NXP Semiconductors PXN2020 - 26.5.2.70 Message Buffer Frame ID Registers (MBFIDRn); 26.5.2.71 Message Buffer Index Registers (MBIDXRn)

FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
26-76 Freescale Semiconductor
NOTE
If at least one message buffer assigned to a certain slot is assigned to both
channels, then all message buffers assigned to this slot have to be assigned
to both channels. Otherwise, the message buffer configuration is illegal and
the result of the message buffer search is not defined.
26.5.2.70 Message Buffer Frame ID Registers (MBFIDRn)
26.5.2.71 Message Buffer Index Registers (MBIDXRn)
Base + 0x0104 (MBFIDR0)
Base + 0x010C (MBFIDR1)
...
Base + 0x04FC (MBFIDR127)
Write: POC:config or MB_DIS
0123456789101112131415
R00000
FID
W
Reset00000-----------
Figure 26-101. Message Buffer Frame ID Registers (MBFIDRn)
Table 26-82. MBFIDRn Field Descriptions
Field Description
FID Frame ID — The semantic of this field depends on the message buffer transfer type.
• Receive Message Buffer: This field is used as a filter value to determine if the message buffer is used for
reception of a message received in a slot with the slot ID equal to FID.
• Transmit Message Buffer: This field is used to determine the slot in which the message in this message buffer
should be transmitted.
Base + 0x0106 (MBIDXR0)
Base + 0x010E (MBIDXR1)
...
Base + 0x04FE (MBIDXR127)
Write: POC:config or MB_DIS
0123456789101112131415
R00000000
MBIDX
W
Reset00000000- -------
Figure 26-102. Message Buffer Index Registers (MBIDXRn)
Table 26-83. MBIDXRn Field Descriptions
Field Description
MBIDX Message Buffer Index — This field provides the index of the message buffer header field of the physical
message buffer that is currently associated with this message buffer.
The application writes the index of the initially associated message buffer header field into this register. The
controller updates this register after frame reception or transmission.