![]() ![]() On laptop computers or other small devices, a mini-VGA port is sometimes used in place of the full-sized VGA connector.ĭE-15 is also conventionally called RGB connector, D-sub 15, mini sub D15, mini D15, DB-15, HDB-15, HD-15 or HD15 (High Density, to distinguish it from the older and less flexible DE-9 connector used on some older VGA cards, which has the same shell size but only two rows of pins). The 15-pin VGA connector is found on many video cards, computer monitors, and high definition television sets. "A Video Graphics Array (VGA) connector is a three-row 15-pin DE-15 connector. New VGA plug-and-play monitors communicate with the computer according to VESA DDC standard.This pinout diagram example showing a VGA connector (as viewed from the socket) was redesigned from the Wikimedia Commons file: DE15 Connector Pinout.svg. This monitor type detection is becoming more and more obsolete nowadays. VGA pinout : monitor ID detection pin assignments E-DDC Version 1.2, approved in 2007, introduced support for DisplayPort and DisplayID standards Version 1 was introduced in 1999 and featured up to 32 Kbytes of display information storage for use by the Enhanced EDID (E-EDID) standard. Because this access is always a read, the first I☬ octet will always be A1h.Į-DDC (Enhanced Display Data Channel) is the most recent revision of the DDC standard. The monitor acts as a slave device at the 7-bit I☬ address 50h, and provides 128-256 bytes of read-only EDID. DDC2B bus is unidirectional and allows only one bus master - the graphics adapter. Monitor must provide 47 kohm pull-up on SCLK line. The computer provides 15 kohm pull-up for the SDA and SCLK lines. The signals in the data bus are standard I2C signals. The bidirectional data bus is a synchronous data bus similar to Access Bus and is based on I2C technology. Vertical sync pulse frequency can be increased up to 25 KHz for the time of the data transfer if a DDC1 compliant monitor is found (be sure not to send those high frequencies to non DDC1 monitors!).ĭDC2 (DDC2B) allows bidirectional communication: monitor can tell its parameters and the computer can adjust monitor settings. When the VGA graphics card detects data on data-line it starts to read the data coming from the monitor synchronous to vertical sync pulse. The DDC standard has been superseded by E-DDC in 1999. Extended display identification data (EDID) is a companion standard it defines a compact binary file format describing the monitor's capabilities and supported graphics modes, stored in a read-only memory (EEPROM) chip programmed by the manufacturer of the monitor.ĭDC1 allows the monitor to tell its parameters to the computer. ![]() DDC version 3, 1997, introduced the DDC2Bi protocol and support for VESA Plug and Display and Flat Panel Display Interface on separate device addresses. DDC version 2, introduced in 1996, split EDID into a separate standard and introduced the DDC2B+ protocol. It included the EDID 1.0 format and specified DDC1, DDC2B and DDC2Ab physical links. The first version of the DDC standard was adopted in August 1994. VESA Display Data Channel is a method for integrating digital interface to VGA connector so as to enable the monitor and graphics card to communicate. 75 ohm double-terminated impedance (18.7 mA – 13 mW).Packed-pixel mode: 256 colors (Mode 13h).Planar mode: up to 16 colors (4 bit planes).Selectable 25.175 MHz or 28.322 MHz master clock. ![]()
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