User`s guide

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Logic Analyzer Concepts
The Analyzer Hardware
Pattern Generator board theory
Pattern Generator Board
Loop Register
The loop register holds the programmable vector flow information.
When the module reaches the end of the vector listing, the loop
register is queried for the RAM address location of the next user-
programmed vector. In many cases, the next vector address location
would be the start of the vector listing. Consequently, the vectors
would continue to loop from the end of the listing back to the beginning
until you instruct the module to stop.