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FlexRay Module (FLEXRAYV2)
MFR4300 Data Sheet, Rev. 1
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 and RFFIDRFMR.FIDRFMSK:= 0x7FF
Using the settings above, only the frame with frame ID 0 will be rejected, which is an invalid frame. All
other frames will 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 will 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 either no rejection filter is enabled, or, for all of the enabled RX FIFO Frame ID Range
rejection filters, i.e. RFRFCTR.FiMD = 1 and RFRFCTR.FiEN = 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 will be rejected and thus 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 either no acceptance filter is enabled, or, for at least one of the enabled RX FIFO Frame
ID Range acceptance filters, i.e. RFRFCTR.FiMD = 0 and RFRFCTR.FiEN = 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 will pass this
filter.
FID < RFRFCFRi.SID(0) and RFRFCFRi.SID(1) < FID
RFRFCFRi.SID(0) <= FID <= RFRFCFRi.SID(1)
RFRFCFRi.SID(0) <= FID <= RFRFCFRi.SID(1)