78P2351
Single Channel
OC-3/ STM1-E/ E4 LIU
PIN DESCRIPTION (continued)
SERIAL-PORT PINS
NAME
PIN TYPE DESCRIPTION
[SPSL=1] Serial-Port Enable:
High during read and write operations. Low disables the serial port.
While SEN is low, SDO remains in high impedance state, and SDI and
SCK activities are ignored.
SEN_CMI
72
73
71
70
CIU
CIS
CI
[SPSL=0] Medium Select:
Low: Fiber (NRZ pass-through) mode
High: CMI mode
[SPSL=1] Serial Clock:
Controls the timing of SDI and SDO.
[SPSL=0] Receive Monitor Mode Enable:
SCK_MON
SDI_PAR
SDO_E4
When high, adds 20dB of flat gain to the incoming signal before
equalization. Rx Monitor mode is only available in CMI mode.
[SPSL=1] Serial Data Input:
Inputs mode and address information. Also inputs register data during
a Write operation. Both address and data are input least significant bit
first.
[SPSL=0] Data Width Select:
Selects 4 bit parallel transmit modes (input high) or serial transmit
modes (input low)
[SPSL=1] Serial Data Output:
Outputs register information during a Read operation. Data is output
COZ/
CI
least significant bit first
[SPSL=0] Rate Select:
Selects E4 operation (input high) or STM1/STS3 operation (input low)
POWER AND GROUND PINS
It is recommended that all supply pins be connected to a single power supply plane and all ground pins be
connected to a single ground plane. See application note for decoupling guidelines.
NAME
PIN
TYPE DESCRIPTION
3, 10, 16, 56, 66, 69, 76,
80, 88, 92, 98
31, 35, 39, 43
4, 11, 17, 55, 65, 68, 77,
84, 85, 86, 87, 89, 95
VCC
VDD
GND
VSS
S
S
Power Supply
CMOS I/O Driver Supply
Ground
G
G
30, 34, 38, 42
CMOS I/O Driver Ground
Trim Ground
Used during production test. Connect directly to ground.
Do not decouple to supply or PORB.
TGND
63
G
Page: 22 of 42
2006 Teridian Semiconductor Corporation
Rev. 2.4
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
