DS100DF410 Datasheet, PDF (14/43 Pages) Texas Instruments – Low Power 10GbE Quad Channel Retimer

DS100DF410
SNLS399A – JANUARY 2012 – REVISED FEBRUARY 2013
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Reference Clock Out
REFCLK_OUT pin 42 is the reference clock output pin. The DS100DF410 drives a buffered replica of the 25
MHz reference clock input on this output pin. If there are multiple DS100DF410 in the system, the REFCLK_OUT
pin can be directly connected to the REFCLK_IN pin of another DS100DF410 in a daisy chain connection. The
other option is to connect the external 25 MHz oscillator to a clock fanout buffer to distribute the 25 MHz clock to
each DS100DF410, which ensures there is a reference clock for the DS100DF410.
INT
The INT line is an open-drain, 3.3V tolerant, LVCMOS active-low output. The INT lines from multiple
DS100DF410s can be wired together and connected to an external controller.
The DS100DF410 generates an interrupt when it detects a loss of signal after previously detecting the presence
of a signal, or when it detects loss of lock after previously detecting phase lock. These interrupts are always
enabled. In addition, 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 DS100DF410 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 DS100DF410 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 DS100DF410 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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