TC1784
FlexRay™ Protocol Controller (E-Ray)
User´s Manual
20-219
V1.1, 2011-05
E-Ray, V3.13
•
Frame ID + Channel ID
•
Frame ID + Channel ID + Cycle Counter
In order to store a received message in a Message Buffer all configured filters must
match.
Note: For the FIFO the acceptance filter is configured by the FIFO Rejection Filter and
the FIFO Rejection Filter Mask.
A message will be transmitted in the time slot corresponding to the configured Frame ID
on the configured channel(s). If cycle counter filtering is enabled the configured cycle
filter value must also match.
20.6.7.1 Frame ID Filtering
Every transmit and receive buffer contains a Frame ID stored in the Header Section. This
Frame ID is used differently for receive and transmit buffers.
Receive Buffers
A received message is stored in the first receive buffer where the received Frame ID
matches the configured Frame ID, provided channel ID and cycle counter criteria are
also met.
Transmit Buffers
For transmit buffers the configured Frame ID is used to determine the appropriate slot
for message transmission. The Frame will be transmitted in the time slot corresponding
to the configured Frame ID, provided channel ID and cycle counter criteria are also met.
20.6.7.2 Channel ID Filtering
There is a 2-bit channel filtering field (CHA, CHB) located in the Header Section of each
Message Buffer in the Message RAM. It serves as a filter for receive buffers, and as a
control field for transmit buffers (see
Table 20-13 Channel Filtering Configuration
CHA CHB
Transmit Buffer
transmit Frame
Receive Buffer
store valid receive Frame
1
1
on both channels
(static segment only)
received on channel A or B
(store first semantically valid Frame, static segment
only)
1
0
on channel A
received on channel A
0
1
on channel B
received on channel B
0
0
no transmission
ignore Frame
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