PXS20RM Datasheet, PDF (750/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

FlexRay Communication Controller
26.5.2.23 Protocol Status Register 2 (FR_PSR2)
Base + 0x002C
Additional Reset: RUN Command
0
1
2
3
4
5
6
7
8
9
10
11
R NBVB NSEB STCB SBVB SSEB MTB NBVA NSEA STCA SBVA SSEA MTA
W
Reset 0
0
0
0
0
0
0
0
0
0
0
0
Figure 26-23. Protocol Status Register 2 (FR_PSR2)
12
13
14
15
CLKCORRFAILCNT
0
0
0
0
This register provides a snapshot of status information about the Network Idle Time NIT, the Symbol
Window and the clock synchronization. The NIT related status bits NBVB, NSEB, NBVA, and NSEA are
updated by the CC after the end of the NIT and before the end of the first slot of the next communication
cycle. The Symbol Window related status bits STCB, SBVB, SSEB, MTB, STCA, SBVA, SSEB, and
MTA are updated by the CC after the end of the symbol window and before the end of the current
communication cycle. If no symbol window is configured, the symbol window related status bits remain
in their reset state. The clock synchronization related CLKCORRFAILCNT is updated by the CC after the
end of the static segment and before the end of the current communication cycle.
Table 26-28. FR_PSR2 field descriptions
Field
NBVB
NSEB
STCB
SBVB
SSEB
Description
NIT Boundary Violation on Channel B — protocol related variable: vSS!BViolation for NIT on
channel B
This status bit is set when there was some media activity on the FlexRay bus channel B at the end
of the NIT.
0 No such event
1 Media activity at boundaries detected
NIT Syntax Error on Channel B — protocol related variable: vSS!SyntaxError for NIT on channel
B
This status bit is set when a syntax error was detected during NIT on channel B.
0 No such event
1 Syntax error detected
Symbol Window Transmit Conflict on Channel B — protocol related variable: vSS!TxConflict
for symbol window on channel B
This status bit is set if there was a transmission conflict during the symbol window on channel B.
0 No such event
1 Transmission conflict detected
Symbol Window Boundary Violation on Channel B — protocol related variable: vSS!BViolation
for symbol window on channel B
This status bit is set if there was some media activity on the FlexRay bus channel B at the start or
at the end of the symbol window.
0 No such event
1 Media activity at boundaries detected
Symbol Window Syntax Error on Channel B — protocol related variable: vSS!SyntaxError for
symbol window on channel B
This status bit is set when a syntax error was detected during the symbol window on channel B.
0 No such event
1 Syntax error detected
26-38
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor