CONEXANT CN8380

Advance Information
This document contains information on a product under development. The parametric information
contains target parameters that are subject to change.
CN8380
Quad T1/E1 Line Interface
The CN8380 is a fully integrated quad line interface unit for both 1.544 Mbps (T1) and
2.048 Mbps (E1) applications. It is designed to complement T1/E1 framers or operate as
a stand-alone line interface to synchronous or plesiochronous mappers and
multiplexers. The device can be controlled through a host mode serial port or by
hardware mode operation, where device control and status are obtained through
non-multiplexed dedicated pins. Many of these pins are also dedicated to individual
channels for maximum flexibility and for use in redundant systems. Integrated in the
CN8380 device is a clock rate adapter (CLAD), which provides various low-jitter
programmable system clock outputs. The receive section of the CN8380 is designed to
recover encoded signals from lines having up to 12 dB of attenuation. The transmit
section consists of a programmable, precision pulse shaper.
XTIP[1]
XRING[1]
Driver
Clock
and
Data
Recovery
Pulse
Shaping
RLOS
Detect
TAIS
Remote Line Loopback
RRING[1]
Receiver
Local Digital Loopback
RTIP[1]
Local Analog Loopback
Functional Block Diagram
Jitter
Attenuator
ZCS
Decode
ZCS
Decode
RPOSO[1]
RNEGO[1]
RCKO[1]
TPOSI[1]
TNEGI[1]
TCLK[1]
LIU #1
LIU #2
LIU #3
LIU #4
JTAG
Test Port
5
JTAG
Test
Signals
Clock Rate Adapter
Control
47
4
Control and Host
10 MHz Variable 1.544
Alarm Signals Serial
Fixed Reference MHz
Port Reference
2.048 32.768 8 kHz–32 MHz
MHz
MHz
Selectable
Distinguishing Features
• Four T1/E1 short haul line interfaces
in a single chip
• On-chip CLAD /system synchronizer
• Digital (crystal-less) jitter attenuators
selectable for transmitter/receiver on
each line interface
• Meets AT&T pub 62411 jitter specs
• Meets ITU G.703, ETS 300 011
(PSTNX) Connections
• AMI/B8ZS/HDB3 line codes
• Host serial port or hardware only
control modes
• On-chip receive clock recovery
• Common transformers for 120/75 Ω
E1 and 100 Ω T1
• Low-power 3.3 V power supply
• Transmitter performance monitor
• Compatible with latest ANSI, ITU-T,
and ETSI standards
• 128-pin MQFP package
• Remote and local loopbacks
Applications
• SONET/SDH multiplexers
• T3 and E3/E4 (PDH) multiplexers
• ATM multiplexers
• Voice compression and voice
processing equipment
• WAN routers and bridges
• Digital loop carrier terminals (DLC)
• HDSL terminal units
• Remote concentrators
• Central office equipment
• PBXs and rural switches
• PCM/voice channel banks
• Digital access and cross-connect
systems (DACS)
8380_001
Data Sheet
Advance Information
N8380DSA
April 26, 1999
Ordering Information
Model Number
Package
Operating Temperature
CN8380EPF
128-pin MQFP
–40 °C to +85 °C
CN8398EVM
BT00–D660–001
Revision History
Revision
Level
Date
Description
A
Advance
April 26, 1999
Created
Information provided by Conexant Systems, Inc. (Conexant) is believed to be accurate and reliable. However, no responsibility is
assumed by Conexant for its use, nor any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent rights of Conexant other than for circuitry embodied in Conexant
products. Conexant reserves the right to change circuitry at any time without notice. This document is subject to change without
notice.
Conexant and “What’s Next in Communications Technologies” are trademarks of Conexant Systems, Inc.
Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered
trademarks of their respective companies. All other marks mentioned herein are the property of their respective holders.
© 1999 Conexant Systems, Inc.
Printed in U.S.A.
All Rights Reserved
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suggestions via e-mail to Conexant Reader [email protected] Sorry, we can't answer your technical
questions at this address. Please contact your local Conexant sales office or local field applications engineer if you
have technical questions.
N8380DSA
Conexant
Advance Information
CN8398EVM Octal T1/E1 Evaluation Module
Eight RJ48C T1 or E1 Line Connections
CN8380 Quad T1/E1 LIU
Microprocessor
Control
CN8380 Quad T1/E1 LIU
CN8398 Octal T1/E1 Framer
Local PCM Highway (i.e., 2 @ 8192 kbps)
8380_002
Contact a Conexant representative for EVM availability and price.
Detailed Feature Summary
Interface Compatibility
Line Codes
•
•
•
•
T1.102–1993
G.703 at 1.544 or 2.048 Mbps
ITU-T Recommendation I.431
Receive Line Interface
•
•
•
External Termination
Equalizer compensation for – 20 dB
bridged monitor levels
+ 3 dB to –12 dB receiver sensitivity
Bipolar alternate mark inversion line
coding
• Optional zero code suppression:
– Independent transmit and receive
– T1: B8ZS
– E1: HDB3
Pulse shapes for 0–655 ft., in 133 ft.
steps (T1 DSX–1)
• External termination for improved
return loss
• Line driver enable/disable for
protection switching
• Output short circuit protection (for
BABT applications)
•
•
•
Receive or transmit direction
8-, 16-, 32-, 64-, or 128-bit depth
Automatic and manual centering
N8380DSA
Remote loopback towards line
– With or without JAT
– Retains BPV transparency
Local loopback towards system
– Analog line loopback
– Local digital loopback
Simultaneous local and remote line
loopbacks
•
•
Outputs jitter attenuated line rate
clock
– CLK1544 = 1544 k (T1)
– CLK2048 = 2048 k (E1)
CLAD output supports 14 output
clock frequencies: 8 kHz to
32,768 kHz
Conexant
Advance Information
Programmable input timing
reference:
– Receive recovered clock from any
channel
– Internal clock (REFCKI)
– CLADI
Subrate CLADI timing reference:
– Line rate ÷2N, N = 0 to 7
– References as low as 8 kHz
Host Serial Interface
•
•
•
Compatible with existing framers
Compatible with microprocessor
serial ports
Bit rates up to 8 Mbps
In-Service Performance Monitoring
•
Clock Rate Adapter
Jitter Attenuator Elastic Store
•
•
•
•
Loopbacks
Transmit Line Interface
•
•
•
•
Transmit alarm detectors:
– Loss of Transmit Clock (TLOC)
– Transmit Short Circuit (TSHORT)
Receive alarm detectors:
– Loss of Signal (RLOS)
– Loss of Analog Input (RALOS)
– Bipolar/Line Code Violations
Automatic and on-demand transmit
alarms:
– AIS following TLOC
– Automatic AIS clock switching
N8380DSA
Conexant
Advance Information
Table of Contents
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x i
1.0
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2.0
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2
Configuration and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1
2.2.2
2.2.3
2.2.4
2.3
2-3
2-3
2-3
2-4
2-5
2-5
2-5
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
N8380DSA
Hardware Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Host Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Host Serial Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.4.1
Power-on Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.4.2
Hard Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.4.3
Soft Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.3.1.1
Raw Receive Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.3.1.2
Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.3.1.3
Bridge Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.3.1.4
Loss Of Signal Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Clock Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.3.2.1
Phase Lock Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.3.2.2
Jitter Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Receive Jitter Attenuator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
RZCS Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Receive Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.3.5.1
Bipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.3.5.2
Unipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Conexant
Advance Information
v
CN8380
Table of Contents
Quad T1/E1 Line Interface
2.4
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.5
Loopbacks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
2.5.1
2.5.2
2.5.3
Local Analog Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Local Digital Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Remote Line Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.6
Jitter Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
2.7
Clock Rate Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
2.7.1
2.7.2
2.7.3
2.8
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
Test Access Port (JTAG). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
2.8.1
2.8.2
3.0
Transmit Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.4.1.1
Bipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.4.1.2
Unipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
TZCS Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Transmit Jitter Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
All 1s AIS Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Pulse Shaper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.4.6.1
Transmit Termination Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.4.6.2
Output Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Transmitter Output Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.4.7.1
Short Circuit Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.4.7.2
Driver Performance Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Device Identification Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1
Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2
Global Control and Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
00—Device Identification (DID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
01—Global Configuration (GCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
02—CLAD Configuration (CLAD_CR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
03—CLAD Frequency Select (CSEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
04—CLAD Phase Detector Scale Factor (CPHASE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
05—CLAD Test (CTEST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
06—CLAD Status (CSTAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
07—(FREG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
08—(TESTA1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
09—(TESTA2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
0A—(FUSE_CH1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
0B—(FUSE_CH2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
0C—(FUSE_CH3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
0D—(FUSE_CH4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
0E—(FUSE_RES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
0F—(TESTD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
vi
Conexant
Advance Information
N8380DSA
CN8380
Table of Contents
Quad T1/E1 Line Interface
3.3
Per Channel Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
10, 20, 30, 40—Jitter Attenuator Configuration (JAT_CR) . . . . . . . . . . . . . . . . . . . . . . . 3-10
11, 21, 31, 41—Receiver Configuration (RLIU_CR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
12, 22, 32, 42 —Transmitter Configuration (TLIU_CR) . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
13, 23, 33, 43—LIU Control (LIU_CTL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
15, 25, 35, 45—Alarm Status (ALARM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
16, 26, 36, 46—Interrupt Status Register (ISR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
17, 27, 37, 47—Interrupt Enable Register (IER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3.4
Transmitter Shape Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
18 - 1F—Transmit PULSE Shape CONFIGURATION (SHAPE1) . . . . . . . . . . . . . . . . . . . . 3-17
28 - 2F—Transmit PULSE Shape CONFIGURATION (SHAPE2) . . . . . . . . . . . . . . . . . . . . 3-17
38 - 3F—Transmit PULSE Shape CONFIGURATION (SHAPE3) . . . . . . . . . . . . . . . . . . . . 3-17
48 - 4F—Transmit PULSE Shape CONFIGURATION (SHAPE4) . . . . . . . . . . . . . . . . . . . . 3-17
50—(TESTA3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
51—(TESTA4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
4.0
Electrical/Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.3
DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.4
Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.5
AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.6
Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Appendix A: Applicable Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Appendix B: External Component Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Appendix C: Acronym List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
N8380DSA
Conexant
Advance Information
vii
CN8380
Table of Contents
Quad T1/E1 Line Interface
viii
Conexant
Advance Information
N8380DSA
CN8380
List of Figures
Quad T1/E1 Line Interface
List of Figures
Figure 1-1.
