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User's Guide HDSP System Multiface II © RME
51
The word clock input of the Hammerfall DSP is a high-impedance type ensuring maximum flexi-
bility, and is therefore not terminated. If normal termination is necessary (e.g. because Ham-
merfall DSP is the last device in the chain), simply connect a T-adapter to its BNC input jack,
connect the cable supplying the word clock signal to one arm of the T-adapter and terminate the
other with a 75 Ohm resistor (as a short BNC plug).
In case Hammerfall DSP resides within a chain of devices receiving word clock, plug a T-
adapter into Hammerfall DSP’s BNC input jack and the cable supplying the word clock signal to
one end of the adapter (as above), but connect the free end to the next device in the chain via a
further BNC cable. The last device in the chain should be terminated using another T-adapter
and a terminator plug as described in the previous paragraph.
27.3 Operation
The Multiface's word clock input is active when Pref. Sync Ref in the Settings dialog has been
set to Word Clock, the clock mode AutoSync has been activated, and a valid word clock signal
is present. The signal at the BNC input can be Single or Double Speed, the Hammerfall DSP
automatically adapts to it. As soon as a valid signal is detected, the green WC LED on the front
(DIGITAL STATE) is lit, and the Settings dialog shows either Lock or Sync (see chapter 34.1).
As soon as there is a valid signal at the BNC jack, AutoSync Ref will display Word. This mes-
sage has the same function as the green Lock LED on the front, but appears on the monitor, i.e.
the user can check immediately whether a valid word clock signal is present and is currently
being used.
In the line Freq., the AutoSync Ref shows the frequency of the reference signal, measured by
the hardware. In this case the frequency of the current wordclock signal is measured and dis-
played.
The word clock output of the Hammerfall DSP is constantly active, providing the current sample
frequency as word clock signal. As a result, in Master mode the provided word clock is defined
by the currently used software. In Slave mode, the provided frequency is identical to the one
present at the currently chosen clock input. When the current clock signal fails, the Hammerfall
DSP switches to Master mode and adjusts itself to the next, best matching frequency (44.1 kHz,
48 kHz etc.).