CHAPTER 2 PIN FUNCTION
PRELIMINARY
NEC confidential and Proprietary
17
2.2 Pin
Function
2.2.1 Line
Interface
The line interface connects with an optical transceiver.
(1/2)
Pin Name
Serial No.
Address No.
I/O Level
Function
TDOT0-3
TDOC0-3
O
2.5V
Differential
PECL
Transmit serial data output pins.
Transmit data is output from these pins.
RFCKPLT
RFCKPLC
I
2.5V
Differential
PECL
The differential reference clock inputs.
Inputs the reference clock for both the CDR and the
synthesizer PLL circuits. RFCKPLT must be connected to
a logic one and RFCKPLC to a logic zero state when
RFCKTTL is used.
RFCKTTL
I
LVTTL
TTL reference clock input.
TTL reference clock inputs for both the CDR and the
TxPLL circuits. RFCKTTL must be tied high if RFCKPLT/
RFCKLC is used.
LPFP
Analog
Loop Filter Capacitor for synthesizer PLL.
The TxPLL loop filter capacitor is connected to this pin.
LPFPGND
Analog
Loop Filter Capacitor for synthesizer PLL. (GND)
The TxPLL loop filter capacitor is connected to this pin.
BIASP
Analog
Bias pin for TxPLL
Connects to analog VDD via 1.1K
Ω
register
Содержание UPD98413
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