Figure 1-2.
Figure 1-3.
Figure 2-1.
Figure 2-2.
Figure 2-3.
Figure 2-4.
Figure 2-5.
Figure 2-6.
Figure 2-7.
Figure 2-8.
Figure 2-9.
Figure 2-10.
Figure 4-1.
Figure 4-2.
Figure 4-3.
Figure 4-4.
Figure 4-5.
Figure 4-6.
Figure 4-7.
Figure 4-8.
Figure 4-9.
Figure 4-10.
Figure B-1.
N8380DSA
CN8380 Pinout Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
CN8380 Logic Diagram (Host Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
CN8380 Logic Diagram (Hardware Mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Detailed Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Host Serial Port Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Receiver Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Raw Mode Receiver Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Transmitter Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Transmit Pulse Shape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Transmit Termination Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Receiver Input Jitter Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Typical JAT Transfer Characteristics with Various JAT Sizes . . . . . . . . . . . . . . . . . . . . . . 2-24
CLAD Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
XOE Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
RESET Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
CLAD Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Receiver Signals Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Transmitter Signals Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Host Serial Port Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Host Serial Port Write Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Host Serial Port Read Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
JTAG Interface Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
128-Pin MQFP Mechanical Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Minimum Hardware Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Conexant
Advance Information
ix
CN8380
List of Figures
Quad T1/E1 Line Interface
x
Conexant
Advance Information
N8380DSA
CN8380
List of Tables
Quad T1/E1 Line Interface
List of Tables
Table 1-1.
Table 2-1.
Table 2-2.
Table 2-3.
Table 2-4.
Table 2-5.
Table 2-6.
Table 2-7.
Table 2-8.
Table 2-9.
Table 2-10.
Table 2-11.
Table 2-12.
Table 2-13.
Table 2-14.
Table 3-1.
Table 3-2.
Table 4-1.
Table 4-2.
Table 4-3.
Table 4-4.
Table 4-5.
Table 4-6.
Table 4-7.
Table 4-8.
Table 4-9.
Table 4-10.
Table 4-11.
Table A-1.
Table B-1.
Table B-2.
N8380DSA
Hardware Signal Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Line Compatible Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Transmitter Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Transmit Pulse Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Transmit Termination Option A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Transmit Termination Option B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Transmit Termination Option C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Transmit Termination Option D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Transmit Termination Option E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Loopback Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
CLAD Outputs and Frequencies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
CLAD Reference Frequencies and Configuration Examples . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
Sample Alternate Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28
JTAG Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Device Identification JTAG Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Transmitter Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
DC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
XOE Timing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
RESET Timing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
CLAD Timing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Receiver Signals Timing Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Transmitter Signals Timing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Host Serial Port Timing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
JTAG Interface Timing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Applicable Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Transformer Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
REFCKI (10 MHz) Crystal Oscillator Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Conexant
Advance Information
ix
CN8380
List of Tables
Quad T1/E1 Line Interface
xii
Conexant
Advance Information
N8380DSA
1
1.0 Pin Descriptions
The CN8380 is packaged in a 128-pin metric quad flat pack (MQFP). A pinout
diagram is illustrated in Figure 1-1. Logic diagrams are illustrated in Figure 1-2
and Figure 1-3. Pin labels and numbers, input/output functions, and descriptions
are provided in Table 1-1.
The following input pins contain an internal pull-up resistor (> 50 kΩ) and
may remain unconnected if unused or if the active high input state is desired:
XOE [1:4]
TAIS [1:4]
RAWMD [1:4]
RLOOP [1:4]
LLOOP [1:4]
HM
UNIPOLAR
JDIR/SCLK
JSEL(2)/SDI
JSEL(1)/CS
JSEL(0)
RESET
HTERM
CLK_POL
PTS(2:0)
TDI
(Unused if JTAG not connected)
TMS
(Disables JTAG if not connected)
TCK
(Unused if JTAG not connected)
TRST
(Unused if JTAG not connected)
N8380DSA
Conexant
Advance Information
1-1
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
104
103
113
112
111
110
109
108
107
106
105
102
101
100
99
98
97
96
95
94
93
92 85
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
CN8380
128-Pin MQFP
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
LEGEND:
[#] - Port Number
(#) - Bit Number
TRST
VAA
GND
RAWMD [4]
RRING [4]
RTIP [4]
VAAT [4]
GNDT [4]
XRING [4]
XTIP [4]
XOE [4]
RAWMD [3]
RRING [3]
RTIP [3]
VAAT [3]
GNDT [3]
XRING [3]
XTIP [3]
XOE [3]
GNDR
VAAR
RAWMD [2]
RRING [2]
RTIP [2]
VAAT [2]
GNDT [2]
XRING [2]
XTIP [2]
XOE [2]
RAWMD [1]
RRING [1]
RTIP [1]
VAAT [1]
GNDT [1]
XRING [1]
XTIP [1]
XOE [1]
HM
JATERR [4]
JATERR [3]
JATERR [2]
JATERR [1] / SDO
JDIR / SCLK
JSEL(2) / SDI
JSEL(1) / CS
JSEL(0)
IRQ
RESET
HTERM
CLK_POL
VSS
VDD
ZCS
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
PTS(2)
PTS(1)
PTS(0)
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
CLADO
VSS
VDD
RNEGO/BPV [4]
RPOSO/RDATO [4]
RCKO [4]
TNEGI [4]
TPOSI/TDATI [4]
TCLK [4]
RNEGO/BPV [3]
RPOSO/RDATO [3]
RCKO [3]
TNEGI [3]
TPOSI/TDATI [3]
TCLK [3]
VSS
VDD
RNEGO/BPV [2]
RPOSO/RDATO [2]
RCKO [2]
TNEGI [2]
TPOSI/TDATI [2]
TCLK [2]
RNEGO/BPV [1]
RPOSO/RDATO [1]
RCKO [1]
TNEGI [1]
TPOSI/TDATI [1]
TCLK [1]
1
2
3
4
5
61
62
63
64
CLADI
VAACL
GNDCL
REFCKI
VSS
VDD
CLK32
CLK1544
CLK2048
127
126
125
124
123
122
121
120
119
118
117
116
115
114
128
TACKI
EACKI
RLOOP [4]
RLOOP [3]
RLOOP [2]
RLOOP [1]
LLOOP [4]
LLOOP [3]
LLOOP [2]
LLOOP [1]
TAIS [4]
TAIS [3]
TAIS [2]
TAIS [1]
UNIPOLAR
VDD
VSS
RLOS [4]
RLOS [3]
RLOS [2]
RLOS [1]
VGG
TCK
TMS
TDI
TDO
Figure 1-1. CN8380 Pinout Diagram
8380_003
1-2
Conexant
Advance Information
N8380DSA
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
Figure 1-2. CN8380 Logic Diagram (Host Mode)
Host Mode
Host
Mode
Hardware
Hardware/Host Mode
Hardware/Host Mode
Hardware Reset
I
Remote Loopback
I
Serial Data In
I
Serial Clock In
I
Serial Data In
Serial Clock In
Serial Chip Select
Serial Chip Select
RESET
I
Local Loopback
Remote Loopback
HM
I
Hardware Reset
Local Loopback
Control
Hardware
Interface
HM
I
I
I
I
I
I
Control
Interface
RESET
IRQ
IRQ
RLOS[1:4]
LLOOP[1:4]
RLOS[1:4]
LLOOP[1:4]
Receive Ring
I
Receive Tip
Receive Ring
I
I
Transmit
Clock
PIO
PIO
Transmit
Clock
Transmit
Positive
RailRail I I
Transmit
Positive
Transmit
Negative
RailRail I I
Transmit
Negative
1544
kHz
AllAll1sOnes
Clock
1544
KHz
Clock I I
2048 kHz All 1s Clock
2048 KHz All Ones Clock I I
Transmit
Output
Enable
Transmit
Output
Enable I I
Transmit
All
Transmit All 1s
Ones I I
Interrupt Request
O
Receive Loss of Signal Status
RLOOP[1:4]
SDI
Serial Port
Serial Port
Interface
Interface
(SERIO)
SDI
SCLK
SCLK
CS
SDO
SDO
O Serial Data Out
O
Serial Data Out
(SERIO)
CS
RCKO[1:4]
(RCVR)
I
O
O Receive Loss of Signal Status
RLOOP[1:4]
Receiver
Receiver
(RCVR)
Receive Tip
O Interrupt Request
RCKO[1:4]
O Receive Clock
O
Receive Clock
RTIP[1:4]
RPOSO[1:4]
O Receive Positive Rail
RRING[1:4]
RNEGO[1:4]
O Receive Negative Rail
RTIP[1:4]
RPOSO[1:4]
RRING[1:4]
RNEGO[1:4]
O
O
Receive Positive Rail
Receive Negative Rail
Transmitter
Transmitter
(XMTR)
TCLK[1:4]
TCLK[1:4]
(XMTR)
XTIP[1:4]
XTIP[1:4]
TPOSI[1:4]
TPOSI[1:4]
TNEGI[1:4]
XRING[1:4]
XRING[1:4]
TNEGI[1:4]
OO Transmit
TransmitTip
Tip
OO Transmit
TransmitRing
Ring
TACKI
TACKI
EACKI
EACKI
XOE[1:4]
XOE[1:4]
TAIS[1:4]
TAIS[1:4]
Clock
Rate
Clock
Rate
Adapter
(CLAD)
Adapter (CLAD)
CLAD
Input
CLAD
Input I I
Reference
Clock I I
Reference
Clock
TCKT C K
Test Mode
Select I I
Test Mode
Select
TMST M S
I
Reset
Test Test
Reset
In In I I
8380_004
N8380DSA
REFCKI
REFCKI
Clock
Test Test
Clock
In In I I
Test Test
DataData
In In I
CLK32
CLK32
CLADI
CLADI
Out
OO 32.768
32.768MHz
MHz Clock
Clock Out
CLK1544
