FlexRay Module (FLEXRAYV4)
MFR4310 Reference Manual, Rev. 2
Freescale Semiconductor 183
The RX FIFO Frame ID Value-Mask Rejection Filter can be configured to pass all frames by the following
settings:
• RFFIDRFVR.FIDRFVAL:= 0x000
• RFFIDRFMR.FIDRFMSK:= 0x7FF
Using the settings above, only the frame with frame ID 0 is rejected, which is an invalid frame. All other
frames pass.
The RX FIFO Frame ID Value-Mask Rejection Filter can be configured to reject all frames by the
following settings.
• RFFIDRFMR.FIDRFMSK:= 0x000
Using the settings above, Equation 3-10 can never be fulfilled (0!= 0) and thus all frames are rejected; no
frame pass. This is the reset value for the RX FIFO.
3.4.9.5.2 RX FIFO Frame ID Range Rejection Filter
Each of the four RX FIFO Frame ID Range filters can be configured as a rejection filter. The filters are
configured by the Receive FIFO Range Filter Configuration Register (RFRFCFR) and controlled by the
Receive FIFO Range Filter Control Register (RFRFCTR). The RX FIFO Frame ID range filters apply to
all received valid frames. A received frame with the frame ID FID passes the RX FIFO Frame ID Range
rejection filters if no rejection filter is enabled or, for all of the enabled RX FIFO Frame ID Range rejection
filters, i.e. RFRFCTR.FiMD equals 1 and RFRFCTR.FiEN equals 1, Equation 3-11 is fulfilled.
Eqn. 3-11
Consequently, all frames with a frame ID that fulfills Equation 3-12 for at least one of the enabled rejection
filters is rejected and does not pass.
Eqn. 3-12
3.4.9.5.3 RX FIFO Frame ID Range Acceptance filter
Each of the four RX FIFO Frame ID Range filters can be configured as an acceptance filter. The filters are
configured by the Receive FIFO Range Filter Configuration Register (RFRFCFR) and controlled by the
Receive FIFO Range Filter Control Register (RFRFCTR). The RX FIFO Frame ID range filters apply to
all received valid frames. A received frame with the frame ID FID passes the RX FIFO Frame ID Range
acceptance filters if no acceptance filter is enabled or, for at least one of the enabled RX FIFO Frame ID
Range acceptance filters, i.e. RFRFCTR.FiMD equals 0 and RFRFCTR.FiEN equals 1, Equation 3-13 is
fulfilled.
Eqn. 3-13
3.4.9.5.4 RX FIFO Message ID Acceptance Filter
The RX FIFO Message ID Acceptance Filter is a value-mask filter and is defined by the Receive FIFO
Message ID Acceptance Filter Value Register (RFMIDAFVR) and the Receive FIFO Message ID
Acceptance Filter Mask Register (RFMIAFMR). This filter applies only to valid frames received in the
dynamic segment with the payload preamble indicator bit PPI set to 1. All other frames pass this filter.
FID RFRFCFR
SEL
SID
IBD 0=
[]<) or RFRFCFR
SEL
SID
IBD 1=
[]FID<()
RFRFCFR
SEL
SID
IBD 0=
[]FID RFRFCFR
SEL
SID
IBD 1=
[]≤≤
RFRFCFR
SEL
SID
IBD 0=
[]FID RFRFCFR
SEL
SID
IBD 1=
[]≤≤
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