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FlexRay Communication Controller (FlexRay)
A received frame passes the FIFO filtering if it has passed all three type of filter.
33.6.9.9.1
RX FIFO frame ID value-mask rejection filter
The frame ID value-mask rejection filter is a value-mask filter and is defined by the fields in the
FIFO Frame ID Rejection Filter Value Register (FR_RFFIDRFVR)
Rejection Filter Mask Register
not match the value-mask filter value passes the filter, that is, is not rejected.
Consequently, a received valid frame with the frame ID FID passes the RX FIFO Frame ID Value-Mask
Rejection Filter if
Equation 33-13
FID & FR_RFFIDRFMR FIDRFMSK
The RX FIFO Frame ID Value-Mask Rejection Filter can be configured to pass all frames by the following
settings.
•
FR_RFFIDRFVR[FIDRFVAL] = 0x000 and FR_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.
•
FR_RFFIDRFMR[FIDRFMSK] = 0x000
Using the settings above,
no frame will pass. This is the reset value for the RX FIFO.
33.6.9.9.2
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 (FR_RFRFCFR)
the
Receive FIFO Range Filter Control Register
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, that is, FR_RFRFCTR[FiMD] = 1 and FR_RFRFCTR[FiEN] = 1,
is fulfilled.
FID
FR_RFRFCFR
Consequently, all frames with a frame ID that fulfills
rejection filters will be rejected and thus not pass.
FR_RFRFCFR
1586
(FR_RFFIDRFMR). Each received frame with a frame ID FID that does
is fulfilled.
FR_RFFIDRFVR FIDRFVAL
Equation 33-13
can never be fulfilled (0 != 0) and thus all frames are rejected;
(FR_RFRFCTR). The RX FIFO Frame ID range filters
or FR_RFRFCFR
SID
SEL
IBD
=
0
SID
FID
SEL
IBD
=
0
MPC5644A Microcontroller Reference Manual, Rev. 6
and the
& FR_RFFIDRFMR FIDRFMSK
SID
SEL
IBD
=
1
Equation 33-15
for at least one of the enabled
FR_RFRFCFR
SID
SEL
IBD
Receive
Receive FIFO Frame ID
Eqn. 33-13
and controlled by
Equation 33-14
FID
Eqn. 33-14
Eqn. 33-15
=
1
Freescale Semiconductor
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