Crystal Vision
Card edge operation
DEC104S User Manual R1.0
29
29/10/04
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.
When the Hpos setting reaches the end of a video line it wraps round and the Vpos setting
is changed to provide continuous adjustment.
With an external analogue timing reference present the delay through the board depends
on these adjustments and the relative timing of the serial input and the analogue reference.
When both horizontal and vertical position settings are zero the delay thorough the board
will be minimum and the serial output will be timed to the analogue reference as per ITU-
R BT.601. The minimum delay through the board is approximately 1.7 lines in 10 bit
mode and 0.7 lines in 8 bit mode.
Using the phase control
Select position 8 (Phase) with the SEL control to allow the shaft encoder to adjust the
chroma phase relative to burst. This adjustment is available in 10 bit mode only. The
range of adjustment is 360 degrees, in steps of roughly 0.1degrees. When the maximum
adjustment is reached the value wraps around to zero.
Note:
The firmware version number is shown in 8 bit mode when SEL 8 is selected.
The timing adjustments are separate for 625 and 525 line operation and the settings are
automatically maintained when the unit is powered off and restored when the unit is
powered back on.
Adjusting input video timing
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
Select position 9 (H del) with the SEL control to allow the shaft encoder to adjust the
input video timing with respect to the input video syncs in steps of 37ns. This adjustment
is available in 10 bit mode only.
Note:
The firmware version number is shown in 8 bit mode when SEL 9 is selected. Do not
leave the SEL switch in position 9 as it also used as a power-up factory reset function.
The available range is -128 to +127 steps (r- 4.5 microseconds) relative to the
factory default position. The value cannot be adjusted outside this range.
