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TDP158 Datasheet(PDF) 26 Page - Texas Instruments

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Part No. TDP158
Description  6-Gbps, AC-Coupled to TMDS or HDMI Redriver
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TDP158 Datasheet(HTML) 26 Page - Texas Instruments

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26
TDP158
SLLSEX2 – DECEMBER 2016
www.ti.com
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Copyright © 2016, Texas Instruments Incorporated
Table 3. Receiver EQ Programming and Values (continued)
Global
Independent Lane Control
RX EQ
(dB)
Pin Control (1)
I2C Control
I2C Control (2)
{EQ2,EQ1}
P0_Reg0D[6:3]
D2
P0_Reg4E[3:0]
D1
P0_Reg4E[7:4]
D3
P0_Reg4F[3:0]
CLK(2)(3)
P0_Reg4F[7:4]
12
4’b1010
4’b1010
4’b1010
4’b1010
4’b1010
13
4’b1011
4’b1011
4’b1011
4’b1011
4’b1011
14
4’b1100
4’b1100
4’b1100
4’b1100
4’b1100
14.5
2’b1Z
4’b1101
4’b1101
4’b1101
4’b1101
4’b1101
15
4’b1110
4’b1110
4’b1110
4’b1110
4’b1110
15.5
2’b11
4’b1111
4’b1111
4’b1111
4’b1111
4’b1111
8.3.7 Input Signal Detect Block
When SIG_EN is enabled through I2C the receiver looks for a valid HDMI clock signal input and is fully functional
when a valid signal is detected. If no valid HDMI clock signal is detected, the device enters standby mode waiting
for a valid signal at the clock input. All of the TMDS outputs and IN_D[0:2] are in high-Z status. HDMI signal
detect circuit is default enabled. If there is a loss of signal reg20h[5] can be read to determine if the TDP158 has
not detected a valid signal or not.
8.3.8 Transmitter Impedance Control
HDMI2.0 standard requires a source termination impedance in the 75
Ω to 150Ω range for data rates > 3.4Gbps.
HDMI1.4b requires no source termination but has a provision for using 150
Ω to 300 Ω for higher data rates. The
TDP158 has three termination levels that are selectable using pin 16 when programming through pin strapping or
when using I2C programming through reg0Bh[4:3]. When the TMDS_CLOCK_RATIO_STATUS bit, reg0Bh[1] = 1
theTDP158 automatically turns on the 75
Ω to 150 Ω source termination otherwise the termination must be
selected. See Table 4.
Table 4. Source Termination Control Table
Pin 16
Reg0Bh[4:3]
Source Termination
TERM = L
00
150 Ω ~ 300 Ω
TERM = NC
01
None
10
Automatic set based upon TMDS_CLOCK_RATIO_STATUS bit
TERM = H
11
75 Ω ~ 150 Ω
NOTE
If the TMDS_CLOCK_RATIO_STATUS bit = 1, the TDP158 automatically switches in 75
Ω ~ 150 Ω termination.


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