Data Display Channel Interface - 1.2 English

HDMI 2.1 Transmitter Subsystem Product Guide (PG350)

Document ID
PG350
Release Date
2022-04-27
Version
1.2 English

The subsystem allows the end-user to build an HDMI 2.1 source device, which negotiates with the targeted HDMI sink device for supported features and capabilities. The communication between the source device(s) and the sink device is implemented through the DDC lines, which is an I2C bus included on the HDMI cable.

The following table shows the Data Display Channel interface signals.

Table 1. Data Display Channel (DDC) Interface
Name I/O Width Description
ddc_scl_i I 1 DDC serial clock in
ddc_scl_o O 1 DDC serial clock out
ddc_scl_t O 1 DDC serial clock tri-state
ddc_sda_i I 1 DDC serial data in
ddc_sda_o O 1 DDC serial data out
ddc_sda_t O 1 DDC serial data tri-state