Hdmi - Vsif

The is a critical, yet often overlooked, extension mechanism defined in the HDMI 2.0 and later specifications. It enables the transmission of VESA-defined metadata, particularly DisplayID blocks, over an HDMI link. This paper details the motivation, packet structure, operational principles, and use cases of VSIF HDMI, distinguishing it from legacy EDID and CEA-861 Vendor Specific Data Blocks. Special focus is given to its role in supporting advanced display features like high refresh rates, adaptive sync, and multiple monitor topologies.

| Offset | Field | Size | Value | |--------|-------|------|-------| | 0 | DisplayID Version | 8 bits | 0x10 (v1.0) to 0x13 (v1.3+) | | 1 | DisplayID Length | 8 bits | Total bytes of DisplayID block | | 2-n | DisplayID Data Blocks | Variable | See Section 4 | vsif hdmi

// IEEE OUI for HDMI Forum (used for HDR metadata) // Note: Transmitted LSB first on the wire. #define HDMI_OUI_HF 0xC4, 0x5D, 0xD8 The is a critical, yet often overlooked, extension

: While optional for some devices, it must be sent at least once every two video fields when active to ensure the display (sink) remains synchronized with the special format. Key Capabilities in HDMI Versions Special focus is given to its role in