CLK1544
LineRate
Rate Clock
Clock Out
Line
Out
OO T1T1
CLK2048
CLK2048
LineRate
Rate Clock
Clock Out
Line
Out
OO E1E1
CLADO
CLADO
CLADOutput
Output
OO CLAD
TDO
TDO
Test
DataOut
Out
Data
OO Test
Boundary
Scan
Boundary
Scan
(JTAG)
(JTAG)
TDI TDI
TRST
TRST
I = Input,
O = Output
I = Input,
O = Output
= Programmable
PIO =PIO
Programmable
I/O I/O
Conexant
Advance Information
1-3
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
Figure 1-3. CN8380 Logic Diagram (Hardware Mode)
Hardware Mode
Hardware
Control
Interface
VDD
HM
Hardware/Host Mode
Hardware Reset
I
RESET
Jitter Attenuator Path I
JDIR
Jitter Attenuator Size I
JSEL(2:0)
Unipolar/Bipolar
I
UNIPOLAR
HTERM
Transmit Pulse Template I
PTS(2:0)
Clock Polarity
I
IRQ
JATERR[1:4]
Transmitter Termination I
O Jitter Attenuator Error Status
RLOS[1:4]
O Receive Loss of Signal Status
RCKO[1:4]
O Receive Clock
CLK_POL
Raw Mode Select I
RAWMD[1:4]
Local Loopback
I
LLOOP[1:4]
Remote Loopback I
RLOOP[1:4]
Zero Code Suppression I
O Interrupt Request
ZCS
Receiver
(RCVR)
Receive Tip
I
RTIP[1:4]
RPOSO[1:4]
O Receive Positive Rail
Receive Ring
I
RRING[1:4]
RNEGO[1:4]
O Receive Negative Rail
Transmit Clock
I
TCLK[1:4]
Transmitter
(XMTR)
Transmit Negative Rail I
TPOSI[1:4]
TNEGI[1:4]
1544 kHz All 1s Clock I
TACKI
2048 kHz All 1s Clock I
EACKI
Transmit Positive Rail I
Transmit Output Enable I
XOE[1:4]
Transmit All 1s I
TAIS[1:4]
XTIP[1:4]
XRING[1:4]
O Transmit Tip
O Transmit Ring
Clock Rate
Adapter (CLAD)
CLK32
I
CLADI
CLK1544
O T1 Line Rate Clock Out
Reference Clock
I
REFCKI
CLK2048
O E1 Line Rate Clock Out
CLADO
TCK
TMS
Test Data In
I
TDI
Test Reset In
I
TRST
O 8 KHz Clock Out
Boundary Scan
(JTAG)
TDO
I = Input, O = Output
PIO = Programmable I/O
Conexant
Advance Information
O Test Data Out
8380_005
I
Test Mode Select I
Test Clock In
1-4
O 32.768 MHz Clock Out
CLAD Input
N8380DSA
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
Table 1-1. Hardware Signal Definitions (1 of 5)
Pin Label
Signal Name
I/O
Definition
Receiver
O
Line rate data output on the rising or falling edge of RCKO. The clock edge
is determined by the CLK_POL pin in Hardware Mode or the CLK_POL
register bit [RLIU_CR; addr n1] in Host Mode. In bipolar mode, a high
signal indicates receipt of a positive AMI pulse on RTIP/RRING inputs. In
unipolar mode, RPOSO is redefined as RDATO and a high signal indicates
either a positive or negative AMI pulse on RTIP/RRING inputs.
RPOSO/RDATO is three-stated during device reset.
O
Line rate data output on rising or falling edge of RCKO. The clock edge is
determined by the CLK_POL pin in Hardware Mode or the CLK_POL
register bit [RLIU_CR; addr n1] in Host Mode. In bipolar mode, a high
signal indicates receipt of a negative AMI pulse on RTIP/RRING inputs. In
unipolar mode, RNEGO is redefined as BPV, and a high signal indicates the
reception of a BPV which is not part of a ZCS code (B8ZS or HDB3).
RNEGO/BPV is three-stated during device reset.
RX Clock Output
O
Receive clock output. RCKO is the RPLL recovered line rate clock or jitter
attenuated clock output, based on the programmed jitter attenuator
selection. RCKO is three-stated during device reset.
RTIP[1:4]
Receive Tip
I
Differential AMI data inputs for direct connection to receive transformer.
RRING[1:4]
Receive Ring
RPOSO[1:4]
RX Positive Rail
(Bipolar Mode)
RDATO[1:4]
RX Data (Unipolar
Mode)
RNEGO[1:4]
RX Negative Rail
(Bipolar Mode)
BPV[1:4]
Bipolar Violation
(Unipolar Mode)
RCKO[1:4]
Transmitter
TPOSI[1:4]
Tx Positive Rail
(Bipolar Mode)
TDATI[1:4]
Tx Data (Unipolar
Mode)
TNEGI[1:4]
I
Positive rail, line rate data source for transmitted XTIP/XRING output
pulses. Data is sampled on the falling edge of TCLK. In bipolar mode, a
high on TPOSI causes a positive output pulse on XTIP/XRING; and a high
on TNEGI causes a negative output pulse. In unipolar mode, TPOSI is
redefined as TDATI and accepts single-rail NRZ data. TNEGI is not used in
unipolar mode.
Tx Negative Rail
Input
I
Negative rail, line rate data input on TCLK falling edge. Refer to TPOSI
signal definition.
TCLK[1:4]
TX Clock Input
I/O
Transmit line rate clock. TCLK is the transmit clock for TPOSI and TNEGI
data inputs and for transmitter timing. Normally, TCLK is an input and
samples TPOSI/TNEGI on the falling edge. In Host Mode, TCLK can be
configured as an output to supply a line rate transmit clock from the
CLAD. The timing reference for the TCLK output (and CLAD) can be
selected from six sources.
TACKI
T1 AIS Clock
I
EACKI
E1 AIS Clock
I
Alternate T1 and E1 transmit clock used to transmit AIS (all 1s alarm
signal) when the primary transmit clock source, TCLK, fails. TACKI (T1) or
EACKI (E1) is either manually or automatically switched to replace TCLK
[LIU_CTL; addr n3]. Systems without an AIS clock should connect TACKI
and EACKI to ground.
XOE[1:4]
Transmit Output
Enable
IP
A low signal enables XTIP and XRING output drivers. Otherwise outputs
are high impedance.
TAIS[1:4]
Transmit AIS
Alarm
IP
In Hardware Mode, a low signal causes AIS (unframed all 1s)
transmission on XTIP/XRING outputs. In Host Mode, these pins can be
enabled or disabled [LIU_CTL; addr n3]. If disabled, they are not used and
may be left unconnected.
N8380DSA
Conexant
Advance Information
1-5
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
Table 1-1. Hardware Signal Definitions (2 of 5)
Pin Label
Signal Name
XTIP[1:4]
Transmit Tip
XRING[1:4]
Transmit Ring
I/O
Definition
O
Complementary AMI transmitter line outputs for direct connection to
transmit transformer. Optionally, both outputs are three-stated when XOE
is high.
Clock Rate Adapter (CLAD)
CLADI
CLAD Input
I
CLAD input timing reference used to phase/frequency lock the CLAD
outputs to an input clock frequency selected in the range of 8 kHz to
32,768 kHz [CLAD_CR; addr 02]. Systems which do not use CLADI should
connect CLADI to ground. In Hardware Mode, the CLAD timing reference
automatically switches to internal free-run operation if clock edges are not
detected on CLADI pin.
REFCKI
Reference Clock
I
System must apply a 10 MHz ± 50 ppm (E1) or + 32 ppm (T1) clock signal
to act as the frequency reference for the internal numerically controlled
oscillator (NCO). REFCKI determines the frequency accuracy and stability
of the CLAD output clocks when operating in free-run mode [CLAD_CR;
addr 02]. REFCKI is the baseband reference for all CLAD/JAT functions
and is used internally to generate clocks of various frequency locked to a
selected receive or external clock.
Note: REFCKI is always required.
CLK32
32 MHz Clock
Output
O
Fixed rate 32.768 MHz clock output provided by the CLAD. May be used
by framers, such as the CN8398 octal T1/E1 framer, to provide system
timing reference.
CLK1544
T1 Clock Output
O
Fixed rate 1.544 MHz T1 line rate clock output provided by the CLAD. May
be used for TCLK or TACKI clock sources. This clock is locked to the
selected CLAD timing reference.
CLK2048
E1 Clock Output
O
Fixed rate 2.048 MHz E1 line rate clock output provided by the CLAD. May
be used for TCLK or EACKI clock sources. This clock is locked to the
selected CLAD timing reference.
CLADO
CLAD Output
O
In Hardware Mode, CLADO is a fixed rate 8 kHz clock output provided by
the CLAD. In Host Mode, CLADO may be configured to operate at one of
14 different clock frequencies [CSEL; addr 03] that include T1 or E1 line
rates. CLADO is typically programmed to supply system clocks that are
phase-locked to the selected receive or CLAD timing reference [CLAD_CR;
addr 02].
Hardware Control Signals
HM
Hardware Mode
IP
A high on HM places the device in Hardware Mode, enabling all hardware
control pin functions. A low on HM places the device in Host Mode,
disabling some hardware-mode-only pin functions and enabling the serial
port signals on the dual function pins listed below. The serial port signals
allow serial host access to the device registers. Refer to the Host Serial
Control Signals section of this table.
JSEL(1) / CS
JDIR / SCLK
RAWMD[1:4]
1-6
Raw Mode
IP
JSEL(2) / SDI
JATERR(1) / SDO
Low selects receiver Raw mode. Applicable only in Hardware Mode. In
Raw mode, RPOSO and RNEGO represent the data slicer outputs and
RCKO is the logical OR of RPOSO and RNEGO.
Conexant
Advance Information
N8380DSA
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
Table 1-1. Hardware Signal Definitions (3 of 5)
Pin Label
Signal Name
I/O
Definition
RESET
Hardware Reset
IP
Active low asynchronous hardware reset. A falling edge forces registers to
their default, power-up state. Output pins are forced to the high impedance
state while RESET is asserted. RESET is not mandatory at power-up
because an internal power-on reset circuit performs an identical function.
UNIPOLAR
Unipolar Mode
Select
IP
Applicable only in Hardware Mode. A high signal on UNIPOLAR configures
all RPOSO outputs and TPOSI inputs to operate with unipolar, NRZformatted data. In this mode, RNEGO reports non-ZCS BPVs and TNEGI is
not used. A low signal on UNIPOLAR configures all channels’
RPOSO/RNEGO and TPOSI/TNEGI interfaces to operate with bipolar,
dual-rail, NRZ formatted data.
