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Chapter 8: Theory of Operation

The 16740/41/42A logic analyzer as an expander

The logic analyzers can be connected together in multi-card master/expander

configuration. All of the functions of the logic analyzer configured as a master are

retained by the logic analyzer configured as an expander with a few exceptions.

As a master and expander multi-card logic analyzer module, most of the

supporting circuitry on the expander configured card is disabled to allow both

the master and expander cards to operate together as one module with no

compromise in functionality in 136-, 204-, 272-, or 340-channel configurations.

The same signals that drive the acquisition ICs on the master configured card also

drive the acquisition ICs on the expander configured card.

Acquisition. The four clocks sent to the master card are also sent to the

acquisition ICs on all expander cards. The acquisition ICs on the expander cards

individually generate their own sample clock for the state acquisition mode. For

timing acquisition mode, the master card also passes the synchronization signal

to the expander cards.

The four clock/data lines on expander card pods are not available for either state

mode clocking or state clock qualification. However, the four clock/data lines are

still available as data channels.

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Agilent Technologies 42A Spécifications Page 157