Crystal Vision
Card edge operation
DEC104S User Manual R1.0
28
29/10/04
SEL
Display Text
Description
5
H Pos 0
The shaft encoder adjusts the output video timing relative to the active 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 active 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
Phase 0
(version number
shown in 8 bit mode)
In 10 bit mode chroma phase relative to burst can be adjusted in steps of
approximately 0.
1
o
. The display shows the difference from the default setting
in whole degrees.
9
H del +0
(version number
shown in 8 bit mode)
In 10 bit mode the timing of the input video relative to the input syncs can be
adjusted in 37ns steps. The range is -128 to +127, giving approxi/-
4.75 microseconds relative to the factory default timing. The display indicates
the number of adjustment steps used.
Do not leave the SEL switch in position 9 as it also used as a power-up factory
reset function.
The active output timing reference
The horizontal and vertical timing adjustments operate relative to one of three analogue
timing references. These are an external reference, the composite or YC input or an
internal free-running clock. Which of these is the active reference is dependent on the
presence of an external reference or whether an 8 bit or 10 bit mode is in operation.
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 timing depends on
whether the decoder is in 10 or 8 bit mode. In 10 bit mode the serial output is timed to the
composite or Y/C input. In 8 bit mode the output is timed to a free running factory set
clock.
The following tables summarises the possible output timing reference sources:
Active timing reference
Ext Ref
Mode
External analogue input
Present
10 or 8 bit
Composite or Y/C input
Not present
10 bit
Free running internal clock
Not present
8 bit
The horizontal delay adjustment varies the timing of the input video relative to input
syncs and blanking in 10 bit mode whichever source is the active reference.
Mode
Input video timing
10 bit
8 bit
Relative to input video syncs and blanking
No horizontal delay available