ZCS
Zero Code
Suppression
Select
IP
Applicable only in Hardware Mode. A high signal on ZCS enables the
transmit ZCS encoder and the receive ZCS decoder if unipolar mode is
enabled (UNIPOLAR = 1). In Bipolar Mode (UNIPOLAR = 0), the ZCS
encoder and decoder are disabled and ZCS is ignored.
CLK_POL
Rx Clock Polarity
Select
IP
Applicable only in Hardware Mode. High sets RPOSO/RNEGO to be output
on the falling edge of RCKO. Low sets RPOSO/RNEGO to be output on the
rising edge of RCKO
PTS(2:0)
Transmit Pulse
Template Select
IP
Applicable only in Hardware Mode. The PTS(2:0) control bus selects the
transmit pulse template and the line rate (T1 or E1) globally for all
channels. Refer to the description of HTERM in this table and to the
transmit pulse configurations in Table 2-3.
HTERM
Transmitter
Hardware
Termination
IP
Applicable only in Hardware Mode. If an external transmit termination
resistor is used to meet return loss specifications; a transformer with a 1:2
turns ratio is used, and HTERM is set high to allow the transmitter to
compensate for the increased load. Refer to the Transmitter section of this
table and Tables 2-4 through 2-8 for transmitter termination configuration
options.
IRQ
Interrupt Request
OD
Active low, open drain output. In Host Mode, IRQ indicates one or more
pending interrupt requests ([ISR; addr n6] and [CSTAT; addr 06]). In
Hardware Mode, IRQ is the logical NOR of the four internal transmitter
driver performance monitor outputs.
JSEL(2:0)
Jitter Attenuator
Select
IP
Applicable only in Hardware Mode. The JSEL and JDIR pins determine the
JAT configuration. JSEL(2:0) enables and selects the JAT depth as shown
in the table below. SDI/JSEL(2) and CS /JSEL(1) are dual function pins.
JSEL(2:0)
000
001
010
011
100
111
JAT Mode
8 bits
16 bits
32 bits
64 bits
128 bits
Disable JAT
JDIR
Jitter Attenuator
Direction
IP
Applicable only in Hardware Mode. JDIR determines the path in which the
JAT is inserted. If JDIR is low, the JAT (if enabled) is placed in the receive
path; if high, the JAT (if enabled) is placed in the transmit path. Refer to
the description for JSEL(2:0). SCLK/JDIR is a dual function pin.
JATERR[1:4]
Jitter Attenuator
Error
O
Applicable only in Hardware Mode. A high on JATERR indicates an
overflow or underflow error in the jitter attenuator elastic store.
JATERR(1) / SDO is a dual function pin.
N8380DSA
Conexant
Advance Information
1-7
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
Table 1-1. Hardware Signal Definitions (4 of 5)
Pin Label
Signal Name
I/O
Definition
RLOS [1:4]
Receive Loss of
Signal
O
RLOS is asserted low when 100 (T1) or 32 (E1) consecutive 0s (no
pulses) are received at the line interface or when the received signal level
is approximately 18 dB below nominal for at least 1 ms.
LLOOP [1:4]
Local Loop
IP
RLOOP [1:4]
Remote Loop
IP
These pins are always enabled in Hardware Mode and may be enabled or
disabled in Host Mode [LIU_CTL; addr n3]. A low on LLOOP initiates Local
Analog Loopback and a low on RLOOP initiates Remote Line Loopback.
Local Digital Loopback is initiated if both signals are asserted together.
Boundary Scan Signals (JTAG)
TDO
Test Data Output
O
Test data output per IEEE Std. 1149.1-1990. Three-state output used for
reading all serial configuration and test data from internal test logic.
Updated on the falling edge of TCK.
TDI
Test Data Input
IP
Test data input per IEEE Std. 1149.1-1990. Used for loading all serial
instructions and data into internal test logic. Sampled on the rising edge of
TCK. TDI may be left unconnected if not used.
TMS
Test Mode Select
IP
Active-low test mode select input per IEEE Std 1149.1-1990. Internally
pulled-up input signal used to control the test logic state machine.
Sampled on the rising edge of TCK. TMS may be left unconnected if not
used.
TCK
Test Clock
IP
Test clock input per IEEE Std. 1149.1-1990. Used for all test interface and
internal test-logic operations. If not used, TCK should be pulled low.
TRST
Reset
IP
Active low reset. TRST is pulled up internally and may be left unconnected
if not used.
Host Serial Control Signals
CS
Chip Select
IP
In Host Mode, CS is an active low input used to enable read/write access
with the host serial control port. CS /JSEL(1) is a dual function pin.
SDI
Serial Data In
IP
In Host Mode, SDI is the serial data input for the host serial control port.
SDI/JSEL(2) is a dual function pin.
SDO
Serial Data Out
O
In Host Mode, SDO is the serial data output for the host serial control port.
SDO/JATERR[1] is a dual function pin.
SCLK
Serial Clock
IP
In Host Mode, SCLK is the serial clock input for the host serial control
port. SCLK/JDIR is a dual function pin.
Power Supply Pins and No-Connect Pins
VAA
Analog Supply
GND
Ground
VAAT[1:4]
Tx Driver Supply
GNDT[1:4]
Ground
VAAR
Rx Analog Supply
GNDR
Ground
1-8
I
+3.3 V + 5%. Power supply pair for the analog circuitry.
I
+3.3 V + 5%. Power supply pairs for the transmitter driver circuitry. These
pin pairs should each be bypassed with a tantalum capacitor value of at
least 10 µF.
I
+ 3.3 V + 5%. Power supply pair for the analog receiver circuitry.
Conexant
Advance Information
N8380DSA
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
Table 1-1. Hardware Signal Definitions (5 of 5)
Pin Label
Signal Name
VAACL
CLAD Supply
GNDCL
Ground
VDD
Digital Supply
VSS
Ground
VGG
ESD Rail
N.C.
No Connect
I/O
Definition
I
+ 3.3 V + 5%. Power supply pair for the CLAD PLL circuitry.
I
+ 3.3 V + 5%. Power supply pairs for the digital circuitry.
I
To insure 5 V tolerance in mixed + 5 V / + 3.3 V systems, this input must
be connected to + 5 V. If all logic input signals are 3.3 V levels, then this
pin may be connected to the 3.3 V supply.
—
No-connect pins are reserved for future device compatibility and should
be left unconnected.
NOTE(S):
1. I/O Types:
I = Standard input
IP = Input with internal pull-up resister
O = Standard output
OD = Output with open drain
2. Legend:
[#] = Port number
(#) = Bit number
N8380DSA
Conexant
Advance Information
1-9
CN8380
1.0 Pin Descriptions
Quad T1/E1 Line Interface
1-10
Conexant
Advance Information
N8380DSA
2
2.0 Circuit Description
2.1 Overview
The CN8380 includes four identical T1/E1 transceiver channels and a common
CLAD packaged in a 128-pin MQFP carrier. It is designed to interface T1/E1
framers, or to operate as a stand-alone line interface for synchronous or
plesiochronous mappers and multiplexers. The CN8380 is ideal for high line
density, short-haul applications that require low power (3.3 V supply) operation.
The configurable T1/E1 operation and common line interface design allows
support for single-board T1 and E1 designs.
Customer premise applications are supported by an on-chip JAT which
conforms to AT&T PUB 62411 and a selectable transmit pulse shape which
conforms to FCC Part 68, Pulse Option A. Selectable unipolar or bipolar interface
options and internal ZCS encoding and decoding are useful in many multiplexer
and mapper applications.
In the most simple configuration, Hardware Mode, the device is controlled
using dedicated hardware control pins. In this mode, the four channels are
configured globally to identical operating modes (T1, E1, transmit termination,
jitter attenuators, and so on). Each channel has device pins dedicated for channel
control and status, such as loopback controls, bipolar/unipolar interface modes,
and loss of signal indicators. Hardware Mode is selected by pulling the HM pin
high.
Host Mode allows control of the device through a 4-line serial port. In this
mode, all control and status functions can be accessed using internal registers.
Several additional features are also available in Host Mode, such as individual
channel operating mode configuration (T1/E1, transmit termination, jitter
attenuators, etc.) and programmable CLAD output frequencies. Host Mode is
selected by grounding the HM pin.
The CN8380 incorporates printed circuit board testability circuits in
compliance with IEEE Std P1149.1a–1993, IEEE Standard Test Access Port and
Boundary–Scan Architecture, commonly known as JTAG (Joint Test Action
Group). A detailed block diagram is displayed in Figure 2-1.
N8380DSA
Conexant
Advance Information
2-1
2-2
Advance Information
Conexant
Short
CKT
Detect
DPM
DAC
VGA
Pulse
Shape
8X
TPLL
TAIS[n]
AIS
Gen
Peak
Detect
and
Slicer
Clock
Recovery
RPLL
TDI TDO
Clock
Mon
Local
Digital
Loopback
RLOS
Detect
0
1
1
0
RLOOP[n]
RCKO[1]
RCKO[2]
RCKO[3]
RCKO[4]
Jitter Attenuator
TMS TCLK TRST
JTAG
Control
0
1
0
1
Control
SDO
SDI
CS
SCLK
RLOS[n] JATERR[n] JATERR[1] JSEL(2) JSEL(1) JSEL(0) JDIR
Adaptive
Equalizer
RAWMD[n]
HM XOE[n] HTERM PTS(2:0)
DRV
Local
Analog
Loopback
1
0
IRQ
Phase
Detector
CLK_POL
CLAD
NCO
TZCS
Encode
Divider
Chain
Note:
Only one LUI is
shown. The other
three are identical.
