XR21B1411IL-0A-EB Datasheet, PDF (26/30 Pages) Exar Corporation – ENHANCED 1-CH FULL-SPEED USB UART

XR21B1411
ENHANCED 1-CH FULL-SPEED USB UART
REV. 1.2.0
USB_ATTRIBUTES[5]: REMOTE_WAKEUP
 Bit[5] of the bmAttributes field of the device descriptor. If OTP_VALID.USB is set to 1, then this bit is set to
indicate that the device supports remote wakeup.
USB_ATTRIBUTES[6]: SELF_POWERED
Bit[6] of the bmAttributes field of the device descriptor. If OTP_VALID.USB is set to 1, then this bit is set to
indicate that the device is self powered. If the device also requires bus power to be reserved, then that power
requirement is given by the USB_MAXPOWER field.
USB_ATTRIBUTES[7]: Reserved
This bit is reserved and should remain ’0’
3.2.1.12 USB_MAXPOWER (Read / Write OTP)
USB_MAXPOWER[7:0]: Value
The bMaxPower field of the device descriptor. It is expressed in units of 2 mA. If OTP_VALID.USB is set to 1,
then this indicates the power requirement of the device.
3.2.1.13 MANUFACTURER STRING 0-15 (Read / Write OTP)
MANUFACTURER_STRING_0-15[7:0]: Value
The default manufacturer string. Null-terminated ASCII.
3.2.1.14 PRODUCT STRING 0-15 (Read / Write OTP)
PRODUCT_STRING_0-15[7:0]: Value
The default product string. Null-terminated ASCII.
3.2.1.15 SERIAL NUMBER STRING 0-15 (Read / Write OTP)
SERIAL_NUMBER_STRING_0-15[7:0]: Value
The default serial number string. Null-terminated ASCII.
3.2.1.16 ADDRESS VALUE (Read / Write OTP)
ADDRESS_VALUE[7:0]: Value
The Address Value feature can be used to further customize the power-up defaults for the XR21B1411 before
a software driver begins to initialize the device. For example, the manufacturer, product and serial number
strings can be customized using the address value feature. However, if improperly used, this feature may
cause permanent functional damage in the device.
Send an e-mail to [e-mail] for information regarding customizing register default values that
can not be initialized in the Exar I/O Lab web configuration tool.
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