Datasheet

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SLK2721
SLLS532B – JUNE 2002 – REVISED MARCH 2007
TERMINAL FUNCTIONS (continued)
TERMINAL
TYPE DESCRIPTION
NAME NO.
PRBSEN 41 TTL input (with PRBS testing enable. When this pin is asserted high, the device is put into the PRBS
pulldown) testing mode.
PRBSPASS 42 TTL output PRBS test result. This pin reports the status of the PRBS test results (high = pass).
When PRBSEN is disabled, the PRBSPASS pin is set low. When PRBSEN is enabled
and a valid PRBS is received, then the PRBSPASS pin is set high.
PRE1 4 TTL input (with Programmable de-emphasis control. Combinations of these two bits can be used to
PRE2 5 pulldown) optimize serial data transmission.
PS 21 TTL input (with Polarity select. This pin, used with the SIGDET pin, sets the polarity of SIGSET. When
pulldown) high, SIGDET is an active low signal. When low, SIGDET is an active high signal.
RATEOUT0 37 TTL output Autorate detection outputs. When AUTO_DETECT is high, the autodetection circuit
RATEOUT1 36 generates these two bits to indicate the data rates for the downstream device.
RESET 48 TTL input (with TXFIFO and LOL reset pin. Low is reset and high is normal operation.
pulldown)
RLOOP 54 TTL input (with Remote loopback enable. When this pin is high, the serial input is internally looped back
pulldown) to its serial output with the timing extracted from the serial data.
RSEL0 39 TTL input (with Data rate configuration pins. Put the device under one of the four data rate operations:
RSE1L 38 pulldown) OC-48, OC-24, OC-12, or OC-3.
RX_MONITOR 47 TTL input (with RX parallel data monitor in repeater mode. This pin is only used when the device is put
pulldown) under repeater mode. When high, the RX demultiplexer circuit is enabled and the
parallel data is presented. When low, the demultiplexer is shut down to save power.
SIGDET 20 TTL input (with Signal detect. This pin is generally connected to the output of an optical receiver. This
pulldown) signal may be active high or active low depending on the optical receiver. The SIGDET
input is XORed with the PS pin to select the active state. When SIGDET is in the
inactive state, data is processed normally. When activated, indicating a loss of signal
event, the transmitter transmits all zeroes and force the LOS signal to go high.
SPILL 49 TTL output TX FIFO collision output
TESTEN 43 TTL input (with Production test mode enable. This pin must be left unconnected or tied low.
pulldown)
VOLTAGE SUPPLY AND RESERVED PINS
GND 1, 6, 19, Ground Digital logic ground
23, 26, 28,
30, 31, 33,
40
GNDA 10, 13 Ground Analog ground
GNDLVDS 61, 69, 76, Ground LVDS ground
77, 89, 93,
96, 100
GNDPLL 12 Supply PLL ground
RSVD 52 Reserved This pin needs to be tied to ground or left floating for normal operation.
V
DD
3, 22, 25, Supply Digital logic supply voltage (2.5 V)
29, 32, 35,
50
V
DDA
7, 16 Supply Analog voltage supply (2.5 V)
VDDLVDS 62, 72, 75, Supply LVDS supply voltage (2.5 V)
78, 90–92,
97
VDDPLL 11 Supply PLL voltage supply (2.5 V)
5
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