NXP Semiconductors PXN2020 - Page 708

FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
26-94 Freescale Semiconductor
Transmit Message Buffer Slot Status Description
This section describes the slot status structure for transmit message buffers. Only the TCA and TCB status
bits are directly related to the transmission process. All other status bits in this structure are related to a
receive process that may have occurred. The content of the slot status structure for transmit message
buffers depends on the channel assignment as given by Table 26-89.
The meaning of the bits in the slot status structure is described in Table 26-88.
Figure 26-115. Transmit Message Buffer Slot Status Structure (ChAB)
SYA Sync Frame Indicator Channel A — protocol related variable: vRF!Header!SyFIndicator channel A.
0 vRF!Header!SyFIndicator = 0.
1 vRF!Header!SyFIndicator = 1.
NFA Null Frame Indicator Channel A — protocol related variable: vRF!Header!NFIndicator channel A.
0 vRF!Header!NFIndicator = 0.
1 vRF!Header!NFIndicator = 1.
SUA Startup Frame Indicator Channel A — protocol related variable: vRF!Header!SuFIndicator channel A.
0 vRF!Header!SuFIndicator = 0.
1 vRF!Header!SuFIndicator = 1.
SEA Syntax Error on Channel A — protocol related variable: vSS!SyntaxError channel A.
0 vSS!SyntaxError = 0.
1 vSS!SyntaxError = 1.
CEA Content Error on Channel A — protocol related variable: vSS!ContentError channel A.
0 vSS!ContentError = 0.
1 vSS!ContentError = 1.
BVA Boundary Violation on Channel A — protocol related variable: vSS!BViolation channel A.
0 vSS!BViolation = 0.
1 vSS!BViolation = 1.
Table 26-89. Transmit Message Buffer Slot Status Content
Transmit Message Buffer Type Slot Status Content
Individual Transmit Message Buffer assigned to both channels
MBCCSRn[CHA] = 1 and MBCCSRn[CHB] = 1
see Figure 26-115
Individual Transmit Message Buffer assigned to channel A
MBCCSRn[CHA] = 1 and MBCCSRn[CHB] = 0
see Figure 26-116
Individual Transmit Message Buffer assigned to channel B
MBCCSRn[CHA] = 0 and MBCCSRn[CHB] = 1
see Figure 26-117
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R VFB SYB NFB SUB SEB CEB BVB TCB VFA SYA NFA SUA SEA CEA BVA TCA
Reset – – – – – – – – – – – – – – – –
Table 26-88. Receive Message Buffer Slot Status Field Descriptions (continued)
Field Description