Generalized Timing Formula
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Generalized Timing Formula is a standard by VESA which defines exact parameters of the component video signal for analogue VGA display interface.
 | This article relies largely or entirely on a single source. (May 2023) |
The video parameters defined by the standard include horizontal blanking (retrace) and vertical blanking intervals, horizontal frequency and vertical frequency (collectively, pixel clock rate or video signal bandwidth), and horizontal/vertical sync polarity. Unlike predefined discrete modes (VESA DMT), any mode in a range can be produced using a formula by GTF.
A GTF-compliant display is expected to calculate the blanking intervals from the signal frequencies, producing a properly centered image. At the same time, a compliant graphics card is expected to use the calculation to produce a signal that will work on the display — either a GTF default formula for then-ordinary CRT displays or via a custom formula provided via Extended Display Identification Data (EDID) signaling.
These parameters are used by the XFree86 Modeline, for example.
This video timing standard is available for free.[1]
History
The standard was adopted in 1999, and was superseded by the Coordinated Video Timings specification in 2002.
References
External links
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