Crystal Vision
Card edge operation
24
DEC101SUser ManualV1.0 05/11/03
The active output timing reference
The horizontal and vertical timing adjustments operate relative to one of two analogue
timing references. These are an external reference or an internal free-running clock.
When an external analogue timing reference is present serial output timing is maintained
relative to the external analogue reference.
When no external analogue timing reference present the serial output is timed to the free
running clock.
The following tables summarises the possible output timing reference sources:
Active timing reference
Ext Ref
External analogue input
Present
Free running internal clock
Not present
Adjusting signal timing
Use rotary switch (SEL) positions 5 and 6 together with the shaft encoder to change the
following:
•
Horizontal and vertical output timing relative to the current reference
SEL
Display Text
Description
5
H Pos 0
The shaft encoder adjusts the output video timing relative to the analogue timing
reference in increments of 37ns. When the maximum adjustment of one line is
reached the value wraps round to zero and the Vpos adjustment is modified.
6
V Pos 0
The shaft encoder adjusts the output video timing relative to the analogue timing
reference in increments of whole video lines. When the maximum adjustment of
one frame is reached the value wraps round to zero.
8/9
Version No.
Version number is displayed.
Adjusting horizontal and vertical timing
The output timing can be adjusted through an entire frame using the Vpos and Hpos
settings.
Increasing the vertical position setting will delay the output relative to the reference in
increments of one video line. Select position 6 (V Pos) with the 'SEL' control to allow the
shaft encoder to adjust the vertical output timing. The range of adjustment is one video
frame. When the maximum adjustment is reached the value wraps around to zero.
Increasing the horizontal position setting will delay the output relative to the reference in
increments of 37ns. Select position 5 (H Pos) with the 'SEL' control to allow the shaft
encoder to adjust the horizontal output timing. The range of adjustment is one video line.