Freescale Semiconductor FlexRay MFR4310 - Figure 3-19. Protocol Status Register 2 (PSR2); Table 3-26. PSR1 Field Descriptions

FlexRay Module (FLEXRAYV4)
MFR4310 Reference Manual, Rev. 2
92 Freescale Semiconductor
3.3.2.20 Protocol Status Register 2 (PSR2)
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 FlexRay module after the end of the NIT and before the end of the first slot of the next
Table 3-26. PSR1 Field Descriptions
Field Description
15
CSAA
Cold Start Attempt Aborted Flag — Protocol related event: Set coldstart abort indicator in CHI’
This flag bit is set when the FlexRay modulehas aborted a cold start attempt. The application clears this flag by
writing 1 to it. Writing a 0 does not change the state of the flag. If the application clears the flag while the FlexRay
module sets the flag at the same time, then the flag is not cleared.
0 No such event
1 Cold start attempt aborted
14
CSP
Leading Cold Start Path — This status bit is set when the FlexRay module has reached the POC:normal active
state via the leading cold start path. This indicates that this node has started the network
0 No such event
1 POC:normal active reached from POC:startup state via leading cold start path
12–8
REMCSAT
Remaining Coldstart Attempts — protocol related variable: vRemainingColdstartAttempts
This field provides the number of remaining cold start attempts that the FlexRay module executes.
7
CPN
Leading Cold Start Path Noise — protocol related variable: vPOC!ColdstartNoise
This status bit is set if the FlexRay module has reached the POC:normal active state via the leading cold start
path under noise conditions. This indicates there was some activity on the FlexRay bus while the FlexRay
module was starting up the cluster.
0 No such event
1 POC:normal active state was reached from POC:startup state via noisy leading cold start path
6
HHR
Host Halt Request Pending — protocol related variable: vPOC!CHIHaltRequest
This status bit is set when FlexRay module receives the HALT command from the application via the Protocol
Operation Control Register (POCR). The FlexRay module clears this status bit after a hard reset condition or
when the protocol is in the POC:default config state.
0 No such event
1 HALT command received
5
FRZ
Freeze Occurred — protocol related variable: vPOC!Freeze
This status bit is set when the FlexRay module has reached the POC:halt state due to the host FREEZE
command or due to an internal error condition requiring immediate halt. The FlexRay module clears this status
bit after a hard reset condition or when the protocol is in the POC:default config state.
0 No such event
1 Immediate halt due to FREEZE or internal error condition
4–0
APTAC
Allow Passive to Active Counter — protocol related variable: vPOC!vAllowPassivetoActive
This field provides the number of consecutive even/odd communication cycle pairs that have passed with valid
rate and offset correction terms, but the protocol remains in the POC:normal passive state due to an application
configured delay to enter POC:normal active state. This delay is defined by the allow_passive_to_active field in
the Protocol Configuration Register 12 (PCR12)..
0x002C Additional Reset: RUN Command
1514131211109876543210
R NBVB NSEB STCB SBVB SSEB MTB NBVA NSEA STCA SBVA SSEA MTA CLKCORRFAILCNT
W
Reset0000000000000000
Figure 3-19. Protocol Status Register 2 (PSR2)