Rohde & Schwarz RTE - MDIO Display Settings

Protocol analysis
R&S
®
RTE
804User Manual 1326.1032.02 ─ 20
"Clock"
Defines the source settings for the clock line (management data
clock, MDC). Typically, select any of the analog channels "C1" – "C4"
or digital channels "D0" – "D15", depending on the test application.
"Math" or "Ref" waveforms are also permitted.
"Data"
Defines the source settings for the data signal. Typically, select any of
the analog channels "C1" – "C4" or digital channels "D0" – "D15",
depending on your application, but not the same as for "Clock".
"Math" or "Ref" waveforms are also permitted.
Remote command:
BUS<m>:MDIO:CLOCk:SOURce on page 1776
BUS<m>:MDIO:DATA:SOURce on page 1776
Thresholds
MDIO defines two thresholds for each source line:
●
Vih(min) is being used for the rising edge evaluation. This "h" (high) threshold is
the minimum value for the signal to be identified as "1". If the signal value comes
from a low state (hence, rising edge), the state remains to be considered as low
("0"), until it has risen above Vih(min).
●
Vil(max) is being used for the falling edge evaluation. This "l" (low) threshold is the
maximum level for the signal to be identified as "0". If the signal value comes from
a high state (hence, falling edge), the state remains to be considered as high ("1"),
until it has fallen below Vil(max).
There are four ways to set the thresholds for the digitization of the signal lines:
●
"Threshold"
Enter the values directly in the fields.
●
"Preset thresholds"
Allows to select the default threshold settings according to the Ethernet standard:
2.0 V and 0.8 V.
●
"Auto thresholds"
Executes a measurement of reference levels and sets the thresholds to the middle
reference level of the measured amplitude.
●
"Couple thresholds"
Overwrites the data thresholds with the clock thresholds.
Remote command:
BUS<m>:MDIO:CLOCk:THReshold:HIGH on page 1777
BUS<m>:MDIO:CLOCk:THReshold:LOW on page 1777
BUS<m>:MDIO:DATA:THReshold:HIGH on page 1777
BUS<m>:MDIO:DATA:THReshold:LOW on page 1778
BUS<m>:MDIO:PRESet on page 1778
BUS<m>:SETReflevels on page 1421
BUS<m>:MDIO:COUPling on page 1778
13.15.2.2 MDIO display settings
Access: [PROTOCOL] > "Decode" tab > "Protocol = MDIO" > "Display" tab
To enhance the decode possibilities of the MDIO protocol, you can use an additional
setting in the "Display" tab: "Decode layer".
MDIO (option R&S
RTE-K55)