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©
Copyright 2004 Cirrus Logic, Inc.
DS651UM21
Version 2.1
CobraNet Hardware User’s Manual
Synchronization
5.1.4 External Master Clock Mode
The VCXO is disabled and MCLK_IN is used as the master clock for the node. This is a
“hard” synchronization mode. The supplied clock is used directly by the CobraNet
interface for all timing. This mode is primarily useful for devices with multiple CobraNet
interfaces sharing a common master audio clock. The supplied clock must be
24.576 MHz. The supplied clock must have a ±37 ppm precision.
Conductor—The entire network is synchronized to the supplied master clock.
Performer—The node will initially lock to the network clock and will “jam sync” via the
supplied master clock. The external clock source must be synchronous with the network
conductor.
5.1.5 External Master Clock Mode with External Sample Synchronization
This mode is identical to
External Master Clock
mode except that it allows
synchronization of the derived clocks (sample clock, audio bit clock) to an external source
via the reference clock input. This additional functionality is useful when adapting the
CobraNet interface to a device that already has circuitry for generating derived clocks of
its own.
Conductor—The entire network is synchronized to the supplied master clock.
Performer—The node will initially lock to the network clock and will “jam sync” via the
supplied master clock. The external clock source must be synchronous with the network
conductor.
