JAJSOZ7A August 2022 – April 2024 TMDS1204
PRODUCTION DATA
As part of discovery the source reads the sink E-EDID information to understand the sink’s capabilities. Part of this read is HDMI Forum Vendor Specific Data Block (HF-VSDB) located at target address 0xA8. From the LV_DDC_SDA and LV_DDC_SCL pins, the TMDS1204 DDC snoop function will monitor both reads and writes to specific offsets of the Status and Control Data Channel Structure (SCDCS) located within the HF-VSDB. The following SCDCS offsets are monitored: Update Flags at offset 10h, TMDS Configuration at offset 20h, Sink Configuration at offset 31h, Source Test Configuration at offset 35h, and Status Flags located at offsets 41h and 42h. The DDC snoop function resides on the LV_DDC_SDA and LV_DDC_SCL pins.
The TMDS1204 has similar SCDCS registers within its register space. Through TMDS1204 local I2C interface, external microprocessor can control TMDS1204 to perform all the necessary functions required for each HDMI type.