DigiView Trigger Circuits

This page describes the underlying hardware that implements the trigger circuitry. It discusses the capabilities of the various sub-blocks and how they interact. This does NOT describe how the trigger hardware is managed by the software.

See Trigger Configuration for a summary of how the software makes configuring this hardware quick and easy.

DigiView Trigger block diagram

trigger circuit block diagram

Matches

DigiView has 8 universal match circuits. • Each match circuit can be configured to any of 9 different match types. • All match types are full-width (can include all active channels.) • Each match circuit can connect to any combination of product terms, allowing for match sharing.

  • Pattern Match
    • Match individual bit positions with X,0,1
    • With duration qualifiers
    • A single Match circuit can 'AND' together multiple signals
  • Edge Match
    • Match individual bit positions with X, ⮥, ⮧ or ⭥
    • A single match circuit can 'OR' together multiple signals
  • Range Matches
    • Match types: =, ≠, >, <, ≥, ≤
    • With duration qualifier
    • Handles sparse data (non-contiguous channel assignmets)
  • Stable Match
    • True when the specified bit positions all remain stable for the specified duration
    • A single Match circuit can 'AND' together multiple signals

Product Terms

  • Includes 8 product terms.
  • Each product term is essentially a programmable, 8-input 'AND' gate
  • Each input accepts any combination of Match circuit outputs.
  • Each output feeds all 17 Sum Term inputs
  • Permits match circuits to act as qualifiers for other match circuits. For example, an edge match could be qualified by a pattern match, so that the edge generates an event only if the pattern also matches.

Sum Terms

  • Includes 17 sum terms
  • Each sum term is essentially a programmable, 8-input 'OR' gate
  • Each input accepts any combination of the 8 product term outputs, allowing for product term sharing.
  • One sum term feeds directly to the Trigger output 'OR' gate. Each of the remaining sum terms feed one of the 16 sequencer stage inputs.
  • Allows for multiple, qualified, parallel trigger definitions.

Sequencers

  • Includes 4 separate, 4-stage sequencers
  • Sequencers can be cascaded to create longer sequences
  • Each stage includes a 1M count pass counter
  • Each sequencer output is connected to the trigger out or can be connected to the 'enable' of the next sequencer.

Trigger Out

  • Essentially a 5 input, programmable 'OR' gate
  • One input is connected to the direct-trigger sum-term output
  • The remaining 4 inputs are connected to the 4 sequencer outputs
  • The first to become true triggers the DigiView
Trigger Specifications
FeatureDescription
Operating speed:250MHz
Min. Detectable Duration:4ns
Match Circuits:8
Match Types:Each match circuit can be configured to any one of the following 9 match types:
Pattern (X,0,1), Edge (X,⮥,⮧,⭥), Stable, =, ≠, >, <, ≥, ≤.
Match width:Each match circuits operate across all channels. Edge specifies an 'OR' of multiple channels. The others specify an 'AND' of multiple channels.
Duration Qualifiers:Each match type (except edge) can specify min. duration the match must last to be valid.
Sequencers:4 - 4 stage sequencers. Can be cascaded in any combination. Each of the 16 stages contains a 1M count pass counter.
Sum-of-Products:Each match circuit is connected to 8, 8-input AND gates, allowing the matches to be shared and combined. Each of these product terms are connected to an OR gate on each sequencer stage input and on the direct trigger out. This is a fully poupulated sum-of-products array, allowing for much more advanced usage of the match circuits.

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DV509

DigiView DV509 Contents
9 channels
1Gsps@4ch
500Msps@9ch
Typical capture1:
100M Transitions, > 1B samples
4M-18M Protocol Characters/Bytes

$479

DV518

DigiView DV518 Contents
18 channels
1Gsps@4ch, 500Msps@9ch
250Msps@18ch
Typical capture1:
100M Transitions, > 1B samples
4M-18M Protocol Characters/Bytes

$599


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