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FlexRay Module Registers
1389
SPNU563A–March 2018
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FlexRay Module
26.3.2.5.2 FIFO Rejection Filter (FRF)
The FIFO rejection filter defines a user specified sequence of bits with which channel, frame ID, and cycle
count of the incoming frames are compared. Together with the FIFO rejection filter mask (FRFM), this
register determines whether a message is rejected by the FIFO. The FRF register can be written during
DEFAULT_CONFIG or CONFIG state only.
Figure 26-159 and Table 26-139 illustrate this register.
Figure 26-159. FIFO Rejection Filter Register (FRF) [offset_CC = 304h]
31 25 24 23 22 16
Reserved RNF* RSS* CYF*
R-0 R-1h R-1h R/W-0
15 13 12 2 1 0
Reserved FID* CH*
R-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset; *These bits can be updated in DEFAULT_CONFIG or CONFIG state
only
Table 26-139. FIFO Rejection Filter Register (FRF) Field Descriptions
Bit Field Value Description
31-25 Reserved 0 Reads return 0. Writes have no effect.
24 RNF Reject null frames. If this bit is set, received null frames are not stored in the FIFO.
0 Null frames are stored in the FIFO.
1 Reject all null frames.
23 RSS Reject in static segment. If this bit is set, the FIFO is used only for the dynamic segment.
0 FIFO also used in static segment.
1 Reject messages in static segment.
22-16 CYF Cycle counter filter. The 7-bit cycle counter filter determines the cycle set to which the frame ID
FIFO rejection filter and the channel FIFO rejection filter are applied. In cycles not belonging to the
cycle set specified by CYF, all frames are rejected. For details about the configuration of the cycle
counter filter.
15-13 Reserved 0 Reads return 0. Writes have no effect.
12-2 FID 0-7FFh Frame ID filter. A frame ID filter value of 0 means that no frame ID is rejected.
1-0 CH Channel filter.
Note: If reception on both channels is configured, also in the static segment both frames (from
channel A and B) are always stored in the FIFO, even if they are identical.
0 Receive on both channels.
1h Receive only on channel B.
2h Receive only on channel A.
3h No reception.
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