LMH0387SL Datasheet, PDF (17/23 Pages) Texas Instruments – LMH0387 3 Gbps HD/SD SDI Configurable I/O Adaptive Cable Equalizer / Cable Driver

LMH0387
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SNLS315G – APRIL 2010 – REVISED APRIL 2013
Table 1. SPI Registers (continued)
R/W Name
R/W Launch Amplitude
Bits Field
7 Coarse Control
Default
0
6:3 Fine Control
0000
2:0 Reserved
000
R CLI
7:3 CLI
2:0 Reserved
000
Description
Coarse launch amplitude
optimization for equalizer input.
0: Normal optimization with no
external attenuation (800 mV_P-P
launch amplitude).
1: Optimized for 6 dB external
attenuation (400 mV_P-P launch
amplitude).
Launch amplitude optimization
fine tuning for equalizer input.
0000: +20% from nominal.
0001: +16% from nominal.
0010: +12% from nominal.
0011: +9% from nominal.
0100: +6% from nominal.
0101: +3% from nominal.
0110: Nominal. (The default
setting must be changed to this
nominal setting for most
applications).
0111: -2% from nominal.
1001: +24% from nominal.
1010: +29% from nominal.
1011: +34% from nominal.
1100: +40% from nominal.
1101: +46% from nominal.
1110: +53% from nominal.
1111: +60% from nominal.
1000: Reserved.
Reserved as 000. Always write
000 to these bits.
Cable Length Indicator.
Provides an indication of the
length of cable attached to the
equalizer input. CLI increases
as the cable length increases.
Reserved.
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