VGA signal Some resolution parameters (excerpt)

Excerpt from: http://group.chinaaet.com/273/4100029440

VGA interface timing, field synchronization signal VSync at the beginning of each frame (that is, send a full screen image) to produce a fixed-width high pulse, the line synchronization signal HSync at the beginning of each line to produce a fixed-width high pulse, color data at some fixed row and column interchange valid.

As mentioned earlier, we typically drive the generation of a VGA signal with a reference clock, using this reference clock as the time unit to generate the timing.

For a standard VGA display driver with a refresh rate of 60Hz and a resolution of 640x480, if its reference drive clock is 25MHz, its pulse count table is shown below. Note that the column is in rows, and the line is in the base clock period, which is the number of 25MHz clock pulses.

VGA Driver Timing Parameter table

Rows/columns	Sync Pulse	back along Pulse	Display Pulse	Front Pulse	Frame length
Column	2		480	Ten	525
Line			640		,

For a SVGA display driver with a refresh rate of 72Hz and a resolution of 800x600, if its reference drive clock is 50MHz, its count pulse parameter is shown in the table. Note that the column is in rows, and the line is in the base clock period, which is the number of 50MHz clock pulses.

SVGA Drive Timing Parameter table

Rows/columns	Sync Pulse	back along Pulse	Display Pulse	Front Pulse	Frame length
Column	6		+	Notoginseng	666
Line	+		+	"	1040

For a display driver with a refresh rate of 60Hz and a resolution of 1024x768, if its reference drive clock is 65MHz, its count pulse parameter is shown in the table. Note that the column is in rows, and the line is in the base clock period, which is the number of 65MHz clock pulses.

SVGA Drive Timing Parameter table

Rows/columns	Sync Pulse	back along Pulse	Display Pulse	Front Pulse	Frame length
Column	6		768	3	806
Line	136		1024x768		1344

For a display driver with a refresh rate of 60Hz and a resolution of 1280x960, if its reference drive clock is 108MHz, its count pulse parameter is shown in the table. Note that the column is in rows, and the line is in the base clock period, which is the number of 108MHz clock pulses.

SVGA Drive Timing Parameter table

Rows/columns	Sync Pulse	back along Pulse	Display Pulse	Front Pulse	Frame length
Column	3		960	1	+
Line	"	312	1280x720	1800

For a display driver with a refresh rate of 60Hz and a resolution of 1280x1024, if its reference drive clock is 108MHz, its count pulse parameters are shown in the table. Note that the column is in rows, and the line is in the base clock period, which is the number of 108MHz clock pulses.

SVGA Drive Timing Parameter table

TD valign= "Top" width= "Bayi" >

Rows/columns	Sync Pulse	back along Pulse	Display Pulse	Front Pulse	Frame length
Column	3		1024x768	1	1066
Line		248	1280x720	1688

For a display driver with a refresh rate of 60Hz and a resolution of 1920x1080, if its reference drive clock is 130MHz, its count pulse parameter is shown in the table. Note that the column is in rows, and the line is in the base clock period, which is the number of 130MHz clock pulses.

SVGA Drive Timing Parameter table

Rows/Columns	Synchronous pulses	Back-edge pulses	Display Pulse	Front Pulse	Frame length
Column	4	18	1080	3	1105
Yes	12	40	1920	28	2000

VGA signal Some resolution parameters (excerpt)