Table 3-51. Tx Buffer Element Description (continued)
... ...
Tn Bits 31:24 DBm[7:0]: Data Byte m
Tn Bits 23:16 DBm-1[7:0]: Data Byte m-1
Tn Bits 15:8 DBm-2[7:0]: Data Byte m-2
Tn Bits 7:0 DBm-3[7:0]: Data Byte m-3
NOTE
Depending on the configuration of the element size (TXESC),
between two and sixteen 32-bit words (Tn = 3 ..17) are used for
storage of a CAN message’s data field.
3.4.3 Tx Event FIFO Element
Each element stores information about transmitted messages. By reading the Tx Event
FIFO the Host CPU gets this information in the order the messages were transmitted.
Status information about the Tx Event FIFO can be obtained from register TXEFS.
Table 3-52. Tx Event FIFO Element
31 24 23 16 15 8 7 0
E0
E
SI
X
T
D
R
T
R
ID[28:0]
E1
MM[7:0]
ET[1:
0]
E
D
L
B
R
S
DLC[3:0] TXTS[15:0]
Table 3-53. Tx Event FIFO Element Description
E0 Bit 31 ESI: Error State Indicator
0 Transmitting node is error active
1 Transmitting node is error passive
E0 Bit 30 XTD: Extended Identifier
0 11-bit standard identifier
1 29-bit extended identifier
E0 Bit 29 RTR: Remote Transmission Request
0 Data frame transmitted
1 Remote frame transmitted
E0 Bits 28:0 ID[28:0]: Identifier
Standard or extended identifier depending on bit XTD. A standard identifier is stored into ID[28:18].
Table continues on the next page...
Chapter 3 Modular CAN (M_CAN)
MPC5777C Reference Manual Addendum, Rev. 1, 12/2015
Freescale Semiconductor, Inc. 83
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