Freescale Semiconductor FlexRay MFR4310 - Figure 3-20. Protocol Status Register 3 (PSR3)

FlexRay Module (FLEXRAYV4)
MFR4310 Reference Manual, Rev. 2
94 Freescale Semiconductor
3.3.2.21 Protocol Status Register 3 (PSR3)
This register provides aggregated channel status information as an accrued status of channel activity for
all communication slots, regardless of whether they are assigned for transmission or subscribed for
reception. It provides accrued information for the symbol window, the NIT, and the wakeup status. The
application can clear any flag at any time by writing a 1 to it. Writing a 0 does not change the flag state. If
the application tries to clear a flag while the FlexRay module sets the flag at the same time, then that flag
is not cleared.
6
SBVA
Symbol Window Boundary Violation on Channel A — protocol related variable: vSS!BViolation for symbol
window on channel A
This status bit is set if there was some media activity on the FlexRay bus channel A at the start or at the end of
the symbol window.
0 No such event
1 Media activity at boundaries detected
5
SSEA
Symbol Window Syntax Error on Channel A — protocol related variable: vSS!SyntaxError for symbol window
on channel A
This status bit is set when a syntax error was detected during the symbol window on channel A.
0 No such event
1 Syntax error detected
4
MTA
Media Access Test Symbol MTS Received on Channel A — protocol related variable: vSS!ValidMTS for
symbol window on channel A
This status bit is set if the Media Access Test Symbol MTS was received in the symbol window on channel A.
1 MTS symbol received
0 No such event
3–0
CLKCORR-
FAILCNT
Clock Correction Failed Counter — protocol related variable: vClockCorrectionFailed
This field provides the number of consecutive even/odd communication cycle pairs that have passed without
clock synchronization having performed an offset or a rate correction due to lack of synchronization frames. It is
not incremented when it has reached the configured value of max_without_clock_correction_fatal or
max_without_clock_correction_passive as defined in the Protocol Configuration Register 8 (PCR8). The
FlexRay module resets this counter on a hard reset condition, when the protocol enters the POC:normal active
state, or when both the rate and offset correction terms have been calculated successfully.
0x002E Additional Reset: RUN Command Write: Normal Mode
1514131211109876543210
R0 0
WUB ABVB AACB ACEB ASEB AVFB
00
WUA ABVA AACA ACEA ASEA AVFA
W
Reset0000000000000000
Figure 3-20. Protocol Status Register 3 (PSR3)
Table 3-27. PSR2 Field Descriptions (Continued)
Field Description