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Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 12 of 48
9397 750 07002
© Philips Electronics N.V. 2000. All rights reserved.
9. Host requests
The ISP1122 handles all standard USB requests from the host via control endpoint 0.
The control endpoint can handle a maximum of 64 bytes per transfer.
Remark: Please note that the USB data transmission order is Least Significant Bit
(LSB) first. In the following tables multi-byte variables are displayed least significant
byte first.
9.1 Standard requests
Table 7 shows the supported standard USB requests. Some requests are explicitly
unsupported. All other requests will be responded with a STALL packet.
Table 6: Status Change byte: bit allocation
Bit Symbol Description
0 Hub SC a logic 1 indicates a status change on the hub’s upstream port
1 Port 1 SC a logic 1 indicates a status change on downstream port 1
2 Port 2 SC a logic 1 indicates a status change on downstream port 2
3 Port 3 SC a logic 1 indicates a status change on downstream port 3
4 Port 4 SC a logic 1 indicates a status change on downstream port 4
5 Port 5 SC a logic 1 indicates a status change on downstream port 5
6 reserved not used
7 reserved not used
Table 7: Standard USB requests
Request name bmRequestType
byte 0 [7:0]
(Bin)
bRequest
byte 1
(Hex)
wValue
byte 2, 3
(Hex)
wIndex
byte 4, 5
(Hex)
wLength
byte 6, 7
(Hex)
Data
Address
Set Address X000 0000 05 address
[1]
00, 00 00, 00 none
Configuration
Get Configuration 1000 0000 08 00, 00 00, 00 01, 00 configuration
value = 01H
Set Configuration (0) X000 0000 09 00, 00 00, 00 00, 00 none
Set Configuration (1) X000 0000 09 01, 00 00, 00 00, 00 none
Descriptor
Get Configuration
Descriptor
1000 0000 06 00, 02 00, 00 length
[2]
configuration,
interface and
endpoint
descriptors
Get Device Descriptor 1000 0000 06 00, 01 00, 00 length
[2]
device
descriptor
Get String Descriptor (0) 1000 0000 06 03, 00 00, 00 length
[2]
language ID
string
Get String Descriptor (1) 1000 0000 06 03, 01 00, 00 length
[2]
manufacturer
string
Get String Descriptor (2) 1000 0000 06 03, 02 00, 00 length
[2]
product string