28348-DSH-001-B
Mindspeed Technologies™
February
2003
CX28342/3/4/6/8
Dual/Triple/Quad/Hex/Octal-Enhanced
DS3/E3 Framer
The CX28342/3/4/6/8 provides Dual, Triple, Quad, Hex, and Octal DS3/E3
framers designed to support DS3-M13, DS3-C-bit parity, E3-G.751, and
E3-G.832 transmission formats.
The CX28342/3/4/6/8 provides framing recovery for M13, M23, C-bit
parity, G.751, and G.832 formatted signals. A FIFO buffer in the receive
path can be enabled to reduce jitter on the incoming data. The CX28342/
3/4/6/8 devices allow for ease of configuration, while providing
maximum flexibility to support the transmission and recovery of industry
standard formats. It provides a flexible overhead bit generation method in
DS3/E3 modes to source overhead bits on an individual framer.
Functional Block Diagram
NOTE:
The index letter i, appearing in a register’s name, represents the
channel number, one per channel.
RXPOS
RXNEG
LINECK
TXPOS
TXNEG
TCLKO
RXDAT
RXMSY
RXGAPCK
REXTCK
TXDATI
TXCKI
TEXT
TEXTCK
TXSY
TXGAPCK
Channel 2
Framer
Channel 1
Framer
(Typical All Channels)
VCO
RXCKI
Channel 3
Framer
Channel 4
Framer
DTACK
INTR
MOTO
A
ALE
RD
WR
CS
AD
ONESEC
Distinguishing Features
!
Two, three, four, six, eight independent T3/
E3 framers in one package
!
Line coding supported:
" T3-B3ZS, NRZ, AMI
" E3-HDB3, NRZ, AMI
!
Framing supported:
" T3-M13, M23, C-bit parity
" E3-G.751, G.832
!
Inserts and extracts overhead bits
!
Full FEAC and TDL channels support
!
Full Performance Monitoring support per
T1.231
!
Integrated Dejitter FIFO
!
Glueless interfaces to the following
processors:
" Intel: 8051, 8151, 8031, 8751, 8x251
" Motorola: 68000, 68020, 68030, 68302
!
An asynchronous processor interface
!
LIU Interfaces:
" Glueless interface to Conexant’s DS3/E3
LIU (CX2832/3)
" Option for a definition of LIU’s clocks
polarity-sampling edge
!
Power Supplies and Power Consumption
" I/O 3.3 V, input 5 V-tolerant, core 2.5 V
" Requires 3.3 V and 2.5 V power
supplies. Optional 5 V supply required
for 5 V input tolerance
" Low power operation (<200 mW per
port)
Applications
!
Digital Cross-Connect Systems
!
Digital PCM Switches
!
Access Concentrators
!
CSUs
!
ATM Switches
!
Concentrators
!
PBXs
!
Routers
!
Test Equipment
Testing
!
JTAG boundary scan support