XR21B1421 Datasheet, PDF (27/50 Pages) Exar Corporation – Enhanced 1-Ch Full-Speed

XR21B1421
Field
Lock Value LSB
Offset
2
Size
1
Value
0x8F
OTP programmed fields
Description
Table 7 shows 13 distinct fields within the OTP. Each field may be individually locked by SET_LOCK_BYTE report by writing
a ’0’ in the selected bit position to lock the field. Setting a value of 0x0 will lock all of the OTP fields from any further modifi-
cations.
Table 7: Lock State Bit Positions
Bit
Name
15 Vendor ID String2
14 Vendor ID String1
13 Auto Flush Buffers
12 Release Version
11 Power Mode
10 bMaxPower
9
PID
8
VID
7
Language ID
6:4 Reserved
3
Pin Config
2
Serial String
1
Product ID String2
0
Product ID String1
GET / SET_TRANSFER_MODE
Transfer Type: Control In / Out
Transfer Size: 3 bytes
The GET / SET_TRANSFER_MODE report reports or sets the UART wide mode.
Field
Offset
Report ID
0
TX Wide Enable 1
Size
1
1
Value
0x48
Bit 0 = 0
Bit 0 = 1
Get or set UART wide mode
Disable TX wide mode - default
Enable TX wide mode
Description
© 2014 Exar Corporation
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exar.com/XR21B1421
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