JAJSOZ7A August 2022 – April 2024 TMDS1204
PRODUCTION DATA
In HDMI 2.1 FRL mode, the TMDS1204 monitors offset 31h, 35h, 41h, and 42h. Each offset contains information that the TMDS1204 uses during FRL link training or during TX compliance testing.
Offset 31h contains FRL lane count (3 or 4 lanes), data rate (3, 6, 8, 10, or 12Gbps), and maximum TXFFE levels supported. TMDS1204 enables the appropriate number of lanes based on the lane count. The TMDS1204 uses the data rate information to determine the duration of the TXFFE de-emphasis. The maximum number of supported TXFFE levels sets the number of TXFFE levels TMDS1204 uses during FRL link training. Table 7-16 lists the TMDS1204 does support all four possible TXFFE levels (TXFFE0 through TXFFE3).
Values snooped from offset 35h is used by TMDS1204 during TX FFE compliance testing.