XR21B1421 Datasheet, PDF (24/50 Pages) Exar Corporation – Enhanced 1-Ch Full-Speed

SET_CLEAR_FIFOS
Transfer Type: Control Out
Transfer Size: 2 bytes
The SET_CLEAR_FIFOS report clears the selected FIFO buffers.
Field
Report ID
Clear
Offset
0
1
Size
1
1
Value
0x43
Value
Description
Clear FIFO buffers
Clears FIFOs
Bit 0 - ’1’ clears TX FIFO (self-clearing)
Bit 1 - ’1’ clears RX FIFO (self-clearing)
XR21B1421
GET_GPIO_STATE
Transfer Type: Control In
Transfer Size: 3 bytes
The GET_GPIO_STATE report gets the actual state of the GPIO or flow control pins configured as either inputs or outputs.
Field
Report ID
State MSB
State LSB
Offset
0
1
2
Size
1
1
1
Value
0x44
Get status of GPIO pins
See Table 5
Description
© 2014 Exar Corporation
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exar.com/XR21B1421
Rev 1B