XR21B1420 Datasheet, PDF (47/60 Pages) Exar Corporation – Enhanced 1-Ch Full-Speed USB UART

XR21B1420
LOCK_BYTE_1 (0x01C) - Read/Write OTP
Each bit field in the LOCK_BYTE_1 register must be set by the user to indicate the corresponding field has been pro-
grammed. Any field that has been programmed can not be programmed again.
CAUTION: Do not set the PROG bit for any field that has not had the entire data field entered, otherwise, the empty field or
any portion thereof will be programmed (all ’0’s) into the OTP.
For definitions of the individual fields, refer to the corresponding register definition in “XR21B1420 Register Map” on page
21.
Bit
7
6
5
4
3
2
1
0
Default
Description
0
VEND_STRING2
0: Corresponding field has not been programmed. Values will not be read from OTP.
1: Corresponding field has been programmed. Values will be read from OTP.
0
VEND_STRING1
0: Corresponding field has not been programmed. Values will not be read from OTP.
1: Corresponding field has been programmed. Values will be read from OTP.
0
FLUSH
0: Corresponding field has not been programmed. Values will not be read from OTP.
1: Corresponding field has been programmed. Values will be read from OTP.
0
RELEASE
0: Corresponding field has not been programmed. Values will not be read from OTP.
1: Corresponding field has been programmed. Values will be read from OTP.
0
USB_ATTRIBUTES
0: Corresponding field has not been programmed. Values will not be read from OTP.
1: Corresponding field has been programmed. Values will be read from OTP.
0
MAX_POWER
0: Corresponding field has not been programmed. Values will not be read from OTP.
1: Corresponding field has been programmed. Values will be read from OTP.
0
PID
0: Corresponding field has not been programmed. Values will not be read from OTP.
1: Corresponding field has been programmed. Values will be read from OTP.
0
VID
0: Corresponding field has not been programmed. Values will not be read from OTP.
1: Corresponding field has been programmed. Values will be read from OTP.
PIN_CFG_USB_STAT1 (0x01F) - Read/Write OTP
Controls the configuration of the USB_STAT1 pin during suspend state
Bit
7:5
Default
Description
0
Reserved
These bits are reserved and should be written as ‘0’.
© 2014 Exar Corporation
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