Rohde & Schwarz SMW200A - Page 246

Configuring the Internal Baseband Source
R&S
®
SMW200A
231User Manual 1175.6632.02 ─ 16
Table 4-4: Output connectors for the reference clock signal (standard baseband)
Connector Location GUI selection
T/M/C Local connectors on each
board
To configure the connector:
●
"Custom. Dig. Mod/Digital Standard > Clock
Settings > Local Connectors > Direction >
Output"
●
"Custom. Dig. Mod/Digital Standard > Clock
Settings > Local Connectors > Signal > Sym-
bol Clock"
To enable the clock source
●
"Custom. Dig. Mod/Digital Standard > Clock
Settings > Clock Source > Internal"
●
External clock reference
Supply the external clock via the connectors listed in Table 4-5.
Table 4-5: Input connectors for the external reference clock signal
Connector Location GUI selection
T/M/C Local connector on each
coder board
To configure the connector:
●
"Custom. Dig. Mod/Digital Standard > Clock Set-
tings > Local Connectors > Direction > Input"
●
"Custom. Dig. Mod/Digital Standard > Clock Set-
tings > Local Connectors > Signal > Clock"
To enable the clock source
●
"Custom. Dig. Mod/Digital Standard > Clock Set-
tings > Clock Source > External Local Clock"
The signals provided at the global and local connector are configurable. However,
there is a limitation on the number and the type of signals that are configured simulta-
neously, see Chapter 11.2.2.5, "Internal Resources for the Trigger, Marker, Clock and
Control Signals", on page 664.
Internal and external clock synchronization
When the external clock reference is selected, the internal clock is synchronized to it.
Internally, the instrument interprets the rising edge as the active edge. The active edge
of the external clock signal is configurable ("Local Connector Settings > Clock Input
Slope"). The active rising edge of the internal clock is synchronized with either the ris-
ing or the falling edge of the external clock reference.
Proper synchronization
The correct synchronization of the clock synthesizer requires that a special procedure
is maintained. Refer to "To apply an external clock signal" on page 286 for a descrip-
tion of the required steps.
Synchronizing data signals and clock signals
When selecting data signals and clock signals, the following operating modes are pos-
sible:
●
External clock and internal data
Common Functions and Settings in the Baseband Domain