User Guide — EP9134_UG V0.7
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19
3.3.1.2 TMDS Control Register 1
Table 3-3 TMDS Control Register 1
$06
bit
7
6
5
4
3
2
1
0
R
TX_TERM
DPRE_EM
TX_BW
TX_PEAK
CPRE_EM
RX_EQ
RX_BW
RX_TERM
W
Reset:
0
0
0
0
0
0
0
0
TX_TERM — HDMI Transmitter Internal Termination Control
1 = Internal Termination is ON
0 = Internal Termination is OFF
DPRE_EM — HDMI Transmitter Data Channel Pre-emphasis Control
1 = Transmitter Data Channel Pre-emphasis is ON
0 = Transmitter Data Channel Pre-emphasis is OFF
TX_BW — HDMI Transmitter PLL Bandwidth Control
1 = TX PLL Bandwidth is 1MHz
0 = TX PLL Bandwidth is 1.6MHz
TX_PEAK — HDMI Transmitter Active Peaking Control
1 = TX Active Peaking is ON
0 = TX Active Peaking is OFF
CPRE_EM — HDMI Transmitter Clock Channel Pre-emphasis Control
1 = Transmitter Clock Channel Pre-emphasis is ON
0 = Transmitter Clock Channel Pre-emphasis is OFF
RX_EQ — HDMI Receiver Equalizer Bias Current Control
1 = EQ Bias Current is 125uA
0 = EQ Bias Current is 100uA
RX_BW — HDMI Receiver Bandwidth Control
1 = 2MHz
0 = 4MHz
RX_TERM — HDMI Receiver Clock Channel Termination Control
1 = Receiver Clock Channel Termination is 100
:
0 = Receiver Clock Channel Termination is 50
:
This register is recommended to be programmed with the value 0xC0 after the power on sequence if the
expected supported TMDS clock frequency is up to 225MHz (1080p, 12 bits deep color). Also, if long
cable is supported, the recommended setting will be 0xA0. The transmitter will consume more current if
the control bit TX_TERM is set to 1.
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