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FlexRay Module Registers

Table 26-99. 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 zero 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 detected.

1h Header CRC error detected.

2h Frame CRC error 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 Read returns 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 Read returns 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 detected, channel B idle

1 Activity detected, channel B 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 detected, channel A idle

1 Activity detected, channel A not idle

7-6 Reserved 0 Read returns 0. Writes have no effect.

1277

SPNU563–May 2014 FlexRay Module

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