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TC1784
FlexRay™ Protocol Controller (E-Ray)
User´s Manual
20-239
V1.1, 2011-05
E-Ray, V3.13
Worst case for one IBF
⇒
MBF or MBF
⇒
OBF:
Worst case for multiple transfers
If a second IBF
⇒
MBF and a MBF
⇒
OBF (see Figure 20-20) is requested directly after
the first IBF
⇒
MBF has started following worst case timing could appear:
20.6.11.3 Minimum
f
CLC_ERAY
To calculate the minimum
f
CLC_ERAY
the worst case scenario has to be considered.
The worst case scenario depends on the following parameters
•
maximum payload length
•
minimum minislot length
•
number of configured Message Buffers (excluding FIFO)
•
used channels (single/dual channel)
Figure 20-23 worst case scenario
Max. break time: tbf_to_mbf_break time
max
= (2+68) + (4+1) = 75
Max. number of
f
CLC_ERAY
cycles: cycles
req
= 3
×
(6 + 68 + 75) = 435
cycles
trans
=
(remaining cycles of transfer running)
+ (cycles of second requested transfer)
+ (cycles of third requested transfer)
cycles
trans
=
cycles
rem
+ cycles
req_2
+ cycles
req_3
Max. number of
f
CLC_ERAY
cycles: cycles
trans
=
447 + 435 + 447 = 1329
slot counter
n (receive)
TBF
⇒
MBF
find sequence
SS
⇒
MBF
n+1
n+2
n+3
n+4
n+5
n+6
n+7
n+8
Содержание TC1784
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