FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
26-132 Freescale Semiconductor
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 26-17 is
fulfilled.
Eqn. 26-17
26.6.9.9.4 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.
A received valid frame in the dynamic segment with the payload preamble indicator bit PPI set to 1 and
with the message ID MID (the first two bytes of the payload) will pass the RX FIFO Message ID
Acceptance Filter if Equation 26-18 is fulfilled.
Eqn. 26-18
The RX FIFO Message ID Acceptance Filter can be configured to accept all frames by setting
• RFMIDAFMR[MIDAFMSK]:= 0x000
Using the settings above, Equation 26-18 is always fulfilled and all frames will pass.
26.6.10 Channel Device Modes
This section describes the two FlexRay channel device modes that are supported by the controller.
26.6.10.1 Dual Channel Device Mode
In the dual channel device mode, both FlexRay ports are connected to physical FlexRay bus lines. The
FlexRay port consisting of FR_A_RX, FR_A_TX, and FR_A_TX_EN is connected to the physical bus
channel A and the FlexRay port consisting of FR_B_RX, FR_B_TX, and FR_B_TX_EN is connected to
the physical bus channel B. The dual channel system is shown in Figure 26-139.
RFRFCFR
SEL
SID
IBD 0=
FID RFRFCFR
SEL
SID
IBD 1=
MID & RFMIDAFMR MIDAFMSKRFMIDAFMR MIDAFVAL & RFMIDAFMR MIDAFMSK=
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