Datasheet

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Table 26-138. Symbol Window and NIT Status Register (SWNIT) Field Descriptions (continued)
Bit Field Value Description
2 TCSA Transmission conflict in symbol window channel A.
0 No transmission conflict detected
1 Transmission conflict in symbol window detected on channel A
1 SBSA Slot boundary violation in symbol window channel A.
0 No slot boundary violation detected
1 Slot boundary violation during symbol window detected on channel A
0 SESA Syntax error in symbol window channel A.
0 No syntax error detected
1 Syntax error during symbol window detected on channel A
26.3.2.4.9 Aggregated Channel Status (ACS)
The aggregated channel status provides the host with an accrued status of channel activity for all
communication slots regardless of whether they are assigned for transmission or subscribed for reception.
The aggregated channel status also includes status data from the symbol phase and the network idle
time. The status data is updated (set) after each slot and aggregated until it is reset by the host. During
startup the status data is not updated. A flag is cleared by writing a 1 to the corresponding bit position.
Writing a 0 has no effect on the flag. This register is reset when the Communication Controller leaves
CONFIG state or enters STARTUP state.
Figure 26-154 and Table 26-139 illustrate this register.
Figure 26-154. Aggregated Channel Status Register (ACS) [offset_CC = 128h]
31 16
Reserved
R-0
15 13 12 11 10 9 8 7 5 4 3 2 1 0
Reserved SBVB CIB CEDB SEDB VFRB Reserved SBVA CIA CEDA SEDA VFRA
R-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 26-139. Aggregated Channel Status Register (ACS) Field Descriptions
Bit Field Value Description
31-13 Reserved 0 Read returns 0. Writes have no effect.
12 SBVB Slot boundary violation on channel B. One or more slot boundary violations were observed on channel
B at any time during the observation period (static or dynamic slots including symbol window and NIT).
0 No slot boundary violation observed
1 Slot boundary violation(s) observed on channel B
11 CIB Communication indicator channel B. One or more valid frames were received on channel B in slots that
also contained any additional communication during the observation period, i.e. one or more slots
received a valid frame AND had any combination of either syntax error OR content error OR slot
boundary violation.
0 No valid frame(s) received in slots containing any additional communication
1 Valid frame(s) received on channel B in slots containing any additional communication
10 CEDB Content error detected on channel B. One or more frames with a content error were received on
channel B in any static or dynamic slot during the observation period.
0 No frame with content error received
1 Frame(s) with content error received on channel B
1324
FlexRay Module SPNU563–May 2014
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