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IDT82V2082
DUAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
PIN DESCRIPTION
12
May 4, 2009
RD1/
RDP1
RD2/
RDP2
CV1/
RDN1
CV2/
RDN2
O34
26
33
27
H6
G3
J6
J4
RDn: Receive Data output for Channel 1~2
In single rail mode, this pin outputs NRZ data. The data is decoded according to AMI, HDB3 or B8ZS line code rules.
CVn: Code Violation indication
In single rail mode, the BPV/CV errors in received data stream will be reported by driving the CVn pin to high level for a
full clock cycle. B8ZS/HDB3 line code violation can be indicated if the B8ZS/HDB3 decoder is enabled. When AMI
decoder is selected, bipolar violation will be indicated.
In hardware control mode, the EXZ, BPV/CV errors in received data stream are always monitored by the CVn pin if single
rail mode is chosen.
RDPn/RDNn: Positive/Negative Receive Data output for Channel 1~2
In dual rail mode, these pins output the re-timed NRZ data when CDR is enabled, or directly outputs the raw RZ slicer
data if CDR is bypassed.
Active edge and level select:
Data on RDPn/RDNn or RDn is clocked with either the rising or the falling edge of RCLKn. The active polarity is also
RCLK1
RCLK2
O35
25
G5
J1
RCLKn: Receive Clock output for Channel 1~2
This pin outputs 1.544 MHz for T1/J1 mode or 2.048 MHz for E1 mode receive clock. Under LOS conditions with AIS
enabled (bit AISE=1), RCLKn is derived from MCLK.
In clock recovery mode, this signal provides the clock recovered from the RTIPn/RRINGn signal. The receive data (RDn
in single rail mode or RDPn and RDNn in dual rail mode) is clocked out of the device on the active edge of RCLKn.
If clock recovery is bypassed, RCLKn is the exclusive OR (XOR) output of the dual rail slicer data RDPn and RDNn. This
signal can be used in applications with external clock recovery circuitry.
MCLK
I
30
J5
MCLK: Master Clock input
A built-in clock system that accepts selectable 2.048 MHz reference for E1 operating mode and 1.544 MHz reference for
T1/J1 operating mode. This reference clock is used to generate several internal reference signals:
Timing reference for the integrated clock recovery unit.
Timing reference for the integrated digital jitter attenuator.
Timing reference for microcontroller interface.
Generation of RCLKn signal during a loss of signal condition.
Reference clock to transmit All Ones, all zeros, PRBS/QRSS pattern as well as activate or deactivate Inband
Loopback code if MCLK is selected as the reference clock. Note that for ATAO and AIS, MCLK is always used as
the reference clock.
Reference clock during Transmit All Ones (TAO) condition or sending PRBS/QRSS in hardware control mode.
The loss of MCLK will turn TTIP/TRING into high impedance status.
LOS1
LOS2
O32
28
F4
G4
LOSn: Loss of Signal Output for Channel 1~2
These pins are used to indicate the loss of received signals. When LOSn pin becomes high, it indicates the loss of
received signal in channel n. The LOS pin will become low automatically when valid received signal is detected again.
REF
I
71
A5
REF: reference resister
An external resistor (3k
, 1%) is used to connect this pin to ground to provide a standard reference current for internal
circuit.
Table-1 Pin Description (Continued)
Name
Type
TQFP80
Pin No.
FPBGA81
Pin No.
Description