Crystal Vision
Using the front control panel
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DEC102SUser ManualV1.0 05/11/03
Adjusting signal timing
Press F4 from the home menu to display the Timing menu, which provides the following
timing functions:
•
Output timing relative to the external reference
•
Chroma phase relative to burst (10 bit mode only)
•
Input video timing (10 bit mode only)
Timing menu structure
Description
Use the ‘F’ buttons below each function to enable
the ADJ shaft encoder to change values.
F1: ADJ sets VPOS (output timing in one line steps)
F2: ADJ sets HPOS (output timing in 37ns steps)
F3: ADJ sets PHSE (chroma timing in 0.1
°
steps)
F4: ADJ sets HDEL (input timing in 37ns steps)
Different horizontal and vertical timing adjustments can be maintained for 625 and 525
line operation. However, the horizontal delay is common to both 525 and 625
Note:
The horizontal delay (HDEL) and phase control (PHSE) are not available in 8-bit mode.
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 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
