這是一年前我在公司內(nèi)部博客上記錄的一文，最初的出處我實在是不記得了。sorry~

VGA timing information

This documents tries to collect together information about standard VGA card timing details.

Information form HP monitor manual

Horizonal Timing

Horizonal Dots? ?? ?? ?640? ???640? ???640? ?? ???
Vertical Scan Lines? ? 350? ???400? ???480
Horiz. Sync Polarity? ?POS? ???NEG? ???NEG
A (us)? ?? ?? ?? ?? ???31.77? ?31.77? ?31.77? ???Scanline time
B (us)? ?? ?? ?? ?? ???3.77? ? 3.77? ? 3.77? ?? ?Sync pulse lenght
C (us)? ?? ?? ?? ?? ???1.89? ? 1.89? ? 1.89? ?? ?Back porch
D (us)? ?? ?? ?? ?? ???25.17? ?25.17? ?25.17? ???Active video time
E (us)? ?? ?? ?? ?? ???0.94? ? 0.94? ? 0.94? ?? ?Front porch

? ?? ?? ?______________________? ?? ?? ? ________
________|? ?? ???VIDEO? ?? ?? ?|________| VIDEO (next line)
? ? |-C-|----------D-----------|-E-|
__? ?______________________________? ?___________
??|_|? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?|_|
??|B|
??|---------------A----------------|
Vertical Timing

Horizonal Dots? ?? ?? ?640? ???640? ???640
Vertical Scan Lines? ? 350? ???400? ???480
Vert. Sync Polarity? ? NEG? ???POS? ???NEG? ?? ?
Vertical Frequency? ???70Hz? ? 70Hz? ? 60Hz
O (ms)? ?? ?? ?? ?? ???14.27? ?14.27? ?16.68? ???Total frame time
P (ms)? ?? ?? ?? ?? ???0.06? ? 0.06? ? 0.06? ?? ?Sync length
Q (ms)? ?? ?? ?? ?? ???1.88? ? 1.08? ? 1.02? ?? ?Back porch
R (ms)? ?? ?? ?? ?? ???11.13? ?12.72? ?15.25? ???Active video time
S (ms)? ?? ?? ?? ?? ???1.2? ???0.41? ? 0.35? ?? ?Front porch

? ?? ?? ?______________________? ?? ?? ? ________
________|? ?? ???VIDEO? ?? ?? ?|________|??VIDEO (next frame)
? ? |-Q-|----------R-----------|-S-|
__? ?______________________________? ?___________
??|_|? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?|_|
??|P|
??|---------------O----------------|
Informations source
HP D1194A Super VGA Display & HP D1195A Erognomic Super VGA Display Installation Guide, Hewlett Packard
"VGA industry standard" 640x480 pixel mode

General characteristics

Clock frequency 25.175 MHz
Line??frequency 31469 Hz
Field frequency 59.94 Hz
One line

??8 pixels front porch
96 pixels horizontal sync
40 pixels back porch
??8 pixels left border
640 pixels video
??8 pixels right border
---
800 pixels total per line
One field

??2 lines front porch
??2 lines vertical sync
25 lines back porch
??8 lines top border
480 lines video
??8 lines bottom border
---
525 lines total per field? ?? ?? ?? ???
Other details

Sync polarity: H negative, V negative
Scan type: non interlaced.
Information source
Article "Re: VGA specifications ,where ?" posted 19 Nov 1997 to sci.electronics.design newsgroup by Jeroen Stessen
More VGA mode information

There are the 3 "standard" VGA modes that each VGA card is supposed to be able to do:
640 x 350 x 70 is compatible with the old EGA mode, but on a VGA display.
640 x 400 x 70 is the MS-DOS text mode (when the computer is booting !).
640 x 480 x 60 is the default Windows(tm) graphics mode (16 colours !).

Their line frequency is exactly twice that of the NTSC television system, or almost twice that of the PAL television system. This makes it fairly easy to implement a VGA input on a television set that uses line doubling for the television signals so the line deflection already runs on 31 kHz.

The following timings come from a list of 82 different computer timings, and by now there will be even more. Some video cards even have variable timing (allowing the user to set width, height and shift...). The only standard is that there is no standard !


