDPOINT
2
bEndpointAddress
81
81
endpoint 1 at the address number 1
3
bmAttributes
03
03
interrupt endpoint
4
wMaxPacketSize
01
01
packet size = 1 byte
5
00
00
6
bInterval
FF
0C
polling interval
Table 21:
Hub descriptor
Offset
(bytes)
(bytes)
Field name
Value (hex)
Comments
Full-speed
High-speed
0
bDescLength
09
09
descriptor length = 9 bytes
1
bDescriptorType
29
29
type = HUB
2
bNbrPorts
07
07
number of enabled downstream facing ports; selectable by
DP/DM strapping
DP/DM strapping
06
06
05
05
04
04
03
03
02
02
3
wHubCharacteristics A9
A9
see
4
00
00
5
32
32
ganged or individual mode = 100 ms
00
00
no power switching mode = 0 ms
6
bHubContrCurrent
64
64
-
7
DeviceRemovable
00
00
seven downstream facing ports, no embedded port
8
PortPwrCtrlMask
FF
FF
-