User Manual

User's Guide MADIface XT © RME

19.6 Clock

Source and frequency of the unit’s clock are configured in Options – Clock. Clock Source offers

several choices for the current clock source: internal clock or external clock (WCK = Word

clock, AES, MADI 1-3). Sample Rate sets the sample rate for both external and internal clock.

WCK, AES, MADI 1-3 (Slave Mode)

Activates the corresponding input as clock reference. In case of a missing or invalid clock

source signal the display of the current sample rate in the lower right corner of the display turns

to red, then the unit changes to its internal clock.

INT (Master Mode)

Activates the internal clock.

With a setting of INT (internal clock) it is mandatory that the clock rate of the sources is

synchronous to the MADIface. Therefore the external device has to be synchronized to the

MADIface word clock output or AES/MADI output.

The MADIface thus has to be master, all devices connected to it must be slave. In order to

avoid clicks and drop outs due to faulty or missing synchronicity, a special process called Sync-

Check compares the incoming data and the MADIface’s internal clock. The sync state is indi-

cated by a flashing (error) or constantly lit (OK) field in the display.

A selection of Double and Quad Speed is also possible when using external clock (Slave). If the

MADIface should operate at 192 kHz, but receives a synchronous word clock of 48 kHz, set

Sample Rate to that value. This way, AD/DA-conversion and digital outputs are configured to

operate in the frequency ranges Single Speed, Double Speed or Quad Speed.

Single Speed

All outputs carry a signal in the range of 32 kHz up to 48 kHz.

DS (Double Speed)

The AES output carries a signal in the range of 64 kHz up to 96 kHz. MADI stays at no higher

than 48 kHz, with the data transmitted in the S/MUX format (48K Frame), or changes to native

96 kHz (96K Frame). In both cases the number of channels is reduced to 32 per port.

QS (Quad Speed)

The AES output carries a signal in the range of 176.4 kHz up to 192 kHz. MADI stays at no

higher than 48 kHz, with the data transmitted in the S/MUX4 format. Therefore MADI is limited

to 16 channels per port in this mode.