ADLINK Technology MCM-100, Руководство пользователя

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46 Operation
Leading
EDGE COMPUTING
Figure 4-13: Gated Trigger
Post-Trigger or Delay-Trigger Acquisition with Re-Trigger
Post-trigger or delay-trigger acquisition with re-trigger function is
indicated in applications where data is to be collected after several
trigger events. The number of scans after each trigger and the re-
trigger number are valid from 1 to the buffer size allocated in ker-
nel space. The process repeats until the specified amount of re-
trigger signals is detected.
4.3 Programmable Function I/O
The MCM-100/102 supports powerful programmable I/O function
provided by an FPGA chip, configurable as static digital input/out-
put, 32-bit frequency counters, pulse output, synchronization sam-
ple clock IN, and trigger IN. These signals are single-ended and
3.3 V/ TTL-compliant.
4.3.1 Static Digital Input/Output
Programmable function I/O can be used as static digital inputs or
outputs, with I/O lines readable and writeable by software polling,
with sample and update rate fully controlled by software timing.
4.3.2 Frequency Counter
Calculates base clocks occurring within a period (rising edge to
rising edge or falling edge to falling edge) of the repetitive input
signal, which is then converted to frequency value. Counter polar-
ity can be adjusted to rising edge active or falling edge active, with
maximum frequency measurable of 4MHz.
Time
Ɣ Operation start
Ɣ
Acquisition start
Trigger
Data N samples M samples
Ɣ Trigger event occurs
(high active)
Ɣ Trigger event occurs
(high active)
ƔƔƔƔ