FlexRay Module Registers
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SPNU563A–March 2018
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FlexRay Module
Table 26-107. SUC Configuration Register 1 (SUCC1) Field Descriptions (continued)
Bit Field Value Description
24 MTSA Select channel A for MTS Transmission. The bit selects channel A for MTS symbol
transmission if requested by writing CMD = 8h. The flag is reset by default and may be modified
only in DEFAULT_CONFIG or CONFIG state.
0 Channel A is not selected for MTS transmission.
1 Channel A is selected for MTS transmission.
Note: MTSA may also be changed outside DEFAULT_CONFIG or CONFIG state when the
write to SUC Configuration Register 1 (SUCC1) is directly preceded by the unlock
sequence for the Configuration Lock Key as described in the Lock Register (LCK). This
may be combined with CHI command SEND_MTS. If both bits MTSA and MTSB are set to
1 an MTS symbol will be transmitted on both channels when requested by writing CMD =
8h.
23 HCSE Halt due to clock sync error. Controls reaction of the communication controller to a clock
synchronization error. The bit can be modified in DEFAULT_CONFIG or CONFIG state only.
0 Communication controller will enter or remain in NORMAL_PASSIVE.
1 Communication controller will enter HALT state.
22 TSM Transmission slot mode. Selects the initial transmission slot mode. In SINGLE slot mode the
communication controller may only transmit in the pre-configured key slot. This slot is defined
by the key slot ID, which is configured in the header section of message buffer 0. In all slot
mode the communication controller may transmit in all slots. The bit can be written in
DEFAULT_CONFIG or CONFIG state only. The communication controller changes to all slot
mode when the host successfully applied the ALL_SLOTS command by writing CMD = 5h in
POC states NORMAL_ACTIVE or NORMAL_PASSIVE. The actual slot mode is monitored by
SLM in register CCSV.
0 All slot mode.
1 Single slot mode (default by hardware reset).
21 WUCS Wakeup channel select. With this bit the host selects the channel on which the communication
controller sends the Wakeup pattern. The communication controller ignores any attempt to
change the status of this bit when not in DEFAULT_CONFIG or CONFIG state.
0 Send wakeup pattern on channel A.
1 Send wakeup pattern on channel B.
20-16 PTA 0-1Fh
even/odd
cycle pairs
Passive to active. Defines the number of consecutive even/odd cycle pairs that must have valid
clock correction terms before the communication controller is allowed to transit from
NORMAL_PASSIVE to NORMAL_ACTIVE state. If set to 0, the communication controller is not
allowed to transit from NORMAL_PASSIVE to NORMAL_ACTIVE state. It can be modified in
DEFAULT_CONFIG or CONFIG state only.
15-11 CSA 2h-1Fh Cold start attempts. Configures the maximum number of attempts that a cold starting node is
permitted to try to start up the network without receiving any valid response from another node.
It can be modified in DEFAULT_CONFIG or CONFIG state only. Must be identical in all nodes
of a cluster.
10 Reserved 0 Reads return 0. Writes have no effect.
9 TXSY Transmit sync frame in key slot. Defines whether the key slot is used to transmit a sync frame.
The bit can be modified inDEFAULT_CONFIG or CONFIG state only.
Note: The protocol requires that both bits TXST and TXSY are set for coldstart nodes.
0 No sync frame transmission in key slot, node is neither sync nor coldstart node.
1 Key slot used to transmit sync frame, node is sync node.
8 TXST Transmit startup frame in key slot. Defines whether the key slot is used to transmit a startup
frame. The bit can be modified in DEFAULT_CONFIG or CONFIG state only.
Note: The protocol requires that both bits TXST and TXSY are set for coldstart nodes.
0 No startup frame transmitted in key slot, node is non-coldstarter.
1 Key slot used to transmit startup frame, node is leading or following coldstarter.
7 PBSY POC busy. Signals that the POC is busy and cannot accept a command from the host. CMD is
locked against write accesses.
0 POC is not busy, CMD is writable.
1 POC is busy, CMD is locked.
6-4 Reserved 0 Reads return 0. Writes have no effect.
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