V
IDBLOX
3G-SL
AND
3G-NE
RX
M
ODULE
Publication 81-9059-0667-0, Rev. C
March 2011
Proprietary Information of PESA
4-26
Table 4-1 Modeline Parameters
(Example data for informational purposes only and may not apply to your specific requirements)
Parameter
Example
Parameter
Modeline
Notation
Function
Label Data
“1600X1200”
“Label”
Identifies Resolution Described by Modeline
Pixel
Clock
(in MHz)
155
Pclk
Describes the rate at which pixels are drawn. In this example, a pixel is drawn
every 1/(155 x 10
6
Hz) or approx. every 6.5 nanoseconds.
1600
Horizontal
Display
(Hdisp)
Hdisp indicates the horizontal resolution pixel count of 1600, but may also be
interpreted as a timing factor and used to calculate the time required to scan
across the visible portion of the display. In this example, there are 1600 pixels
requiring 1600 pixel clock cycles to draw. The time required for horizontal
display can be calculated in seconds as (Hdisp) X [1/(Pclk x 10
6
)] – in this
example approx. 10.3 microseconds. The blanking interval begins with the next
pixel clock cycle after the visible display is completed.
1656
Horizontal
Sync Start
(Hsyncstart)
Identifies the pixel clock cycle when the horizontal sync pulse begins. Time
delay between beginning of the blanking interval and beginning of the
horizontal sync pulse identifies front porch timing and can be calculated as
[(Hsyncstart) – (Hdisp)] X [1/(Pclk x 10
6
Hz)].
1776
Horizontal
Sync End
(Hsyncend)
Identifies the pixel clock cycle when the horizontal sync pulse ends. Duration
of sync pulse can be calculated as [(Hsyncend) – (Hsyncstart)] X [1/( Pclk x 10
6
Hz)].
Horizontal
Timing
Parameters
2048
Total
Horizontal Line
Timing (Htotal)
Identifies the pixel clock cycle when the horizontal blanking interval ends.
Time delay between end of horizontal sync pulse and end of blanking interval
identifies back porch timing and can be calculated as [(Htotal) – (Hsyncend)] X
[1/( Pclk x 10
6
Hz)]. The next line of video begins with the next pixel clock
cycle.
1200
Vertical
Display
(Vdisp)
Vdisp indicates the vertical resolution line count of 1200, but may also be
interpreted as a timing factor and used to calculate the time required to draw the
entire visible portion of the display. In this example, there are 1200 visible
horizontal lines, each requiring a total of (Htotal) X [1/( Pclk x 10
6
Hz)] pixel
clock cycles to complete. Time required to draw the visible portion of the
screen can be calculated as (Vdisp) X [(Htotal) X 1/(Pclk x 10
6
)] – in this
example approx. 15.8 ms. The vertical blanking interval begins with the next
line after the visible display is completed.
1202
Vertical Sync
Start
(Vsyncstart)
Identifies the horizontal line on which the vertical sync pulse begins. Time
delay between beginning of the blanking interval and beginning of the vertical
sync pulse identifies vertical front porch timing.
1205
Vertical Sync
End
(Vsyncend)
Identifies the horizontal line on which the vertical sync pulse ends. Duration of
sync pulse (in terms of horizontal lines) can be calculated as (Vsyncend) –
(Vsyncstart).
Vertical
Timing
Parameters
1263
Total Vertical
Lines (Vtotal)
Identifies the horizontal line on which the vertical blanking interval ends. Time
delay between end of vertical sync pulse and end of blanking interval identifies
vertical back porch timing.
HSync
Horizontal
Sync
Specifies polarity of the horizontal sync pulse: positive (+Hsync) or negative (-
Hsync).
VSync
Vertical Sync
Specifies polarity of the vertical sync pulse: positive (+Vsync) or negative (-
Vsync).
Interlace
Indicates that the mode is interlaced.
DoubleScan
Indicates a mode where each scanline is doubled.
Flags
CSync
Composite
Sync
Indicates the device supports a composite sync signal: Csync denotes composite
sync with no polarity specified, +Csync specifies composite sync with positive
polarity, -Csync specifies composite sync with negative polarity.
Summary of Contents for VIDBLOX 3G-NE RX
Page 57: ......
