Protocol analysis
R&S
®
RTP
749User Manual 1337.9952.02 ─ 12
"Second Edge"
●
At "Idle" = "low": data are captured on the clock's falling edge
(high-to-low transition) and propagated on a rising edge.
●
At "Idle" = "high": data are captured on the clock's rising edge
(low-to-high transition) and propagated on a falling edge.
Note: The requirement to specify "First Edge" or "Second Edge" (or
let the decoder decide) has the following background: In Manchester
coding, an edge is always a transition from high to low (0) or from low
to high (1). However, if the signal comes from the idle state, this
implies that right before the first valid edge, there is always an over-
head transition from idle to high or from idle to low. Some standards
may regard this as a valid transition. To avoid a potentially ambiguous
situation, a decision has to be made if the first edge is indeed only
some overhead transition ‐ or a transition that needs to be sampled.
For more details on edge conditions, see Chapter 13.15.1.1, "Special
features of Manchester coding", on page 744.
Remote command:
BUS<m>:CMSB:MANChester:CPHase on page 1935
Clock Phase (NRZ Clocked)
Defines the phase of the custom serial bus clock signal for the coding standard "NRZ
Clocked", depending on "Clock Polarity". The available settings are:
"First Edge"
●
At "Idle" = "low": data are captured on the clock's rising edge
(low-to-high transition) and propagated on a falling edge
●
At "Idle" = "high": data are captured on the clock's falling edge
(high-to-low transition) and propagated on a rising edge
"Second Edge"
●
At "Idle" = "low": data are captured on the clock's falling edge
(high-to-low transition) and propagated on a rising edge
●
At "Idle" = "high": data are captured on the clock's rising edge
(low-to-high transition) and propagated on a falling edge
Remote command:
BUS<m>:CMSB:NRZ:CPHase on page 1937
Enable Source (NRZ)
Defines the input source for the custom serial bus enable signal.
If an input is chosen, signals are only decoded when this channel is in the enabled
state. This allows you to mark a time when the signal on the selected source is active
and when not.
Permitted source selections are the analog, mathematical, and reference channels.
When the serial bus trigger has been selected, the only permitted source selections
are the analog channels "C1" – "C4", which are required for triggering.
Math and Reference channels can only be selected, if no serial bus trigger is selected.
Remote command:
BUS<m>:CMSB:NRZ:ENBLe on page 1937
Enable Polarity (NRZ)
Selects whether the transmitted enable signal is active when the voltage is below the
Set Thresholds ("Enable low") or higher than it ("Enable high").
Custom: Manchester / NRZ (option R&S
RTP-K50)M
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