RZCS
Decode
UNIPOLAR
Remote
Line
Loopback
ZCS
CLK32 (32.768 MHz)
CLK2048 (2.048 MHz)
CLK1544 (1.544 MHz)
CLADO
CLADI
REFCKI
TACKI
EACKI
TPOSI[n]
TNEGI[n]
TCLK[n]
RPOSO[n]
RNEGO[n]
RCKO[n]
2.1 Overview
8380_006
XTIP[n]
XRING[n]
RTIP[n]
RRING[n]
LLOOP[n]
2.0 Circuit Description
CN8380
Quad T1/E1 Line Interface
Figure 2-1. Detailed Block Diagram
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.2 Configuration and Control
2.2 Configuration and Control
2.2.1 Hardware Mode
In Hardware Mode, the device is controlled using dedicated hardware control
pins. In this mode, the four channels are configured globally to identical
operating modes (T1, E1, transmit termination, jitter attenuators, and so on). Each
channel has device pins dedicated for channel control and status, such as
loopback controls, bipolar/unipolar interface modes, and loss of signal indicators.
Refer to Table 1-1, Hardware Signal Definitions, for a description of all hardware
pins. Hardware Mode is selected by pulling the HM pin high.
2.2.2 Host Mode
In Host Mode, control of the device is through a four-line serial port. In this
mode, all control and status functions can be accessed using internal registers.
Refer to Chapter 3.0, Registers, for a description of each register. Host Mode is
selected by grounding the HM pin.
2.2.3 Host Serial Control Interface
The CN8380 serial interface is a four-wire, slave interface which allows a host
processor or framer with a compatible master serial port to communicate with the
LIU. This interface allows the host to control and query the CN8380 status by
writing and reading internal registers. One 8-bit register in the LIU can be written
via the SDI pin or read from the SDO pin at the clock rate determined by SCLK.
The serial port is enabled by pulling the chip select pin, CS, active (low) during
the read and write cycles. Refer to Figure 2-2 for host serial port signals.
The serial interface uses a 16-bit process for each write or read operation.
During a write or read operation, an 8-bit control word, consisting of a read/write
control bit (R/W) and a 7-bit LIU register address (A[6:0]) is transmitted to the
LIU using the SDI pin. If the operation is a write operation (R/W = 0), an 8-bit
register data (D[7:0]) byte follows the address on the SDI pin. This data is
received by the CN8380 and stored in the addressed register. If the operation is a
read operation (R/W = 1), the CN8380 outputs the addressed register contents on
the SDO pin. The signal input on SDI is sampled on the SCLK falling edge, and
data output on SDO changes on the SCLK rising edge.
N8380DSA
Conexant
Advance Information
2-3
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.2 Configuration and Control
Figure 2-2. Host Serial Port Signals
Read Timing
CS
SCLK
SDI
R/W A0
A1
A2
A3
A4
A5
A6
Address/Control Byte
D0
SDO
D1
D2
D3
D4
D5
D6
D7
D6
D7
Register Data Byte
Write Timing
CS
SCLK
SDI
R/W A0
A1
A2
A3
A4
A5
A6
D0
D1
Address/Control Byte
D2
D3
D4
D5
Register Data Byte
SDO
8380_007
2.2.4 Reset
The CN8380 supports three reset methods: power-on reset, hard reset initiated by
the RESET pin, and soft reset initiated by the RESET bit in the Global
Configuration Register [GCR; addr 01]. In Host Mode, all three reset methods
produce the same results as listed below. In Hardware Mode, power-on reset and
hard reset produce the same results as shown; and soft reset is not applicable.
After RESET is complete, the following is true:
2-4
Hardware Mode
Digital receiver outputs
(RPOSO[1:4] and RNEGO[1:4],
RCKO[1:4]) are enabled.
Host Mode
Digital receiver outputs (RPOSO[1:4]
and RNEGO[1:4], RCKO[1:4]) are
three-stated.
Transmitter line outputs (XTIP[1:4]
and XRING[1:4]) are enabled
(controlled by XOE).
Transmitter line outputs (XTIP[1:4]
and XRING[1:4]) are three-stated.
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.2 Configuration and Control
Hardware Mode
CLK1544, CLK2048, and CLADO
clock outputs are enabled.
Host Mode
CLK1544, CLK2048, and CLADO
clock outputs are three-stated.
Transmitter clocks, TCLK[1:4], are
configured as inputs.
Transmitter clocks, TCLK[1:4], are
configured as inputs.
The IRQ pin is enabled (controlled
by DPM).
The IRQ pin is three-stated.
All interrupt sources are disabled.
All configuration registers are set to
default values as listed in Section 3.1,
Address Map.
2.2.4.1 Power-on Reset
An internal power-on reset process is initiated during power-up. When VDD has
reached approximately 2.6 V, the internal reset process begins and continues for
300 ms maximum if REFCLK is applied. If REFCLK is not present, the CN8380
remains in the reset state.
2.2.4.2 Hard Reset
Hard reset is initiated by bringing the RESET pin active (low). Once initiated, the
internal reset process completes in 5 µs maximum. If the RESET pin is held active
continuously, the clock and data outputs and the IRQ pin remain three-stated. The
following output pins are forced to high impedance while RESET is held active:
RPOSO[1:4]
RNEGO[1:4]
RCKO[1:4]
XTIP[1:4]
XRING[1:4:]
CLK1544
CLK2048
2.2.4.3 Soft Reset
N8380DSA
CLADO
TCLK[1:4]
IRQ
RLOS[1:4]
JATERR[1:4]
SDO
TDO
In Host Mode, soft reset is initiated by writing a one to the RESET bit in the
Global Configuration register [addr 01]. The RESET bit is self-clearing. Once
initiated, the internal reset process completes in 5 µs maximum and the device
enters normal operation.
Conexant
Advance Information
2-5
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.3 Receiver
2.3 Receiver
Bipolar AMI pulses are input on the receiver input pins, RTIP[n] and RRING[n].
The receiver recovers clock and data from the AMI signal which has been
attenuated and distorted due to the line characteristics. The AMI pulses are
converted into bipolar or unipolar, NRZ data and output on RPOSO[n] and
RNEGO[n], along with the recovered clock on RCKO[n]. Figure 2-3 illustrates
the relationship between the AMI received signal, the recovered clock, and the
data outputs. This section discusses each receiver block from the line input to the
digital outputs.
Figure 2-3. Receiver Signals
Data Slicer Level
(50% of Peak)
Internal
Equalized
Received
Signal
RCKO
BPV
RPOSO
(Bipolar)
RNEGO
(Bipolar)
RDATO
(Unipolar)
1
1
1
0
1
1
0
1
1
8380_008
BPV
(Unipolar)
2.3.1 Data Recovery
The receiver recovers data by normalizing the input signal with an automatic gain
control (AGC) circuit, removing distortion with an equalizer, and extracting the
data using a data slicer. The transfer function of the equalizer is adjusted based on
the average peak value of the input signal. The AGC maintains the equalizer’s
average peak output level to a constant value. The data slicer compares the
equalizer output to a threshold value equal to 50% of the average peak equalizer
output level and produces both positive and negative pulse detect signals. The
data slicer outputs are re-timed using the recovered clock and routed to the RZCS
decoder (or to the JAT).
2-6
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.3.1.1 Raw Receive
Mode
2.3 Receiver
Optionally, the data slicer outputs, before re-timing, can be routed directly to the
RPOSO and RNEGO digital output pins. This option (raw receive mode) is
selected by asserting the RAWMD[n] pin in Hardware Mode or by asserting the
RAWMD register bit [RLIU_CR; addr n1] in Host Mode. In raw receive mode,
RCKO is replaced by the logical OR of the RPOSO and RNEGO output signals.
This mode is useful in applications which provide external clock and data
recovery. Figure 2-4 illustrates the raw mode receiver signals.
Figure 2-4. Raw Mode Receiver Signals
Data Slicer Level
(50% of Peak)
Internal
Equalized
Received
Signal
BPV
RPOSO
(RAW Mode)
RNEGO
(RAW Mode)
RCKO
(RAW Mode)
8380_009
2.3.1.2 Sensitivity
The receiver is capable of recovering signals with cable attenuation in the range of
+3 to –12 dB in E1 and T1 modes. The receiver is configured by setting register
bits appropriately in Host Mode or by setting configuration pins in Hardware
Mode. See Table 2-1for line compatible modes.
Table 2-1. Line Compatible Modes
Mode
2.3.1.3 Bridge Mode
N8380DSA
Receiver Sensitivity
RALOS
Threshold
Squelch
Threshold
RLOS
Detect
T1
+3 dB to –12 dB
–18 dB
–18 dB
100 zeros
T1/E1 20 dB
Bridge
–17 dB to –26 dB
NA
NA
100 zeros
E1
+3 dB to –12 dB
–18 dB
–18 dB
32 zeros
In Host Mode, the receiver allows interfacing to network test (MON) points
which are resistively attenuated with resisters in series with transmit and receive
Tip and Ring signals. The Bridge Monitor Level is –20 dB. Bridge operation is
enabled by setting register bit ATTEN [addr n1] to 1. In this mode, RALOS
detection and squelch operation are disabled.
Conexant
Advance Information
2-7
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.3 Receiver
2.3.1.4 Loss Of Signal
Detector
The Receive Loss of Signal (RLOS) Detector monitors both consecutive 0s and
signal level. Receive Analog Loss Of Signal (RALOS) is declared when
RTIP/RRING input signal amplitude is a certain level (RALOS level) below the
nominal receive level for at least 1 ms (2 ms maximum). RALOS status is cleared
as soon as pulses above the RALOS level are detected.
In Host Mode, the received data can be replaced with all 0s (squelched) if the
receive level is also below the SQUELCH level. Squelch is enabled in register
RLIU_CR [addr n1]. In Host Mode, RALOS real time status is reported in the
ALARM [addr n5] register; and an interrupt status bit is available in the ISR [addr
n6] register. Also, RALOS is indicated on the RLOS[n] pin, which is the logical
NOR of the RLOS[n] status and RALOS[n] status.
RLOS is declared when 100 (T1) or 32 (E1) consecutive bits with no pulses
are detected. RLOS status is cleared when pulses are received with at least 12.5%
pulse density (during a period of 192 bits starting with the receipt of a pulse) and
where no occurrences of 100 or 32 consecutive bits with no pulses are detected.
In Host Mode, RLOS real time status is reported in the ALARM register [addr
n5]; and an interrupt status bit is available in the ISR register [addr n6]. Also,
RLOS is indicated by a 0 level on the RLOS[n] pin, which is the logical NOR of
the RLOS[n] status and RALOS[n] status.
