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User’s Manual
BOSCH
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Revision 1.6TTCAN
11.11.02
manual_about.fm
In the Trigger Memory, the Triggers must be sorted according to their Time_Marks. There may
not be two Triggers that are active at the same Cycle Time and Cycle_Count. For details see
chapter 5.1.3.
Type Trigger Type
0
Tx_Ref_Trigger valid when not in Gap
1
Tx_Ref_Trigger_Gap valid when in Gap
2
Tx_Trigger_Single Start a transmission
3
Tx_Trigger_Merged Start a Merged Arbitrating Window
4
Watch_Trigger valid when not in Gap
5
Watch_Trigger_Gap valid when in Gap
6
Rx_Trigger Check for reception
7
EndOfList illegal type, causes config-error
Message Number
0x00
Trigger is valid for Message 32
0x01-0x1F
Trigger is valid for Message 1 to Message 31
Cycle_Code Cycle_Count for which the Trigger is valid
0b000000x valid for all Cycles
0b000001c valid every second Cycle at (Cycle_Count mod 2) = c
0b00001cc valid every fourth Cycle at (Cycle_Count mod 4) = cc
0b0001ccc valid every eighth Cycle at (Cycle_Count mod 8) = ccc
0b001cccc valid every sixteenth Cycle at (Cycle_Count mod 16) = cccc
0b01ccccc valid every thirty-second Cycle at (Cycle_Count mod 32) = ccccc
0b1cccccc valid every sixty-fourth Cycle at (Cycle_Count mod 64) = cccccc
Time_Mark
0x0000-0xFFFF
Cycle Time for which the trigger becomes active.
Note :
The Message Number must be “1” for Type Tx_Ref_Trigger and Tx_Ref_Trigger_Gap. The
Message Number is not regarded for Type Watch_Trigger, Watch_Trigger_Gap, and EndOf-
List. The Time_Mark is not regarded for Trigger Type EndOfList. The Cycle_Count is only
regarded for Type Rx_Trigger, Tx_Trigger_Single, and Tx_Trigger_Merged.
3.5.3 TT Operation Mode Register (addresses 0x29 & 0x28)
Init_Ref_Offset Initial Reference Trigger Offset
0x00-0x7F
positive offset (Initial offset may not be negative).
TM Time Master
one
The node is a (potential) Time Master.
zero
The node will never be a Time Master.
MPr2-0 Time Master Priority (last three bits of Reference Message’s identifier)
0x0-0x7 The priority of this node (0 is highest priority).
L2 Level 2
one
The node operates in TTCAN Level 2.
zero
The node operates in TTCAN Level 1.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
res Init_Ref_Offset TM MPR2-0 L2 EECS
TTMode
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