"640 x 350 (EGA on VGA)"? ? "640 x 400 VGA text"? ?? ???"VGA industry standard"
Clock frequency 25.175 MHz??Clock frequency 25.175 MHz??Clock frequency 25.175 MHz
Line??frequency 31469 Hz? ? Line??frequency 31469 Hz? ? Line??frequency 31469 Hz
Field frequency 70.086 Hz? ?Field frequency 70.086 Hz? ?Field frequency 59.94 Hz

One line:? ?? ?? ?? ?? ?? ? One line:? ?? ?? ?? ?? ?? ? One line:
??8 pixels front porch? ?? ???8 pixels front porch? ?? ???8 pixels front porch
96 pixels horizontal sync? ?96 pixels horizontal sync? ?96 pixels horizontal sync
40 pixels back porch? ?? ???40 pixels back porch? ?? ???40 pixels back porch
??8 pixels left border? ?? ???8 pixels left border? ?? ???8 pixels left border
640 pixels video? ?? ?? ?? ?640 pixels video? ?? ?? ?? ?640 pixels video
??8 pixels right border? ?? ? 8 pixels right border? ?? ? 8 pixels right border
---? ?? ?? ?? ?? ?? ?? ?? ? ---? ?? ?? ?? ?? ?? ?? ?? ? ---
800 pixels total per line? ?800 pixels total per line? ?800 pixels total per line? ?? ?? ?? ?? ?? ?? ?? ?? ???

One field:? ?? ?? ?? ?? ?? ?One field:? ?? ?? ?? ?? ?? ?One field:
31 lines front porch? ?? ?? ?5 lines front porch? ?? ?? ?2 lines front porch
??2 lines vertical sync? ?? ? 2 lines vertical sync? ?? ? 2 lines vertical sync
54 lines back porch? ?? ?? ?28 lines back porch? ?? ?? ?25 lines back porch
??6 lines top border? ?? ?? ? 7 lines top border? ?? ?? ? 8 lines top border
350 lines video? ?? ?? ?? ? 400 lines video? ?? ?? ?? ? 480 lines video
??6 lines bottom border? ?? ? 7 lines bottom border? ?? ? 8 lines bottom border
---? ?? ?? ?? ?? ?? ?? ?? ? ---? ?? ?? ?? ?? ?? ?? ?? ? ---
449 lines total per field? ?449 lines total per field? ?525 lines total
per field? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ???

Sync polarity: H positive,??Sync polarity: H negative,??Sync polarity: H negative,
? ?? ?? ?? ?? ?V negative? ?? ?? ?? ?? ?? ?V positive? ?? ?? ?? ?? ?? ?V negative
Scan type: non interlaced.??Scan type: non interlaced.??Scan type: non interlaced.? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?
Information source

Jeroen H. Stessen kindly mailed this information for me to be added to this document at November 1997.

SuperVGA timing from NEC monitor manual

Horizontal :
? ?? ?? ?? ?? ? ______________? ?? ?? ?? ?? ???_____________
? ?? ?? ?? ?? ?|? ?? ?? ?? ???|? ?? ?? ?? ?? ?|
_______________|??VIDEO? ?? ? |_______________|??VIDEO (next line)

___________? ?_____________________? ?______________________
? ?? ?? ???|_|? ?? ?? ?? ?? ?? ?? ?|_|
? ?? ?? ?? ?B C <------D-----><-E->
? ?? ?? ?? ?<----------A---------->


Vertical :
? ?? ?? ?? ?? ? ______________? ?? ?? ?? ?? ???_____________
? ?? ?? ?? ?? ?|? ?? ?? ?? ???|? ?? ?? ?? ?? ?|? ?? ?? ???
_______________|??VIDEO? ?? ? |_______________|??VIDEO (next frame)

___________? ?_____________________? ?______________________
? ?? ?? ???|_|? ?? ?? ?? ?? ?? ?? ?|_|
? ?? ?? ?? ?P Q <------R-----><-S->
? ?? ?? ?? ?<----------O---------->
For VESA 800*600 @ 60Hz:

Fh (kHz) :37.88
A??(us)??:26.4
B??(us)??:3.2
C??(us)??:2.2
D??(us)??:20.0
E??(us)??:1.0

Fv (Hz)??:60.32
O??(ms)??:16.579
P??(ms)??:0.106
Q??(ms)??:0.607
R??(ms)??:15.84
S??(ms)??:0.026
Information source
NEC Multisync manual
Necessary timing information about VGA modes

Vertical timing information

Mode name? ?? ?? ? Lines? ?line? ? sync? ?? ?back? ?? ???active? ???front? ???whole frame
? ?? ?? ?? ?? ?? ? Total? ?width? ?pulse? ???porch? ?? ???time? ?? ?porch? ?? ???period
? ?? ?? ?? ?? ?? ?? ?? ?? ?(us)? ?(us)(lin) (us)(lin)??(us)??(lin)??(us)(lin)??(us)??(lin)

