NXP Semiconductors MPC5644A, Reference Manual, Page: 1462 / 1735

FlexRay Communication Controller (FlexRay)
MPC5644A Microcontroller Reference Manual, Rev. 6
1462 Freescale Semiconductor
33.5.2.8 Message Buffer Segment Size and Utilization Register (FR_MBSSUTR)
This register is used to define the last individual message buffer that belongs to the first message buffer
segment and the number of the last used individual message buffer.
33.5.2.9 PE DRAM Access Register (FR_PEDRAR)
Table 33-13. FR_MBDSR field description
Field Description
MBSEG2DS Message Buffer Segment 2 Data Size — The field defines the size of the message buffer data
section in two-byte entities for message buffers within the second message buffer segment.
MBSEG1DS Message Buffer Segment 1 Data Size — The field defines the size of the message buffer data
section in two-byte entities for message buffers within the first message buffer segment.
Base + 0x000E Write: POC:config
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R 0
LAST_MB_SEG1
0
LAST_MB_UTIL
W
Reset 0 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1
Figure 33-8. Message Buffer Segment Size and Utilization Register (FR_MBSSUTR)
Table 33-14. FR_MBSSUTR field description
Field Description
LAST_MB_SEG1 Last Message Buffer In Segment 1 — This field defines the message buffer number of the last
individual message buffer that is assigned to the first message buffer segment. The individual
message buffers in the first segment correspond to the message buffer control registers
FR_MBCCSRn, FR_MBCCFRn, FR_MBFIDRn, FR_MBIDXRn with n < LAST_MB_SEG1. The
first message buffer segment contains LAST_M 1 individual message buffers.
Note: The first message buffer segment contains at least one individual message buffer.
The individual message buffers in the second message buffer segment correspond to the
message buffer control registers FR_MBCCSRn, FR_MBCCFRn, FR_MBFIDRn, FR_MBIDXRn
with LAST_MB_SEG1 < n < 128.
Note: If LAST_MB_SEG1 = 127 all individual message buffers belong to the first message buffer
segment and the second message buffer segment is empty.
LAST_MB_UTIL Last Message Buffer Utilized — This field defines the message buffer number of last utilized
individual message buffer. The message buffer search engine examines all individual message
buffer with a message buffer number n < LAST_MB_UTIL.
Note: If LAST_MB_UTIL=LAST_MB_SEG1 all individual message buffers belong to the first
message buffer segment and the second message buffer segment is empty.
Base + 0x0010 16-bit write access required Write: Normal Mode
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R
INST ADDR
DAD
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 33-9. PE DRAM Access Register (FR_PEDRAR)