DVI-I Connector Vertical Sync Pin Assignment

This guide details the vertical sync pin configuration on a DVI-I (Digital Visual Interface - Integrated) connector. It covers the exact physical pin assigned to analog vertical synchronization, how digital synchronization is handled, and the surrounding pin architecture.

Analog Vertical Sync: Pin 8

On a standard DVI-I connector, the dedicated Analog Vertical Sync signal is assigned to Pin 8.

DVI-I is designed to carry both digital (TMDS) and legacy analog (VGA-compatible) signals within the same connector housing. While the analog color channels reside in the separate micro-cross cluster on the side of the connector, the sync signals are split between the main pin grid and the cross cluster.

• Pin 8: Analog Vertical Sync
• Pin C4: Analog Horizontal Sync
• Pin C5: Analog Ground (Return for RGB signals)
• Pin 6 & 7: DDC Clock and DDC Data (used for display identification)

Pin 8 carries a standard TTL-level vertical synchronization signal, typically pulsing at the display's vertical refresh rate (e.g., 60 Hz, 75 Hz, or 120 Hz) to signal the start of a new frame.

Digital Vertical Sync Handling

If you are using the digital transmission capabilities of a DVI-I connector, there is no physical, dedicated vertical sync pin.

Instead, digital synchronization signals—both horizontal and vertical sync—are multiplexed directly into the TMDS Data 2- / Data 2+ (Channel 0) stream. These sync pulses are encoded as specific control characters transmitted during the video blanking interval across Pin 17 (TMDS Data 0-) and Pin 18 (TMDS Data 0+).