XR21B1411_17 Datasheet, PDF (26/32 Pages) Exar Corporation – ENHANCED 1-CH FULL-SPEED USB UART

REV. 1.2.1
OTP_CONFIG3[7:4]: Reserved
XR21B1411
ENHANCED 1-CH FULL-SPEED USB UART
These bits are reserved and should remain ’0’.OTP Valid (Read / Write OTP)
3.2.1.5
OTP _Valid (Read / Write OTP)
This register holds the VALID flag for the OTP override values. These include the USB device and
configuration descriptor overrides and default line coding overrides.
OTP_VALID[0]: USB
 Set this bit to indicate that the USB device and configuration descriptors have selected fields overwritten by
OTP data.
OTP_VALID[1]: Strings
 Set this bit to indicate that the contents of the USB string descriptors are overwritten by OTP data.
OTP_VALID[2]: Line_Coding
 Set this bit to indicate that the power up line coding (baud rate, stop bits, parity) are overwritten by OTP data.
OTP_VALID[7:3]: Reserved
 These bits are reserved and should remain ’0’
3.2.1.6
Line Coding0-6 (Read / Write OTP)
LINE_CODING0-6[7:0]: Value
The contents of this field have the same format as that used in the CDC-ACM SET_LINE_CODING request. It
allows the default baud rate and character format to be overridden.
3.2.1.7
USB_VENDOR_ID_LSB (Read / Write OTP)
USB_VENDOR_ID_LSB[7:0]: Value
Bits [7:0] of the USB vendor ID reported with the descriptors. If OTP_VALID.USB is set to 0, then the Exar
vendor ID is reported instead.
3.2.1.8
USB_VENDOR_ID_MSB (Read / Write OTP)
USB_VENDOR_ID_MSB[7:0]: Value
Bits [15:8] of the USB vendor ID reported with the descriptors. If OTP_VALID.USB is set to 0, then the Exar
vendor ID is reported instead.
3.2.1.9
USB_PRODUCT_ID_LSB (Read / Write OTP)
USB_PRODUCT_ID_LSB[7:0]: Value
Bits [7:0] of the USB product ID reported with the descriptors. If OTP_VALID.USB is set to 0, then the Exar
product ID is reported instead.
3.2.1.10 USB_PRODUCT_ID_MSB (Read / Write OTP)
USB_PRODUCT_ID_MSB[7:0]: Value
Bits [15:8] of the USB product ID reported with the descriptors. If OTP_VALID.USB is set to 0, then the Exar
product ID is reported instead.
3.2.1.11 USB_ATTRIBUTES (Read / Write OTP)
USB_ATTRIBUTES[4:0]: Reserved
 These bits are reserved and should remain ’0’
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