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Errata Sheet
Functional Deviations
Therefore the state machine of the upstream channel is sensing for an incoming
new startbit (high-low edge) in the last state of a frame. If there is no edge, the
state machine changes to idle state. If an edge is recognized, the state machine
will start receiving the next frame. Under certain timing conditions, the start-bit
of an upstream-frame which is send without any idle-time, directly after the
previous frame, will not be recognized and therefore this frame will not be
received correctly. In that case the startbit might be recognized erroneously
whithin the dataframe. The missbehaviour can occur if the high-low edge of the
start-bit is located close to the rising edge of the internal MSC module-clock and
is jittering around this clock-edge.
Uncritical transmission
A) Uncritical transmission:
Start of Frame 1
End of Frame 1 / Start of Frame 2
1. startbit-edge
2. startbit-edge
Stop-Bit
Stop-Bit
Jitter
SDI
Jitter
Edge-detection
Edge-detection
Edge-detection
<IDLE>
0
0
1
1
fMSC
0
Figure 3
n
1
Uncritical transmission
As the falling startbit edge is shifted to the left of the rising clock edge (Figure 3
left), there occurs a secure detection of the next start-bit edge in the last cycle
of the previous frame (here cycle n, Figure 3 right) independant from the
applied jitter to this edge.
TC1766, ES-BD, BD
111/182
Rel. 1.3, 2014-02-21