JAJSOZ7A August 2022 – April 2024 TMDS1204
PRODUCTION DATA
The TMDS1204 transmitter swing level can be adjusted in both pin strap and I2C mode. In I2C mode, TX swing settings are controlled independently for each lane (both clock and data) through registers.
In I2C mode, the TX swing used when operating in HDMI 1.4 and HDMI 2.0 can be independently controlled through HDMI14_VOD and HDMI20_VOD registers.
Table 7-17 lists how the TXSWG pin adjusts the default 1000mV swing in pin strap mode with limited redeliver mode enabled. In HDMI 1.4 the TXSWG controls the swing for both the data and clock lanes. In HDMI 2.0, the TXSWG pin controls the data lanes while the clock lane will remain at the default value. In HDMI 2.1, the TXSWG pin controls data and clock lanes.
In pin-strap mode with linear enabled, the linearity range is fixed at the highest level (1200mVpp) and therefore TXSWG pin is not used. In I2C mode, the linearity range can be adjusted from a register.
TXSWG pin | Limited Mode for HDMI 1.4 | Limited Mode for HDMI 2.0 | Limited Mode for HDMI 2.1 | Linear Mode |
---|---|---|---|---|
0 | Default (1000mVpp) | Default (1000mVpp) | Default + 10% | 1200mVpp |
R | Default − 5% | Default − 5% | Default − 5% | 1200mVpp |
F | Default (1000mVpp) | Default (1000mVpp) | Default (1000mVpp) | 1200mVpp |
1 | Default (1000mVpp) | Default + 5% | Default + 5% | 1200mVpp |