m908 User Manual, Rev. G
system will slave to all other types of IO modules.
◦
aes-1-3 Sets one of the AES3 inputs as the clock source. AES3 1-3 are 8 channel
interfaces which each contain 4 AES3 signals. The system will synchronize to the
lowest numbered valid signal. All four signals must be at the same sample rate and
must be synchronous to each other.
◦
aes-4 Sets the aes-4 (XLR) as the clock source.
◦
spdif Sets the clock source to the SPDIF coaxial input.
◦
optical-1 Sets the clock source to the optical connector 1 (can be ADAT or TOSLINK)
◦
optical-2 Sets the clock source to the optical connector 2 (can be ADAT or TOSLINK)
6.3.22
Word Clock Termination Setup
Push the SETUP switch then push-hold the MUTE switch to enter the Setup System screen.
Turn the VOLUME encoder to scroll to and click on
clock termination
Options are <48kΩ , 75Ω>.
Push the Setup switch to save changes and exit Setup Mode.
6.3.23
Word Clock Output Setup
Push the SETUP switch then push-hold the MUTE switch to enter the Setup System screen.
Turn the VOLUME encoder to scroll to and click on
clock output
Options are <external, system clock,>
◦
<external> the signal on the word clock output BNC connector will be a buffered
copy of the signal on the word clock input BNC.
◦
<system clock> the signal on the word clock output BNC connector will be the
internal system clock source.
Note: If the system clock source is set to word clock and the word clock output is set
to system clock, then the output clock signal will be a re-clocked version of the input
clock.
Push the Setup switch to save changes and exit Setup Mode.
6.3.24
GPIO Setup
The m908 has 4 GPIO (General Purpose Input/Output) pins on various rear panel connectors.
These pins can be configured as logic level inputs or outputs and can be mapped to various
functions. The GPIO pins can be programmed to operate at 3.3V or 5.0V by moving jumpers on
the PCB. Built in pull up resistors allow for the use of external switch closures to trigger input
events.
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