2.3.2 Clock Recovery
2.3.2.1 Phase Lock Loop
The Receive Phase Lock Loop (RPLL) recovers the line rate clock from the data
slicer dual-rail outputs. The RPLL generates a recovered clock that tracks jitter in
the data and sustains the data-to-clock phase relationship in the absence of
incoming pulses. The RPLL is a digital PLL which adjusts its output phase in
1/16 unit interval (UI) steps. Consequently, the RPLL adds approximately 0.12 UI
peak-to-peak jitter to the recovered receive clock.
During loss of signal (RLOS or RALOS), the RPLL maintains an output clock
signal and smoothly transitions to a nominal line rate frequency determined by
the CLAD input reference (selected by CMUX [GCR; addr 01] or FREE
[CLAD_CR; addr 02]). If the CLAD reference is the recovered received clock
from a channel which has detected RLOS, the CLAD outputs and the recovered
received clock enter a “hold-over” state to maintain the average frequency that
was present just before the RLOS was detected.
2.3.2.2 Jitter Tolerance
Figure 2-8, Receiver Input Jitter Tolerance, illustrates the receiver’s jitter
tolerance for all jitter attenuator (JAT) configurations: JAT disabled and JAT
enabled in the receive path with each JAT elastic store size. The jitter tolerance of
the clock and data recovery circuit alone (not including the JAT) is illustrated by
the curve labeled with “JAT Disabled.” The receiver meets jitter tolerance
specifications TR62411, G.823, and G.824. In addition, the receiver meets jitter
tolerance tests defined in ETS300 011: ISDN; Primary Rate User-Network
Interface Layer 1 Specification and Test Principles.
2.3.3 Receive Jitter Attenuator
The data slicer outputs can be routed to the JAT before going to the RZCS
decoder. The JAT attenuates clock and data jitter introduced by the line or added
by the clock recovery circuit. The JAT can be placed in the receive path or
transmit path, but not in both simultaneously. If the JAT is placed in the receive
2-8
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.3 Receiver
path, RCKO is replaced with the jitter attenuated clock. The JAT performance is
discussed in Section 2.6, Jitter Attenuator.
In Host Mode, the JAT is configured for each channel independently and is
put in the receive path by setting JEN and JDIR register bits to 1 [JAT_CR; addr
n0]. In Hardware Mode, the JAT is configured for all channels globally using the
JSEL(2:0) and JDIR pins. Refer to Chapter 1.0, Pin Descriptions for details.
2.3.4 RZCS Decoder
The RZCS decoder decodes the dual-rail data from the data slicer or from the JAT.
In T1 mode, the RZCS decoder replaces received B8ZS codes with eight 0s. In E1
mode, HDB3 codes are replaced with four 0s. The B8ZS code is 000VB0VB and
the HDB3 code is X00V; where B is a normal AMI pulse, V is a bipolar violation,
and X is a don't-care.
ZCS decoding (and encoding) can be enabled only if the digital interface
mode is unipolar. In Host Mode, RZCS decoding (and TZCS encoding) is enabled
for each channel by setting the ZCS [RLIU_CR; addr n1] register bit to 1. In
Hardware Mode, ZCS encoding/decoding is controlled globally for all channels
by pulling the ZCS pin high. For the Hardware Mode pin definition, see
Table 1-1.
2.3.5 Receive Digital Interface
The digital receiver outputs are provided on the RPOSO[n], RNEGO[n], and
RCKO[n] pins, where [n] is channel number 1 to 4. The receiver outputs can be
configured to operate in two modes: Bipolar NRZ format or unipolar NRZ
format. In both modes, RPOSO[n] and RNEGO[n] outputs are clocked by
RCKO[n], the recovered line rate clock, or the jitter attenuated clock if the JAT is
enabled in the receive path. RCKO[n] polarity is configurable by the CLK_POL
pin in Hardware Mode or register bit CLK_POL [RLIU_CR; addr n1] in Host
Mode. RPOSO[n], RNEGO[n], and RCKO[n] are three-stated during device
reset.
2.3.5.1 Bipolar Mode
In bipolar mode, RPOSO/RNEGO signals output received data in bipolar
dual-rail format, where a high level on RPOSO indicates receipt of a positive
AMI pulse, and a high level on RNEGO indicates receipt of a negative AMI pulse
on RTIP/RING inputs. In bipolar mode, the RZCS decoder is not available. In
Hardware Mode, bipolar operation is enabled globally for all channels by pulling
the UNIPOLAR pin low. In Host Mode, bipolar operation is enabled per channel
by writing a 0 to register bit UNIPOLAR [RLIU_CR; addr n1].
2.3.5.2 Unipolar Mode
In unipolar mode, RPOSO/RNEGO signals are replaced by RDATO/BPV signals.
AMI encoded received data is decoded and output on RDATO in NRZ format,
and BPV indicates that the currently received bit is a bipolar violation. If the
RZCS decoder is enabled, the BPV pin indicates only bipolar violations which are
not part of a ZCS code (B8ZS or HDB3). In Hardware Mode, unipolar operation
is enabled by pulling the UNIPOLAR pin high. In Host Mode, unipolar operation
is enabled by writing a 1 to register bit UNIPOLAR [RLIU_CR; addr n1].
N8380DSA
Conexant
Advance Information
2-9
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
2.4 Transmitter
Bipolar or unipolar, NRZ digital transmit data are input on TPOSI and TNEGI
using the transmit clock TCLK. Data are converted into AMI pulses, shaped
according to required standards, and transmitted to the line. Figure 2-5 illustrates
the relationship between the AMI transmitted signal, the transmit clock, and the
data inputs. This section discusses each transmitter block, from the digital inputs
to the line output.
Figure 2-5. Transmitter Signals
TCLK
TPOSI
(Bipolar)
TNEGI
(Bipolar)
TDATI
(Unipolar)
1
1
0
1
1
0
0
1
Throughput
Delay
XTIP,
XRING
8380_010
2.4.1 Transmit Digital Interface
The digital transmitter inputs, TPOSI[n] and TNEGI[n], accept bipolar or
unipolar NRZ formatted data for transmission and are sampled by the falling edge
of TCLK[n], where [n] is channel number 1 to 4. TCLK[n] is the line rate
transmit clock and is normally supplied externally from a line rate source, but can
also be sourced internally (only in Host Mode) from the CLAD. If sourced
internally, TCLK[n] is configured as an output to provide the line rate clock to
external circuitry. TCLK[n] direction is configured globally for all channels by
writing to register bit TCLK_I/O [GCR; addr 01].
2.4.1.1 Bipolar Mode
2-10
In bipolar mode, TPOSI/TNEGI inputs accept bipolar dual-rail transmit data
where a high on TPOSI causes a positive output pulse and a high on TNEGI
causes a negative output pulse on XTIP/XRING. In this mode, the TZCS encoder
is not available. In Hardware Mode, bipolar operation is enabled globally for all
channels by pulling the UNIPOLAR pin low. In Host Mode, bipolar operation is
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
enabled per channel by writing a 0 to register bit UNIPOLAR [RLIU_CR;
addr n1].
2.4.1.2 Unipolar Mode
In unipolar mode, TPOSI is replaced with TDATI and accepts unipolar NRZformatted transmit data. TNEGI is not used in this mode. A high on TDATI
causes an AMI pulse to be transmitted to the line. In this mode, the TZCS encoder
can be enabled to provide B8ZS or HDB3 zero code suppression. In Hardware
Mode, unipolar operation is enabled globally for all channels by pulling the
UNIPOLAR pin high. In Host Mode, unipolar operation is enabled per channel
by writing a 1 to register bit UNIPOLAR [RLIU_CR; addr n1].
2.4.2 TZCS Encoder
If enabled, the TZCS encoder encodes unipolar transmit data on TDATI with
B8ZS (T1) or HDB3 (E1) line coding. In T1 mode, eight consecutive 0s are
replaced with 000VB0VB; and in E1 mode, four consecutive 0s are replaced with
X00V; where B is a normal AMI pulse, V is a bipolar violation, and X is a Don't
Care. These are standard T1 and E1 line code options.
ZCS encoding (and decoding) can be enabled only if the digital interface
mode is unipolar. In Host Mode, TZCS encoding (and RZCS decoding) is enabled
for each channel by setting the ZCS [RLIU_CR; addr n1] register bit to 1. In
Hardware Mode, ZCS encoding/decoding is controlled globally for all channels
by pulling the ZCS pin high. For the Hardware Mode pin definition, refer to
Table 1-1.
2.4.3 Transmit Jitter Attenuator
Transmit data from the TZCS encoder can be routed to the JAT before going to
the AIS Generator. The JAT attenuates clock and data jitter from the transmit
inputs or from the receiver if Remote Line Loopback (RLL) is active. The JAT
can be placed in the receive path or transmit path, but not both simultaneously. If
the JAT is placed in the transmit path, the jitter attenuated clock becomes the
transmit clock for downstream circuits.
In Host Mode, the JAT is configured for each channel independently and is
put in the transmit path by setting the JEN register bit to 1 and the JDIR register
bit to 0 [JAT_CR; addr n0]. In Hardware Mode, the JAT is configured for all
channels globally using the JSEL(2:0) and JDIR pins. For pin definitions, refer to
Chapter 1.0, Pin Descriptions; for JAT transfer characteristics, refer to Figure 2-9;
and for more information on loopbacks, refer to Section 2.5, Loopbacks.
2.4.4 All 1s AIS Generator
The transmit data can be replaced with unframed all 1s for transmitting the alarm
indication signal (AIS). This includes replacing data supplied from
TPOSI[n]/TNEGI[n] pins and from the receiver during RLL. AIS transmission
does not affect transmit data that is looped back to the receiver during Local
Digital Loopback (LDL). This allows LDL to be active simultaneously with the
transmission of AIS. AIS is used to maintain a valid signal on the line and to
inform downstream equipment that the transmit data source has been lost. AIS
transmission can be done manually or automatically when loss of transmit clock
is detected. A clock monitor circuit allows manual or automatic switching of the
transmit clock to an alternate AIS clock.
N8380DSA
Conexant
Advance Information
2-11
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
In Hardware Mode, AIS can be controlled only manually by pulling the
TAIS[n] hardware pin low. If TCLK[n] is present, then it is used to transmit AIS.
If TCLK[n] is not present (for two clock periods), the alternate AIS clock on
either TACKI (T1 Mode) or EACKI (E1 Mode) is used. The AIS transmit clock
switches back to TCLK[n] when the TCLK[n] signal returns.
