mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 196

• Manufacturer Part Number: mfr4300
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

FlexRay Module (FLEXRAYV2)
vector provided by the PE. All static slots, the symbol window, and the NIT status are taken into account.
Dynamic slots are excluded. The internal slot status counting and update timing is shown in
The PE provides the status of the NIT in the first slot of the next cycle. Due to these facts, the SSCRn
register reflects, in cycle n, the status of the NIT of cycle n-2, and the status of all static slots and the
symbol window of cycle n-1.
The increment condition for each slot status counter consists of two parts, the frame related condition part
and the slot related condition part. The internal slot status counter SSCRn_INT is incremented if at least
one of the conditions is fulfilled:
and
196
SSCRn:= SSCRn_INT
1. frame related condition:
•
•
2. slot related condition:
•
(SSCCRn.VFR | SSCCRn.SYF | SSCCRn.NUF | SSCCRn.SUF) // count on frame condition
= ‘1’;
((~SSCCRn.VFR | vSS!ValidFrame) & // valid frame restriction
(~SSCCRn.SYF | vRF!Header!SyFIndicator) & // sync frame indicator restriction
(~SSCCRn.NUF | ~vRF!Header!NFIndicator) & // null frame indicator restriction
(~SSCCRn.SUF | vRF!Header!SuFIndicator)) // startup frame indicator restriction
= ‘1’;
((SSCCRn.STATUSMASK[3] & vSS!ContentError) | // increment on content error
(SSCCRn.STATUSMASK[2] & vSS!SyntaxError) | // increment on syntax error
(SSCCRn.STATUSMASK[1] & vSS!BViolation) | // increment on boundary violation
slot 1
incr. SSCRn_INT on error
static segment
The indicator bits SYF, NUF, and SUF are valid only when a valid frame
was received. Thus it is required to set the VFR always, whenever count on
frame condition is used.
Figure 3-140. Slot Status Counting and SSCRn Update
dynamic segment
MFR4300 Data Sheet, Rev. 3
SSCRn_INT not updated
communication cycle
NOTE
symbol window
incr. SSCRn_INT on error
Freescale Semiconductor
NIT
SSCRn:= SSCRn_INT
Figure
3-140.