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FlexRay Module Registers
1335
SPNU563A–March 2018
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FlexRay Module
Table 26-93. Test Register 1 (TEST1) Field Descriptions (continued)
Bit Field Value Description
27-24 CERA Coding Error Report Channel A.
Set when a coding error is detected on channel A. Reset to 0 when register TEST1 is read or
written. Once the CERA is set it will remain unchanged until the Host accesses the TEST1 register
0 No coding error is detected.
1h Header CRC error is detected.
2h Frame CRC error is detected.
3h Frame Start Sequence FSS too long.
4h First bit of Byte Start Sequence BSS seen LOW.
5h Second bit of Byte Start Sequence BSS seen HIGH.
6h First bit of Frame End Sequence FES seen HIGH.
7h Second bit of Frame End Sequence FES seen LOW.
8h CAS / MTS symbol seen too short.
9h CAS / MTS symbol seen too long.
Ah-Fh Reserved
Note: Coding errors are also signaled when the communication controller is in
MONITOR_MODE. The error codes regarding CAS / MTS symbols concern only the
monitored bit pattern, irrelevant whether those bit patterns occurred in the symbol window
or elsewhere.
23-22 Reserved 0 Reads return 0. Writes have no effect.
21 TXENB Control of channel B transmit enable pin.
0 txen2 pin drives a 0.
1 txen2 pin drives a 1.
20 TXENA Control of channel A transmit enable pin.
0 txen1 pin drives a 0.
1 txen1 pin drives a 1.
19 TXB Control of channel B transmit pin.
0 txd2 pin drives a 0.
1 txd2 pin drives a 1.
18 TXA Control of channel A transmit pin.
0 txd1 pin drives a 0.
1 txd1 pin drives a 1.
17 RXB Monitor channel B receive pin.
0 rxd2 = 0
1 rxd2 = 1
16 RXA Monitor channel A receive pin.
0 rxd1 = 0
1 rxd1 = 1
15-10 Reserved 0 Reads return 0. Writes have no effect.
9 AOB Activity on B. The channel idle condition is specified in the FlexRay protocol spec v2.1, BITSTRB
process.
0 No activity is detected, channel B is idle.
1 Activity is detected, channel B is not idle.
8 AOA Activity on A. The channel idle condition is specified in the FlexRay protocol spec v2.1, BITSTRB
process.
0 No activity is detected, channel A is idle.
1 Activity is detected, channel A is not idle.
7-6 Reserved 0 Reads return 0. Writes have no effect.
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