What Is a VGA Chipset?

VGA (Video Graphics Array) line, including VGA interface and connected cables, but usually refers to VGA interface, also called D-Sub interface. The VGA interface is an interface for outputting analog signals on the graphics card. Although the LCD can directly receive digital signals, many low-end products use the VGA interface in order to match the VGA interface graphics card. The VGA interface is a D-type interface, with a total of 15 pins empty, divided into three rows, five in each row.

Various VGA cables can support multiple resolutions ranging from 320 × 400px @ 70 Hz / 320x480px @ 60 Hz (12.6 MHz

The VGA interface is the most widely used interface type on graphics cards, and most graphics cards have such interfaces. Port has one male and one female \ two males \ two females \ class

The 15 pins of the VGA interface, the corresponding interface is defined as follows, and the VGA connector is shown below.

1 red base color red

2 green color

3 blue base color blue

4

(D15 welding method)

Red wire core pin 1

Shield pin 6 for red wire

Green wire core pin 2

Green wire shield pin 7

Blue wire core pin 3

Blue wire shield pin 8

Black line foot 10

Brown thread pin 11

Yellow thread foot 13

White line foot 14

Outer shield D15 end shell crimp

If there are unmarked interfaces and wires, leave them blank and only solder the above marked interfaces and wires.

The A in VGA refers to "array" rather than "adapter" because it was designed from the beginning as a single integrated chip to replace Motorola 6845 and dozens of discrete logic The chip is an ISA master. This design is used by previous MDA, CGA and EGA. This feature of VGA allows it to be easily embedded into the motherboard of a PC, and only requires additional video memory, oscillator and a RAMDAC to have a display function. IBM's PS / 2 computer series is designed to place VGA on the motherboard.

VGA3 + 6

The specifications of VGA are as follows:

* 256 KiB of Video RAM

* 16-color and 256-color modes

* A total of 262144 colors (6 bits each for red, green, and blue, for a total of (2 ^ 6) ^ 3)

* Selective 25.2 MHz or 28.3 MHz processing frequency

* Up to 720 horizontal pixels

* Up to 480 lines

* Up to 70 Hz update frequency

* Vertical Blanking interrupt (not supported by all cards)

* Flat mode: up to 16 colors (4 bit panel)

* Packed-pixel mode: 256 colors (Mode 13h)

* Ability to smoothly scroll animation faces

* Some "Raster Ops" support

* Barrel shifter

* Support split screen

VGA supports APA (All Points Addressable) mode that can control pixels individually, and also supports letter and number text mode. The standard graphics mode is as follows:

* 640 × 480 × 16 colors

* 640 × 350 × 16 colors

* 320 × 200 × 16 colors

* 320 × 200 × 256 colors (Mode 13h)

It also supports drawing the resolutions of previous specifications in an analog way: EGA, CGA, and MDA.