Timestamp Function - STMicroelectronics SPC572L series Reference Manual

Nexus Aurora Router (NAR)
WPHIT Description
b010000 Entering Suppress Mode
b100000 Client Sync
Trace Memory bus Block
b000100
Overflow (TBO)
b001000 Tracebuffer Wrap
65.5.11

Timestamp function

The NAR and all of its clients are required to transmit timestamps, to allow precise ordering
of events. All clients synchronous or asynchronous uses NAR timer value broadcasted over
a bus, this ensures that all timestamps are in sync as shown in
enable signal to centrally control the enabling of time stamping, which informs the clients to
start adding the timestamp field to their message traffic.
Client 1
Client 2
Client 3
1900/2058
Table 1066. Watchpoint Hit values
If (local or global) suppress mode is enabled and the appropriate trigger
is received, the NAR generates a watchpoint message. The type of
event (in this case, a suppress event) is encoded in the WPHIT field of
the watchpoint message (see the Nexus standard, sec. 5.3.21).
If sync messaging is enabled, the NAR generates a sync watchpoint
message whenever a client sync event occurs.
If the trace memory bus block is filled, causing it to either disable trace
memory bus data trace or wrap back to the beginning of the dedicated
debug memory block and if trace memory bus overflow messaging is
enabled, then an TBO message is generated.
If the NAR is being used in tracebuffer mode with the wrap-around
feature, then a watchpoint message is generated every time the
tracebuffer wraps back to address 0. This would be useful in informing
the user that the buffer had wrapped and that older data had been
overwritten.
Figure 1124. Timestamp architecture
timestamp
enable signal
timestamp mode
time count
Nexus data1
Nexus data2
Nexus data3
DocID027809 Rev 4
Comment
Figure 1124. The NAR uses
NAR
port1
port2
port3
RM0400