Protocol analysis
R&S
®
RTE
773User Manual 1326.1032.02 ─ 20
"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 1738
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 1738
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").
Remote command:
BUS<m>:CMSB:NRZ:ENAPolarity on page 1739
Set Thresholds
Sets the threshold value for the digitization of each signal line and the hysteresis. If the
signal voltage on the line is higher than the upper threshold, the signal state is high.
Otherwise, if the signal voltage is below the lower threshold, the signal state is consid-
ered low.
●
Manchester coding standards use 3-state signals with an upper and a lower volt-
age threshold in the range of -25 V to +25 V. A low-to-high transition requires the
signal to exceed the upper threshold; a high-to-low transition requires the signal to
fall below the lower threshold.
You can set a hysteresis only for the enable signal.
●
NRZ coding standards use a single voltage threshold for the data line. The value is
in the range of -25 V to +25 V. It is entered into the middle of three available thresh-
old input fields, or into the upper available threshold input field for NRZ Unclocked.
You can set the hysteresis for all signal lines.
●
In the NRZ Clocked coding standard, there is an additional clock voltage threshold
available. This value in the range of -25 V to +25 V is entered into the upper
threshold input field.
You can set the hysteresis for the clock line.
Custom: Manchester / NRZ (option R&S
RTE-K50)M
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