78P2351R-IMR/F Maxim Integrated Products, 78P2351R-IMR/F Datasheet - Page 6

• Manufacturer Part Number: 78P2351R-IMR/F
• Description: IC LIU NRZ-CMI CONV 155M 56-QFN
• Manufacturer: Maxim Integrated Products

Specifications of 78P2351R-IMR/F

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pulse Amplitude Adjustment
Contact TDK applications for information on user
programmable registers with up to 200mV of
programmable transmit gain.
Transmit Backplane Equalizer
An optional fixed LVPECL equalizer is integrated in
the transmit path for architectures that use LIUs on
active interface cards.
compensate for up to 1.5m of trace and can be
enabled by the TXOUT1 pin or TXEQ bit as follows:
POWER-DOWN FUNCTION
Power-down control is provided to allow the
78P2351R to be shut off.
power-down can be set independently through SW
control.
powering down both the transmitter and receiver.
The transmitter can also be powered down using the
TXPD control pin. The CMI outputs are tri-stated
during
applications.
hardware and software modes.
LOOPBACK MODES
In SW mode, LLBK and RLBK bits in the Signal
Control register are provided to activate the local
and remote analog loopback modes respectively.
In HW mode, the LPBK pin can be used to activate
local and remote analog loopback paths as shown in
the table below.
Page: 6 of 31
TXOUT1 pin
Low
Float
LPBK pin
Note: the 4-wire serial port interface and
configuration registers are not affected by power-
down.
Float
High
Low
transmit
Global power-down is achieved by
Loopback Mode
Normal operation
Remote (analog) Loopback:
Recovered receive clock and data
looped back directly to the transmit
driver. The CMI decoder and most of
transmit path is bypassed (including the
redundant Tx monitor output)
Local (analog) Loopback:
Transmit clock and data looped back to
receiver at the analog media interface.
The TXPD pin is active in both
power-down
TXEQ bit
1
0
The fixed equalizer can
Transmit and receive
for
Tx Equalizer

Disabled
Enabled
redundancy
2006 Teridian Semiconductor Corporation
Line-side
Line-side
In SW mode only, a Full Remote (digital) Loopback
bit FLBK is also available in the Advanced Tx
Control register. This loopback exercises the entire
Rx and Tx paths of the 78P2351 including the Tx
clock recovery unit. As such, the user must enable
either Plesiochronous or Loop-timing transmit modes
to utilize the Full Remote (digital) Loopback.
Figure 5: Remote (Digital) Loopback
Figure 4: Local (analog) Loopback
Figure 3: Remote (analog) Loopback
Adaptive
Eq.
Adaptive
Adaptive
Eq.
Eq.
CDR
CDR
CDR
NRZ to CMI Converter
ENDEC
CMI
ENDEC
ENDEC
CMI
CMI
CDR
CDR
CDR
Serial 155M
Fixed
Eq.
78P2351R
Fixed
Fixed
Eq.
Eq.
Rev. 2.1
TD +
TD -
RD +
RD -
TD +
TD -
TD +
TD -
RD +
RD -
RD +
RD -