DS110RT410 Datasheet, PDF (15/40 Pages) Texas Instruments – DS110RT410 Low Power Multi-Rate Quad Channel Retimer

DS110RT410
www.ti.com
SNLS460 – MAY 2013
The output de-emphasis level of the DS110RT410 can be configured from a nominal setting of 0 dB to a nominal
setting of -12 dB depending upon the application. Larger absolute values of the de-emphasis setting provide
more pre-distortion of the output driver waveform, accentuating the high-frequency components of the output
driver waveform relative to the low-frequency components. Greater values of de-emphasis can compensate for
greater dispersion in the transmission media at the output of the DS110RT410. The output de-emphasis level as
set is the typical value to which the output signal will settle following the de-emphasis pulse interval in dB relative
to the output VOD.
Driver Output Rise/Fall Time
In some applications, a longer rise/fall time for the output signal is desired. This can reduce electromagnetic
interference (EMI) generated by fast switching waveforms. This is necessary in some applications for regulatory
compliance. In others, it can reduce the crosstalk in the system.
The DS110RT410 can be configured to operate with a nominal rise/fall time corresponding to the maximum slew
rate of the output drivers into the load capacitance. Alternatively, the DS110RT410 can be configured to operate
with a slightly greater rise/fall time if desired. For the typical specifications on rise/fall time, see Electrical
Characteristics.
INT
The INT line is an open-drain, 3.3V tolerant, LVCMOS active-low output. The INT lines from multiple
DS110RT410 can be wired together and connected to an external controller.
The Horizontal Eye Opening/Vertical Eye Opening (HEO/VEO) interrupt can be enabled using SMBus control for
each channel independently. This interrupt is disabled by default. The thresholds for horizontal and vertical eye
opening that will trigger the interrupt can be set using the SMBus control for each channel.
If any interrupt occurs, registers in the DS110RT410 latch in information about the event that caused the
interrupt. This can then be read out by the controller over the SMBus.
LOCK_3, LOCK_2, LOCK_1, and LOCK_0
Each channel of the DS110RT410 has an independent lock indication pin. These lock indication pins, LOCK_3,
LOCK_2, LOCK_1, and LOCK_0, are pin 16, pin 21, pin 40, and pin 45 respectively. These pins are shared with
the SMBus address strap lines. After the address values have been latched in on power-up, these lines revert to
their lock indication function.
When the corresponding channel of the DS110RT410 is locked to the incoming data stream, the lock indication
pin goes high. This pin can be used to drive an LED on the board, giving a visual indication of the lock status, or
it can be connected to other circuitry which can interpret the lock status of the channel.
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