Point Grey Flea3 USB 3.0 Technical Reference 4 Input/Output Control
Offset Name Field Bit Description
Base +
8h
RECEIVE_
BUFFER_
STATUS_
CONTROL
RBUF_ST [0-8]
SIO receive buffer status
Indicates the number of bytes that have arrived at the camera but have
yet to be queued to be read.
Read: Valid data size of current receive buffer
Write: Ignored
RBUF_CNT [8-15]
SIO receive buffer control
Indicates the number of bytes that are ready to be read.
Read: Remaining data size for read
Write: Set input data size
- [16-31] Reserved
Base +
Ch
TRANSMIT_
BUFFER_
STATUS_
CONTROL
TBUF_ST [0-8]
SIO output buffer status
Indicates the minimum number of free bytes available to be filled in
the transmit buffer. It will count down as bytes are written to any of
the SIO_DATA_REGISTERs starting at 2100h. It will count up as bytes
are actually transmitted after a write to TBUF_CNT. Although its
maximum value is 255, the actual amount of available buffer space
may be larger.
Read: Available data space of transmit buffer
Write: Ignored
TBUF_CNT [8-15]
SIO output buffer control
Indicates the number of bytes that have been stored since it was last
written to. Writing any value to TBUF_CNT will cause it to go to 0.
Writing a number less than its value will cause that many bytes to be
transmitted and the rest thrown away. Writing a number greater than
its value will cause that many bytes to be written - its value being valid
and the remainder being padding.
Read: Written data size to buffer
Write: Set output data size for transmit.
- [16-31] Reserved
Base +
100h
SIO_DATA_
REGISTER
Char_0 [0-7]
Character_0
Read: Read character from receive buffer. Padding data if data is not
available.
Write: Write character to transmit buffer. Padding data if data is
invalid.
Char_1 [8-16]
Character_1
Read: Read character from receive buffer+1. Padding data if data is not
available.
Write: Write character to transmit buffer+1. Padding data if data is
invalid.
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
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