VGA 640x480 60Hz? ? 525? ? 31.78? ?63? ?2? ?953? ?30? ?15382??484? ?285? ? 9? ?16683??525? ?? ?
VGA 640x480 72Hz? ? 520? ? 26.41? ?79? ?3? ?686? ?26? ?12782??484? ?184? ? 7? ?13735??520
VGA 720x400 70Hz? ? 449? ? 31.78? ?63? ?2??1016? ?32? ?12839??404? ?349? ?11? ?14268??449
VGA 720x350 70Hz? ? 449? ? 31.78? ?63? ?2??1811? ?57? ?11250??354??1144? ?36? ?14268??449
VGA 800x600 56Hz? ? 625? ? 28.44? ?56? ?1? ?568? ?20? ?17177??604? ?? ?? ?-1*??17775??625
VGA 800x600 60Hz? ? 628? ? 26.40??106? ?4? ?554? ?21? ?15945??604? ?? ?? ?-1*??16579??628
VGA 800x600 72Hz? ? 666? ? 20.80??125? ?6? ?436? ?21? ?12563??604? ?728? ?35? ?13853??666
IBM 640x480 75Hz? ? 525? ? 25.397??51? ?2? ?761? ?30? ?12292??484? ?228? ? 9? ?13333??525
MAC 640x480 66Hz? ? 525? ? 28.57? ?86? ?3??1057? ?37? ?13827??484? ? 28? ? 1? ?14999??525
Notes:
Active area is actually an active area added with 4 overscan border lines (in some other VGA timing tables those border lines are included in back and front porch)
Note than when the active part of VGA page is widened, it passes by the rising edge of the vertical sync signal in some modes (marked with *)

Horizonal timing information


Mode name? ?? ?? ? Pixel? ?? ?sync? ?? ?back??active??front whole line
? ?? ?? ?? ?? ?? ? clock? ?? ?pulse? ???porch??time? ?porch??period
? ?? ?? ?? ?? ?? ? (MHz)? ?(us)??(pix)??(pix)??(pix)??(pix)??(pix)

VGA 640x480 60Hz? ?25.175? ?3.81? ?96? ???45? ? 646? ? 13? ???800
VGA 640x480 72Hz? ?31.5? ???1.27? ?40? ? 125? ? 646? ? 21? ???832
VGA 720x400 70Hz? ?28.322? ?3.81??108? ???51? ? 726? ? 15? ???900
VGA 720x350 70Hz? ?28.322? ?3.81??108? ???51? ? 726? ? 15? ???900
VGA 800x600 56Hz? ?36? ?? ? 2? ?? ?72? ? 125? ? 806? ? 21? ? 1024
VGA 800x600 60Hz? ?40? ?? ? 3.2? ?128? ???85? ? 806? ? 37? ? 1056
VGA 800x600 72Hz? ?50? ?? ? 2.4? ?120? ???61? ? 806? ? 53? ? 1040
IBM 640x480 75Hz? ?31.5? ???3.05? ?96? ???45? ? 646? ? 13? ???800
MAC 640x480 66Hz? ?30.24? ? 2.11? ?64? ???93? ? 646? ? 61? ???864
Notes:
Active area is actually an active area added with 6 overscan border pixels (in some other VGA timing tables those border pixels are included in back and front porch)

Information source
Jere M鋕el� Software design for a video conversion equipment, Master's Thesis, Helsinki University of Technology,23. August 1994, Appendix B.1

Timing used in one VGA monitor tester product

The following timings are used in VTG-KIT VGA monitor tester kit sold my Data Sync Engineering.


Mode? ?? ? Horiz??Vertical??Horiz??Vert??Horiz??HSYNC??Vertical VSYNC
? ?? ?? ???Dots? ?Lines? ???KHz? ? Hz? ? Sync? ?Pol? ? Sync? ???Pol

VGA-480? ???640? ?480? ?? ? 31.5? ?60? ? 3.8 us??-? ?? ?64 us? ? -
VGA-400? ???640? ?400? ?? ? 31.5? ?70? ? 3.8 us??-? ?? ?64 us? ? +
SVGA I? ?? ?800? ?600? ?? ? 35.2? ?56? ? 2.0 us??-? ?? ?57 us? ? -
SVGA II? ???800? ?600? ?? ? 37.8? ?60? ? 3.2 us??+? ???106 us? ? +
SVGA III? ? 800? ?600? ?? ? 48.0? ?72? ? 2.4 us??+? ???125 us? ? +
XGA? ?? ???1024? ?768? ?? ? 48.5? ?60? ? 2.0 us??-? ???124 us? ? -

轉(zhuǎn)載于:https://www.cnblogs.com/armlinux/archive/2010/04/12/2390889.html

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