Information

Table 42-110. Message Buffer Code for Tx buffers
CODE Description Tx Code BEFORE tx
frame
MBRTR Tx Code AFTER
successful
transmission
Comment
0b1000: INACTIVE -
MB is not active
INACTIVE - - MB does not
participate in the
arbitration process.
0b1001: ABORT - MB
is aborted
ABORT - - MB does not
participate in the
arbitration process.
0b1100: DATA - MB is
a Tx Data Frame (MB
RTR must be 0)
DATA 0 INACTIVE Transmit data frame
unconditionally once.
After transmission, the
MB automatically
returns to the
INACTIVE state.
0b1100: REMOTE -
MB is a Tx Remote
Request Frame (MB
RTR must be 1)
REMOTE 1 EMPTY Transmit remote
request frame
unconditionally once.
After transmission, the
MB automatically
becomes an Rx Empty
MB with the same ID.
0b1110: TANSWER -
MB is a Tx Response
Frame from an
incoming Remote
Request Frame
TANSWER - RANSWER This is an intermediate
code that is
automatically written to
the MB by the CHI as a
result of match to a
remote request frame.
The remote response
frame will be
transmitted
unconditionally once
and then the code will
automatically return to
RANSWER (0b1010).
The CPU can also
write this code with the
same effect. The
remote response frame
can be either a data
frame or another
remote request frame
depending on the RTR
bit value. Refer to
section “Matching
Process" and section
“Arbitration Process"
for details.
SRR — Substitute Remote Request
Memory Map/Register Definition
K10 Sub-Family Reference Manual, Rev. 6, Nov 2011
1122 Freescale Semiconductor, Inc.