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Section 20 Controller Area Network
Page 1002 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Please note that for Mailbox 30 TTW is fixed to '01', Offset to '00' and rep_factor to ‘0’.The
following tables report the combinations for the rep_factor and the offset.
Rep_factor Description
3'b000 Every basic cycle (initial value)
3'b001 Every two basic cycle
3'b010 Every four basic cycle
3'b011 Every eight basic cycle
3'b100 Every sixteen basic cycle
3'b101 Every thirty two basic cycle
3'b110 Every sixty four basic cycle (once in system matrix)
3'b111 Reserved
The Offset Field determines the first cycle in which a Time Triggered Mailbox may start
transmitting its Message.
Offset Description
6'b000000 Initial Offset = 1
st
Basic Cycle (initial value)
6'b000001 Initial Offset = 2
nd
Basic Cycles
6'b000010 Initial Offset = 3
rd
Basic Cycles
6'b000011 Initial Offset = 4
th
Basic Cycles
6'b000100 Initial Offset = 5
th
Basic Cycles
6'b111110 Initial Offset = 63
rd
Basic Cycles
6'b111111 Initial Offset = 64
th
Basic Cycles
The following relation must be maintained:
Cycle_Count_Maximum + 1 >= Repeat_Factor > Offset
Cycle_Count_Maximum = 2
CMAX
- 1
Repeat_Factor = 2
rep_factor