PXS20RM Datasheet, PDF (744/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

FlexRay Communication Controller
Table 26-22. FR_CHIERFR field descriptions
Field
Description
FRLB_EF
Frame Lost Channel B Error Flag — This flag is set if a complete frame was received on
channel B but could not be stored in the selected individual message buffer because this
message buffer is currently locked by the application. In this case, the frame and the related slot
status information are lost.
0 No such event
1 Frame lost on channel B detected
FRLA_EF
Frame Lost Channel A Error Flag — This flag is set if a complete frame was received on
channel A but could not be stored in the selected individual message buffer because this
message buffer is currently locked by the application. In this case, the frame and the related slot
status information are lost.
0 No such error
1 Frame lost on channel A detected
PCMI_EF
Protocol Command Ignored Error Flag — This flag is set if the application has issued a POC
command by writing to the POCCMD field in the Protocol Operation Control Register
(FR_POCR) while the BSY flag is equal to 1. In this case the command is ignored by the CC and
is lost.
0 No such error
1 POC command ignored
FOVB_EF
Receive FIFO Overrun Channel B Error Flag — This flag is set when an overrun of the FIFO
for channel B occurred. This error occurs if a semantically valid frame was received on channel
B and matches the all criteria to be appended to the FIFO for channel B but the FIFO is full. In
this case, the received frame and its related slot status information is lost.
0 No such error
1 FIFO overrun on channel B has been detected
FOVA_EF
Receive FIFO Overrun Channel A Error Flag — This flag is set when an overrun of the FIFO
for channel A occurred. This error occurs if a semantically valid frame was received on channel
A and matches the all criteria to be appended to the FIFO for channel A but the FIFO is full. In
this case, the received frame and its related slot status information is lost.
0 No such error
1 FIFO overrun on channel B has been detected
MSB_EF
Message Buffer Search Error Flag — This flag is set if the message buffer search engine is still
running while the next search cycle must be started due to the FlexRay protocol timing. In this
case, not all message buffers are considered while searching.
0 No such event
1 Search engine active while search start appears
MBU_EF
Message Buffer Utilization Error Flag — This flag is asserted if the application writes to a
message buffer control field that is beyond the number of utilized message buffers programmed
in the Message Buffer Segment Size and Utilization Register (FR_MBSSUTR).
If the application writes to a FR_MBCCSRn register with n > LAST_MB_UTIL, the CC ignores
the write attempt and asserts the message buffer utilization error flag MBU_EF in the CHI Error
Flag Register (FR_CHIERFR).
LCK_EF
0 No such event
1 Non-utilized message buffer enabled
Lock Error Flag — This flag is set if the application tries to lock a message buffer that is already
locked by the CC due to internal operations. In that case, the CC does not grant the lock to the
application. The application must issue the lock request again.
0 No such error
1 Lock error detected
26-32
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor