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Chapter 13 FlexRay Communication Controller (FLEXRAY)
MC9S12XF - Family Reference Manual, Rev.1.19
Freescale Semiconductor
489
12
FOVB_EF
Receive FIFO Overrun Channel B Error Flag — This ag is set when an overrun of the Receive 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 Receive FIFO overrun on channel B has been detected
11
FOVA_EF
Receive FIFO Overrun Channel A Error Flag — This ag is set when an overrun of the Receive 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 Receive FIFO overrun on channel B has been detected
10
MSB_EF
Message Buffer Search Error Flag — This ag 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
9
MBU_EF
Message Buffer Utilization Error Flag — This ag is asserted if the application writes to a message buffer
control eld that is beyond the number of utilized message buffers programmed in the Message Buffer If the application writes to a MBCCSRn register with n > LAST_MB_UTIL, the FlexRay block ignores the write
0 No such event
1 Non-utilized message buffer enabled
8
LCK_EF
Lock Error Flag — This ag is set if the application tries to lock a message buffer that is already locked by the
FlexRay block due to internal operations. In that case, the FlexRay block does not grant the lock to the
application. The application must issue the lock request again.
0 No such error
1 Lock error detected
7
DBL_EF
Double Transmit Message Buffer Lock Error Flag — This ag is set if the application tries to lock the transmit
side of a double transmit message buffer. In this case, the FlexRay block does not grant the lock to the transmit
side of a double transmit message buffer.
0 No such event
1 Double transmit buffer lock error occurred
6
SBCF_EF
System Bus Communication Failure Error Flag — This ag is set if the FlexRay block was not able to transmit
or receive data via the system bus in time. In the case of writing, data is lost; in the case of reading, the
transmission onto the FlexRay bus is stopped for the current slot and resumed in the next slot.
0 No such event
1 System bus communication failure occurred
5
FID_EF
Frame ID Error Flag — This ag is set if the frame ID stored in the message buffer header area differs from the
frame ID stored in the message buffer control register.
0 No such error occurred
1 Frame ID error occurred
4
DPL_EF
Dynamic Payload Length Error Flag — This ag is set if the payload length written into the message buffer
header eld of a single or double transmit message buffer assigned to the dynamic segment is greater than the
maximum payload length for the dynamic segment as it is congured in the corresponding protocol conguration
0 No such error occurred
1 Dynamic payload length error occurred
Table 13-23. CHIERFR Field Descriptions (Sheet 2 of 3)
Field
Description