In Host Mode, AIS can be transmitted using the TAIS[n] hardware pins or the
TAIS register bit, or automatically by enabling the AUTO_AIS register bit. AIS
clock switching can be enabled by using the AISCLK register bit. Setting
AISCLK to 1 forces the use of the alternate AIS clock on either TACKI (T1
Mode) or EACKI (E1 Mode) pins when transmitting AIS. If AUTO_AIS is set
to 1, AIS is automatically transmitted when the clock monitor detects loss of
clock on TCLK[n]. When using automatic AIS transmission, the user should also
enable the AISCLK bit and provide an alternate clock source to insure that AIS
will be transmitted. CLAD output clocks CLK2048 and CLK1544 can be
connected externally to EACKI and TACKI alternate AIS clock inputs for this
purpose. Setting register bit TAIS_PE to 1 disables the TAIS register bit and
allows manual transmission of AIS using the TAIS[n] hardware pins. Refer to
LIU_CTL [addr n3] in Chapter 3.0, Registers, and to Table 1-1, Hardware Signal
Definitions.
If TAIS is activated when Remote Line Loopback is active, AIS is transmitted
using the received clock (or JCLK if the JAT is enabled in the receive direction).
Table 2-2 lists transmitter operating modes resulting from various configuration
settings and input conditions.
Table 2-2. Transmitter Operating Modes
Configuration and Input Status
Transmitter Mode
RLOOP
(W/LLOOP=0)
TLOC
TAIS
AUTO_AIS
AISCLK
Transmit
Data
Transmit
Clock
0
X
0
0
X
Tx Data
TCLK
0
X
1
X
0
AIS
TCLK
0
X
1
X
1
AIS
TACKI/EACKI
0
0
0
1
X
Tx Data
TCLK
0
1
0
1
0
AIS
TCLK
0
1
0
1
1
AIS
TACKI/EACKI
1
X
0
X
X
Rx Data
RCLK
1
X
1
X
X
AIS
RCLK
NOTE(S): X is don’t-care.
2-12
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
2.4.5 Pulse Shaper
All transmit pulse shaping to meet E1 and T1 transmission standards is done
internally, eliminating the need for external shaping circuitry. The pulse shape
block receives bipolar NRZ transmit data, produces a set of eight 5-bit values
which define the pulse shape, and converts the shape values into an analog pulse
using a DAC. Table 2-3 lists the transmit pulse template selections and
applications.
Table 2-3. Transmit Pulse Configurations
Line Rate
Line Length
Hardware Mode
Configuration
PTS(2:0)
Host Mode Configuration
[TLIU_CR; addr n2]
PULSE(2:0)
T1
0–133 ft.
000
000
T1
133–266 ft.
001
001
T1
266–399 ft.
010
010
T1
399–533 ft.
011
011
T1
533–655 ft.
100
100
ITU–T G.703
75 Ω Coaxial Cable
E1
—
101
101
ITU–T G.703
120 Ω Twisted Pair
E1
—
110
110
FCC Part 68 Opt A
I.431
100 Ω Twisted Pair
T1
—
111
111
Application
DSX-1
T1.102
CB119
100 Ω Twisted Pair
In Hardware Mode, standard pulse templates are selected globally for all
channels using hardware pins PTS(2:0). Refer to the Chapter 1.0, Pin
Descriptions, and Table 1-1, Hardware Signal Definitions.
N8380DSA
Conexant
Advance Information
2-13
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
In Host Mode, standard pulse templates are selected per channel by writing to
register bits PULSE(2:0) [TLIU_CR; addr n2]. If desired, custom pulse shapes
can be programmed for each channel using the SHAPEn [addr n8 – nF] registers
and the PPT [TLIU_CR; addr n2] register bit. The data written into the SHAPEn
registers is 5-bit magnitude only. The first four code values of the pulse define the
first half of the symbol, and the last four values define the last half of the symbol.
The last half symbol polarity is always forced to be opposite from the first half
polarity. Figure 2-6 illustrates the shaped transmit signals.
Figure 2-6. Transmit Pulse Shape
TCLK
8 x TCLK
Digitized
AMI Pulses
Shape Data
Magnitude
(0x00–0x1F)
Positive Pulse
Negative Pulse
8380_011
2.4.6 Driver
The transmit DAC converts digitally shaped AMI pulses into analog bipolar
signals. The line driver provides a high impedance, current drive for the transmit
DAC and outputs transmit signals to the XTIP[n] and XRING[n] output pins. The
high impedance driver allows line impedance matching using external parallel
resistors to meet return loss requirements. In applications which require surge
protection, pulse amplitude compensation is provided if protection resistors are
needed in series with XTIP[n] and XRING[n]. When a shorted line is detected,
transmit monitor and protection circuits reduce the output current level to less
than 50 mA peak. The standard transmit transformer for the CN8380 has a turns
ratio of 1:2 (chip-side: line-side). To minimize power consumption, an alternate
1:1.36 turns ratio transformer can be used in an unterminated configuration.
2.4.6.1 Transmit
Termination Options
2-14
Various transmitter termination options are available to meet almost any interface
requirement. Figure 2-7 illustrates the location of the transmit termination
components. In this figure, Ct is a smoothing capacitor across XTIP and XRING.
The recommended value for Ct is 150 pF. If other components are also connected
to XTIP/XRING, such as surge protection diodes, Ct’s value should be adjusted to
maintain a total parallel capacitance of approximately 150 pF.
Rt is a parallel termination resistor selected to provide the required transmitter
return loss, typically –18 dB. If an application does not have a return loss
requirement, Rt can be omitted in order to reduce total power consumption.
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N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
The standard transformer recommended has a turns ratio of 1:2. This turns
ratio is required if parallel termination (Rt) or series resistors (Rs) are desired.
The alternate transformer has a turns ratio of 1:1.36. This transformer can be used
only if all of the following are true:
•
•
•
Parallel termination (Rt) is not used.
Series resistors (Rs) are not used.
T1 DSX-1 transmit pulse is not used.
Refer to Option E in Table 2-7 below. Transmitter power consumption is
reduced by approximately 30%, compared to the unterminated, standard
transformer configuration.
Resistors (Rs) in series with Tx TIP and Tx RING line connections are
sometimes used with surge protection circuits. Without compensation, the
addition of these resistors decreases the transmit pulse amplitude. The CN8380
provides an option in Host Mode to boost the output level if resistors are installed.
Compensation is optimized for the use of 5.6 Ω Rs values. In Hardware Mode,
these resistors are required.
Figure 2-7. Transmit Termination Components
1:N
Rs
XTIP
Tx TIP
Ct
CN8380
Rt
Rs
Tx RING
XRING
Transformer
8380_012
Tables 2-4 through 2-8 provide recommended termination component values
and CN8380 configuration information for all termination options supported. The
resulting return loss value is also listed. All five options are supported in Host
Mode, whereas only options C and D are supported in Hardware Mode.
Before selecting a termination option, refer to Table 2-3, Transmit Pulse
Configurations, to select an application mode. Then refer to the Transmit
Termination tables below to select a termination option.
N8380DSA
Conexant
Advance Information
2-15
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
Option A
Option A uses the standard 1:2 transformer, no series protection resistors (Rs),
and no parallel termination (Rt) for T1 applications. In E1 applications, Rt is
included because it is usually required to provide a minimal level of line
impedance matching.
Table 2-4. Transmit Termination Option A
Series Resistors
(Rs)
Parallel Termination
(Rt, Ω)
Return Loss
(dB)
T1—DSX-1
None
None
0
E1—75 Ω
None
126.4
–10
E1—120 Ω
None
204.4
–10
T1— I.431
None
None
0
Application
NOTE(S):
1. Standard Transformer (1:2 turns ratio)
2. Hardware Mode: HTERM=0
3. Host Mode: ALT_TR = 0, TERM = 0, T_BOOST = 0 [TLIU_CR; addr n2]
Option B
Option B uses the standard 1:2 transformer and no series protection resistors (Rs).
A common parallel termination (Rt) for both T1 and E1 applications is included
to provide line impedance matching.
Table 2-5. Transmit Termination Option B
Series Resistors
(Rs)
Parallel Termination
(Rt, Ω)
Return Loss
(dB)
T1—DSX-1
None
23.7
–30
E1—75 Ω
None
23.7
–18
E1—120 Ω
None
23.7
–18
T1— I.431
None
23.7
–30
Application
NOTE(S):
1. Standard Transformer (1:2 turns ratio)
2. Hardware Mode: Not applicable
3. Host Mode: ALT_TR = 0, TERM = 1, T_BOOST = 0 [TLIU_CR; addr n2]
2-16
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N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
Option C
Option C uses the standard 1:2 transformer and no parallel termination (Rt) for
T1 applications. In E1 applications, Rt is included because it is usually required to
provide a minimal level of line impedance matching. Series protection resistors
(Rs) are included. Option C is available only in Host Mode.
Table 2-6. Transmit Termination Option C
Series Resistors
(Rs)
Parallel Termination
(Rt, Ω)
Return Loss
(dB)
T1—DSX-1
2 × 5.6 Ω
None
0
E1—75 Ω
2 × 5.6 Ω
114.8
–10
E1—120 Ω
2 ×5.6 Ω
190.0
–10
T1—I.431
2 × 5.6 Ω
None
0
Application
NOTE(S):
1. Standard Transformer (1:2 turns ratio)
2. Hardware Mode: HTERM = 0
3. Host Mode: ALT_TR = 0, TERM = 0, T_BOOST = 1 [TLIU_CR; addr n2]
Option D
Option D uses the standard 1:2 transformer. A common parallel termination (Rt)
for both T1 and E1 applications is included to provide line impedance matching.
Series protection resistors (Rs) are also included. Option D is available in both
Host Mode and Hardware Mode.
