78P2351
Single Channel
OC-3/ STM1-E/ E4 LIU
PIN DESCRIPTION (continued)
CONTROL PINS (continued)
NAME
PIN
TYPE DESCRIPTION
Advanced Tx Control 1:
Low: Enables fixed LVPECL equalizer at the transmit inputs SIDP/N for
FR4 trace lengths up to 1.5m.
Float: Normal operation
High: Normal operation
1
CIT
CIT
TXOUT1
Advanced Tx Control 0:
Low: Nominal amplitude
Float: 5% amplitude boost
High: 10% amplitude boost
2
TXOUT0
Transmitter Power Down:
12
58
CID
CID
TXPD
SPSL
When high, powers down and tri-states the transmit driver. The transmit
monitor port, if enabled, is also powered down when TXPD is high.
Serial Port Selection:
When high, chip is software controlled through the serial port.
Reference Clock Frequency Selection:
Selects the reference frequency that is supplied at the CKREFP/N pins. Its level
is read in only at power-up or on the rising edge of a reset signal at the PORB
pin.
62
CIT
CKSL
•
•
•
Low: 19.44MHz or 17.408MHz
Float: 77.76MHz
High: 155.52MHz or 139.264MHz
Page: 21 of 42
2006 Teridian Semiconductor Corporation
Rev. 2.4
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
