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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
Functional Description 4-5
Linked
Used to describe two sequencers (DSA and DSB) on the
same DRM that are synchronized together.
Primary
Used to describe the DRM that provides all the timing for the
sequencers that are part of the DRS chain. DSA is always
coupled to the DRS chain and is the source of the timing and
control. DSB can be coupled to the new chain or run
independently from the chain. The primary module must be
located in the right most slot position in the VXI chassis
relative to the DRMs that will be coupled.
Secondary
Used to describe the DRMs located between the primary and
terminator module that pass the timing signals to the DRM in
the next lower slot position. Individual sequencers can be
coupled to the DRS or run independently from the primary
module as linked or not linked.
Terminator
Used to describe the DRM in the left most position of the DRS
chain. Individual sequencers can be coupled to the DRS or
run independently from the primary module as linked or not
linked.
LBUSA
VXI Local Bus A, used to connect adjacent modules.
LBUSC
VXI Local Bus C, used to connect adjacent modules.
CONTROL
Control signals used to set relay, driver and mux settings.
IMA
Inter-Module signals from DSA.
SIMA
Selected Inter-Module signal used by DSA.
IMB
Inter-Module signals from DSB.
SIMB
Selected Inter-Module signal used by DSB.
IMJMPR
T940 inter-module jumper. This jumper sets the DRS mode as
primary, secondary or terminator.
Note: Refer to DRS Inter-Module Mode Control in Chapter 2, Installation for
information on the Inter-Module Control jumper settings.
Description
The DRM utilizes the following VXI backplane resources to enable adjacent
DRMs to be synchronized together to form a DRS:
•
VXI Local Bus A/C (LBUSA/LBUSC) – Sequencer A on the primary module
drives all twelve LBUSA signals (Phases, Windows, Clocks and Jump Flag).
Both Sequencers can receive LBUSA and LBUSC signals.
•
VXI Triggers – Used for passing information between the DRS modules (e.g.
error flag, synchronization flag, reset signal, driver disable signal, channel
handshake)
T940 Inter-Module Mode Settings
The VXI
plug&play
API function that sets the inter-module mode is
“tat964_setModuleInterconnect”. The valid settings with reference to figure 4-3
are: