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Module Operation
1267
SPNU563A–March 2018
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FlexRay Module
6. ECC multi-bit error during data transfer from transient buffer RAM 1,2 to message RAM
a. ECC multi-bit error when reading header section of corresponding message buffer from message
RAM
• MHDS.PMR bit is set
• MHDS.FMBD bit is set to indicate that MHDS.FMB(6-0) points to a faulty message buffer
• MHDS.FMB(6-0) indicates the number of the faulty message buffer
• The data section of the corresponding message buffer is not updated
b. ECC multi-bit error when reading transient buffer RAM 1,2:
• MHDS.PTBF1,2 bit is set
• MHDS.FMBD bit is set to indicate that MHDS.FMB(6-0) points to a faulty message buffer
• MHDS.FMB(6-0) indicates the number of the faulty message buffer
• The data section of the corresponding message buffer is updated
7. ECC multi-bit error during data transfer from message RAM to output buffer RAM
• MHDS.PMR bit is set
• MHDS.FMBD bit is set to indicate that MHDS.FMB(6-0) points to faulty message buffer
• MHDS.FMB(6-0) indicates the number of the faulty message buffer
• Header and/or data section of the output buffer is updated, but should not be used by the host
CPU
8. ECC multi-bit error during host CPU reading output buffer RAM 1,2
• MHDS.POBF bit is set
9. ECC multi-bit error during data read of transient buffer RAM 1,2
When an ECC multi-bit error occurs during the Message Handler reads a frame with network
management information (PPI = 1) from the transient buffer RAM 1,2 the corresponding network
management vector register NMV1,2,3 is not updated from that frame.
Additionally in specific cases of ECC single-bit errors:
1. ECC single-bit error during data transfer from input buffer RAM 1,2 ⇒ message RAM
a. Transfer of header and/or data section and ECC single-bit error occurs during header and/or data
section transfer to message RAM:
• SBESTAT.SIBF bit is set
• SBESTAT.FMBD bit is set to indicate that SBESTAT.FMB(6-0) points to a faulty message
buffer
• SBESTAT.FMB(6-0) indicates the number of the faulty message buffer
• Header and/or data section of the corresponding message buffer is updated
If ECC single-bit error correction is disabled:
– Transmission request for the corresponding message buffer is not set (no transfer to the
FlexRay bus)
b. Transfer of data section only and ECC single-bit error occurs when reading header section of
corresponding message buffer from the message RAM.
• SBESTAT.SMR bit is set
• SBESTAT.FMBD bit is set to indicate that SBESTAT.FMB(6-0) points to a faulty message
buffer
• SBESTAT.FMB(6-0) indicates the number of the faulty message buffer
If ECC single-bit error correction is disabled:
– The data section of the corresponding message buffer is not updated
– Transmission request for the corresponding message buffer is not set (no transfer to the
FlexRay bus)
2. ECC single-bit error during host CPU reading input buffer RAM 1,2
• SBESTAT.SIBF bit is set
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