XR21B1421 Datasheet, PDF (19/50 Pages) Exar Corporation – Enhanced 1-Ch Full-Speed

XR21B1421
USB Control Commands
The following table shows all of the USB Control Commands that are supported by the XR21B1421. Commands include
standard USB commands, CDC-ACM commands and custom Exar commands.
Table 3: Supported USB Control Commands
Name
DEV GET_STATUS
Request
Type
Request
0x80
0
IF GET_STATUS
EP GET_STATUS
0x81
0
0x82
0
DEV CLEAR_FEATURE
0x00
1
EP CLEAR_FEATURE
0x02
1
DEV SET_FEATURE
0x00
3
DEV SET_FEATURE
0x00
3
EP SET_FEATURE
0x02
3
SET_ADDRESS
GET_DESCRIPTOR
0x00
5
0x80
6
GET_DESCRIPTOR
0x80
6
GET_DESCRIPTOR
0x80
6
GET_CONFIGURATION
0x80
8
SET_CONFIGURATION
0x00
9
GET_INTERFACE
0x81
10
Value
LSB
0
MSB
0
Index
LSB
0
MSB
0
0
0
1
0
1
2
0
addr
0
0
0
0
0
0x0,0x4,
0
0x84
0
0
0
0
0x0,0x4,
0
0x84
0
0
0
0
0
test
0
0x0,0x4,
0
0x84
0
0
0
1
0
0
0
2
LangID LangID
0
3
0
0
0
0
0
0
n
0
0
0
0
0
0
0
Length
LSB
2
MSB
0
2
0
2
0
Description
Device: remote wake-up + self-
powered
Interface: zero
Endpoint: halted
0
0
Device remote wake-up
0
0
Endpoint halt
0
0
Device remote wake-up
0
0
Test mode - factory use only
0
0
Endpoint halt
0
len
MSB
len
MSB
len
MSB
1
0
1
0
len
MSB
len
MSB
len
MSB
0
0
0
addr = 1 to 127
Device descriptor
Configuration descriptor
String descriptor
n = 0, 1
© 2014 Exar Corporation
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exar.com/XR21B1421
Rev 1B