Timing parameters – RGB Spectrum Quadra User's Guide User Manual
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C O M M A N D L I N E I N T E R F A C E
Timing Parameters
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Quadra User’s Guide
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T I M I N G P A R A M E T E R S
The table below lists timing parameters, values and ranges used for both the
input and output timing functions. Advanced users can also use the table to
assist with values listed in the “
For example, if you type
INT
to query the system’s Input Timing
values, you will get a string of values (
will greatly assist in clarifying each value’s meaning.
Note
Internally, Quadra maintains two separate lists of timing
parameters — one for inputs and one for output timings.
However, the parameter definitions and ranges are identical
for both lists.
Table 4-16.
Definitions and Ranges for Timing Parameters
Parameter
Definitions
Ranges
Comments
HFP
Horizontal front porch
0 to 640 pixels
The beginning of the horizontal
blanking interval.
HS
Horizontal sync
16 to 640 pixels
The width of the horizontal
synchronizing pulse
HBP
Horizontal back porch
0 to 640 pixels
The end of the horizontal
blanking interval. The total
horizontal blanking = HFP +
HS + HBP.
HACT
Horizontal active
16 to 1920 pixels
The active picture interval (non-
blanked portion of the image).
The total pixel count per line =
HACT + HFP + HS + HBP.
VFP
Vertical front porch
0 to 512 lines
The part of vertical blanking
prior to the vertical sync.
VS
Vertical sync
2 to 32 lines
The width of the vertical sync
period.
VBP
Vertical back porch
0 to 512 lines
The part of the vertical blanking
signal following the vertical
sync interval.
VACT
Vertical active
12 to 1440 lines
The number of active lines of
picture.
VTOT
Total Vertical line count
NA
This parameter is measured by
Quadra
. Users may not define
this value, but the sum of VFP +
VS + VACT must equal VTOT.
HFREQ
Horizontal frequency in
Hz
12.5 to 125 kHz
This parameter is measured by
Quadra
. This is a read only
parameter.