XR21B1424_17 Datasheet, PDF (21/64 Pages) Exar Corporation – Enhanced 4-Ch Full-Speed USB UART

XR21B1424
Name
CDC_ACM_IF
SEND_BREAK
XR_GET_CHIP_ID
XR_SET_REG
See Table 5
XR_GET_REG
See Table 5
XR_GET_REVISION
See Table 5
XR_GET_USB_STAT
See Table 5
XR_SET_USB_STAT
See Table 5
Table 4: Supported USB Control Commands
Request
Type
Request
Value
LSB MSB
Index
LSB
MSB
Length
LSB MSB
Description
0x21
0xC0
0x41
0xC1
0xC0
0x23
0xFF
0x0
0x0
0x0
val
val
Chan # 0x0
LSB MSB
0x0
0x0
Send a break for the specified
duration. Channel #0, 2, 4, 6 for
channel A, B, C, D, respec-
tively.
0x0
0x0
0x0
0x0
0x6
0x0
Get MaxLinear VID (2 bytes),
PID (2 bytes) and bcdDevice (2
bytes)
write-
data
LSB
write-
data
MSB
write
addr
Chan # 0x0
0x0
Vendor specific register access.
Channel #0, 2, 4, 6 for channel
A, B, C, D, respectively.
0x0
0x0
read
addr
Chan # 0x2
0x0
Vendor specific register access.
Channel #0, 2, 4, 6 for channel
A, B, C, D, respectively.
0x0
0x0
0x60
0x02
0x2
0x0
Vendor specific register access.
0x40
0x0
0xC0
0x0
write-
data
LSB
0x0
write-
data
MSB
0x0
0x62
0x62
0x02
0x0
0x0
Vendor specific register access.
0x02
0x2
0x0
Vendor specific register access.
21 / 64
exar.com/XR21B1424
Rev 1C