Operating basics
TRIG OUT: This o
utput can be configured to output one of the following
signals: system clock (148.5 MHz), frame/field pulse (once per video frame
or field), line pulse (once per video line), or pixel clock. (See page 3-332,
SDI7 module TRIGGER OUTPUT submenu.)
When an interlaced format is selected, the frame/field pulse selection produces
a frame-rate square wave trigger output which is low during field one and
high during field two. The frame pulse selection produces the once per field
pulse for all other formats.
The frame/field pulse and the line pulse signals are derived from the signal
format of the selected trigger source (channel 1 or channel 2).
The rate of the pixel clock depends on the signal format of the selected trigger
source (channel 1 or channel 2):
27 MHz for SD formats
74.25 or 74.18 MHz for HD formats and most 3G formats (where 74.25
MHz is for integer frame rates and 74.18 MHz is for non-integer frame
rates such as 59.94, 29.97, and 23.98 fps)
(Option 3G only) 148.5 MHz for signal formats such as 50p and 60p;
148.35 MHz for signal formats such as 59.94p.
TG8000 Multiformat Test Signal Generator User Manual 2–19
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