XRT83VSH28 Datasheet, PDF (1/74 Pages) Exar Corporation – 8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT

PRELIMINARY
XRT83VSH28
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
AUGUST 2006
REV. P1.0.0
GENERAL DESCRIPTION
The XRT83VSH28 is a fully integrated 8-channel
short-haul line interface unit (LIU) that operates from
a 1.8V and a 3.3V power supply. Using internal
termination, the LIU provides one bill of materials to
operate in E1 75Ω or 120Ω mode with minimum
external components. The LIU features are
programmed through a standard parallel or serial
microprocessor interface. EXAR’s LIU has patented
high impedance circuits that allow the transmitter
outputs and receiver inputs to be high impedance
when experiencing a power failure or when the LIU is
powered off. Key design features within the LIU
optimize 1:1 or 1+1 redundancy and non-intrusive
monitoring applications to ensure reliability without
using relays.
The on-chip clock synthesizer generates an E1 clock
reference.
Additional features include RLOS, a 16-bit LCV
counter for each channel, AIS, QRSS generation/
detection, TAOS, DMO, and diagnostic loopback
modes.
APPLICATIONS
• ISDN Primary Rate Interface
• CSU/DSU E1 Interface
• E1 LAN/WAN Routers
• Public switching Systems and PBX Interfaces
• E1 Multiplexer and Channel Banks
FIGURE 1. BLOCK DIAGRAM OF THE XRT83VSH28 E1 LIU (HOST MODE)
MCLKE1
TPOS_n/ TDATA_n
TNEG_n/ CODES_n
TCLK_n
RCLK_n
RNEG_n/ LCV_n
RPOS_n/ RDATA_n
RLOS_n
HW/ HOST
WR_R/W
RD_ DS
ALE- AS
CS
RDY_ DTACK/ SDO
INT
SER_ PAR
MASTER CLOCK SYNTHESIZER
1 of 8 channels, CHANNEL_n
QRSS
PATTERN
GENERATOR
HDB3/
ENCODER
TX/ RX JITTER
ATTENUATOR
TAOS
TIMING
CONTROL
TX FILTER
& PULSE
SHAPER
DRIVE
MONITOR
LINE
DRIVER
QRSS
DETECTOR
Remote
Loopback
Digital
Loopback
Analog
Loopback
HDB3/
DECODER
TX/ RX JITTER
ATTENUATOR
TIMING &
DATA
RECOVERY
LOS
DETECTOR
AIS
DETECTOR
PEAK
DETECTOR
& SLICER
TEST
MICROPROCESSOR/ SERIAL INTERFACE CONTROLLER
MCLKOUT
D M O_ n
TTIP_n
TRING_n
TXON_n
RTIP_n
RRING_n
ICT
µ PTS1
µ PTS2
D[7:0]
µ PCLK/ SCLK
A[7:0]/ SDI
RESET
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com