Table 2-7. Transmit Termination Option D
Series Resistors
(Rs)
Parallel Termination
(Rt, Ω)
Return Loss
(dB)
T1—DSX-1
2 × 5.6 Ω
21
–30
E1—75 Ω
2 × 5.6 Ω
21
–18
E1—120 Ω
2 × 5.6 Ω
21
–18
T1—I.431
2 × 5.6 Ω
21
–30
Application
NOTE(S):
1. Standard Transformer (1:2 turns ratio)
2. Hardware Mode: HTERM = 1
3. Host Mode: ALT_TR = 0, TERM = 1, T_BOOST = 1 [TLIU_CR; addr n2]
N8380DSA
Conexant
Advance Information
2-17
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
Option E
Option E uses the alternate 1:1.36 transformer, no series protection resistors (Rs),
and no parallel termination (Rt) for T1 applications. In E1 applications, Rt is
included because it is usually required to provide a minimal level of line
impedance matching. Option E is available only in Host Mode and cannot be used
with DSX-1 applications.
Table 2-8. Transmit Termination Option E
Series Resistors
(Rs)
Parallel Termination
(Rt, Ω)
Return Loss
(dB)
E1—75 Ω
None
68.1
–10
E1—120 Ω
None
107.0
–10
T1—I.431
None
None
0
Application
NOTE(S):
1. Alternate transformer (1:1.36 turns ratio)
2. Hardware Mode: Not Applicable
3. Host Mode: ALT_TR = 1, TERM = 0, T_BOOST = 0 [TLIU_CR; addr n2]
2.4.6.2 Output Disable
2-18
The transmitter analog outputs, XTIP[n] and XRING[n], are enabled per channel
by pulling the XOE[n] pins low and are three-stated by pulling the XOE[n] pins
high. In Host Mode, the PDN [TLIU_CR; addr n2] register bit also controls the
XTIP[n] and XRING[n] outputs. A device RESET sets the PDN bits, thereby
disabling XTIP[n] and XRING[n]. User software must clear PDN to enable the
transmitter outputs.
In Hardware Mode, the transmitter outputs are disabled while RESET is held
active (low). When RESET is deactivated, XOE[n] controls the transmitter outputs.
If the transmit driver is disabled (XOE[n] = 1), the driver performance monitor
(DPM) is available for monitoring a transmit signal from an external source.
Refer to Section 2.4.7.2, Driver Performance Monitor.
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.4 Transmitter
2.4.7 Transmitter Output Monitoring
2.4.7.1 Short Circuit
Detect
The transmitter output pulse is monitored and a short circuit is detected when the
amplitude falls below an internally determined threshold for approximately 64-bit
times. The short circuit state deactivates when the amplitude rises above a second
threshold for 64-bit times.
When a short is detected, the line driver current is reduced to approximately
50 mA peak, as measured on the line side of the transformer. Typically, this is
caused by a transmit cable short circuit or by a transmission line transient current
surge. In Host Mode, short circuit activation sets the TSHORT bit in the Alarm
Status register [ALARM; addr n5] and in the Interrupt Status Register [ISR; addr
n6]. No indication of short circuit is available in Hardware Mode.
2.4.7.2 Driver
Performance Monitor
The DPM monitors the line driver output signal for valid signaling activity. The
output signal is monitored for pulse level, invalid AMI coding, pulse density, and
stuck signals. In Host Mode, a DPM fault condition sets the TLOS bit in the
Alarm Status register [ALARM; addr n5] and in the Interrupt Status Register
[ISR; addr n6]. In Hardware Mode, the four internal DPM status indicators are
combined (logical NOR) and output on the IRQ pin.
If the transmit driver is disabled (XOE = 1), the DPM is available for
monitoring a transmit signal from an external source. In this mode, XTIP[n] and
XRING[n] are used as inputs and can be connected to the transmit outputs of
another CN8380 channel or device.
N8380DSA
Conexant
Advance Information
2-19
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.5 Loopbacks
2.5 Loopbacks
Three per-channel loopbacks are provided for system diagnostic testing: Local
Analog Loopback, Local Digital Loopback, and Remote Line Loopback.
Loopbacks can be controlled by either hardware pins or internal register bits. For
hardware control, two dedicated pins—LLOOP and RLOOP—are provided. If
configured in Host Mode, register bits are provided for loopback control. In
addition, the LLOOP and RLOOP pins can be enabled by register bits so that
loopbacks can be controlled by the hardware pins even in Host Mode. Loopback
controls are detailed in Table 2-9. Refer also to register LIU_CTL [addr n3] in
Chapter 3.0, Registers.
Table 2-9. Loopback Control Pins
LLOOP
RLOOP
Loopback
1
1
None
1
0
Remote Line Loop
0
1
Local Analog Loop
0
0
Local Digital Loop
2.5.1 Local Analog Loopback
Local Analog Loopback (LAL) causes the transmit data and clock inputs
(TPOSI/TNEGI and TCLK) to be looped back to the receiver outputs
(RPOSO/RNEGO and RCKO). This loopback connects an internal copy of the
analog transmit signal (XTIP and XRING outputs) to the receiver input, so that
virtually all of the device circuitry can be tested. While LAL is active, transmit
data continues to be transmitted on XTIP and XRING, but RTIP and RRING
inputs are ignored. Applying a high on the XOE pin when Local Analog Loopback
is active disables the transmitter outputs and causes an RLOS.
2.5.2 Local Digital Loopback
Local Digital Loopback (LDL) causes the transmit data and clock inputs
(TPOSI/TNEGI and TCLK) to be looped back to the receiver outputs
(RPOSO/RNEGO and RCKO). This loopback includes the JAT (if enabled) but
does not include the line transmit and receive circuitry. Consequently, XTIP and
XRING transmitter outputs are unaffected, and receiver RTIP and RRING inputs
remain connected to the line to monitor for RLOS. Also, the AIS (all 1s)
generator is not included in the loopback path so that AIS can be transmitted
toward the line while simultaneously providing a local loopback.
2-20
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.5 Loopbacks
2.5.3 Remote Line Loopback
Remote Line Loopback (RLL) causes the received data on RTIP/RRING line
inputs to be looped back and re-transmitted on XTIP/XRING line outputs. This
loopback includes all receive and transmit circuitry and the JAT, but does not
include the ZCS decoder and encoder. If the JAT is not enabled, RLL enables the
JAT in the transmit direction for the duration of the loopback. In this case, the JAT
elastic store size is 8 bits. The receiver outputs (RPOSO/RNEGO and RCKO)
continue to output received data; transmit inputs (TPOSI/TNEGI and TCLK) are
ignored.
N8380DSA
Conexant
Advance Information
2-21
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.6 Jitter Attenuator
2.6 Jitter Attenuator
The jitter attenuator (JAT) attenuates jitter in the receive or transmit path, but not
both simultaneously. The JAT path configuration and elastic store depth is
controlled by the JDIR and JSEL(2:0) pins in Hardware Mode or by the JEN,
JDIR, JCENTER, and JSIZE[2:0] bits in the Jitter Attenuator Configuration
register [JAT_CR; addr n0] in Host Mode. The JAT can also be completely
disabled.
The elastic store is configurable using the JSEL(2:0) pins or the JSIZE[2:0]
bits in the JAT_CR register. The elastic store sizes available are 8, 16, 32, 64, and
128 bits. The 32-bit elastic store depth is sufficient to meet jitter tolerance
requirements in all cases where the JAT cutoff frequency is 6 Hz or below, and
when the selected clock reference is frequency-locked. The larger elastic store
depths allow greater accumulated phase offsets. For example, the 128-bit depth
can tolerate up to ±64 bits of accumulated phase offset. Because the elastic store
is a fixed size, it can overflow and under-run. If either of these conditions occurs,
a Jitter Attenuator Elastic Store Limit Error (JATERR) is reported. In Hardware
Mode, JATERR[n] pins are provided, and in Host Mode, the JERR bit in the
Interrupt Status Register [ISR; addr n6] is set.
The elastic store is a circular buffer with independent read and write pointers.
These pointers can be initialized manually using JCENTER in the JAT_CR
register. JCENTER resets the write pointer and forces the elastic store read
pointer to one half of the programmed JSIZE. Centering is automatic as a result of
a JATERR condition, so manually centering is not required.
The dejittered receiver recovered clock is output on the RCKO[n] pin if the
JAT is configured in the receive path. The receiver input clock and data jitter
tolerance and jitter transfer meet TR 62411-1990. Figures 2-8 and 2-9 illustrate
jitter tolerance and JAT transfer characteristics.
2-22
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.6 Jitter Attenuator
Figure 2-8. Receiver Input Jitter Tolerance
Sine Wave Jitter Amplitude (UI pk-pk) [Log Scale]
10000
Typical Receiver Tolerance with
JAT Disabled
1000
Typical Receiver Tolerance with
Various JAT Sizes Selected
138 UI
128 bits
100
TR 62411 (T1)
Minimum Tolerance
10
1
64 bits
28 UI
32 bits
16 bits
G.824 (T1)
Minimum Tolerance
5 UI
Rec. G.823 (E1)
Minimum Tolerance
8 bits
1.5 UI
0.4 UI
0.2 UI
0.1 UI
0.1
0.1
1
10
100
1000
10000
100000
Sine Wave Jitter Frequency (Hz) [Log Scale]
8380_013
N8380DSA
Conexant
Advance Information
2-23
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.6 Jitter Attenuator
Figure 2-9. Typical JAT Transfer Characteristics with Various JAT Sizes
0
-10
Jitter Attenuation (dB)
Rec G.735
(Min. Atten Boundary)
-20
-30
PUB 62411
(Min. Atten. Boundary)
-40
PUB 62411
(Max. Atten. Boundary)
-50
JAT Size = 128
64
32
16
8
-60
1
10
100
1000
10000
100000
0_014
Sine Wave Jitter Frequency (Hz) [Log Scale]
2-24
Conexant
Advance Information
N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.7 Clock Rate Adapter
2.7 Clock Rate Adapter
The CLAD uses an input clock reference at a particular frequency (8 kHz to
16,384 kHz) to synthesize output clocks at a different frequency (8 kHz to 16,384
kHz). The CLAD outputs are frequency-locked to the selected timing reference.
The CLAD can operate with input reference frequencies at multiples and
submultiples of T1 or E1 line rates. The CLAD block diagram is illustrated in
Figure 2-10.
Figure 2-10. CLAD Block Diagram
Clock Rate Adapter (CLAD)
RCKO[1]
RCKO[2]
[CMUX]
Clock
Monitor
CLADI
RCKO[3]
[G_T1/E1N]
RCKO[4]
[CPD_IE]
CLAD Control/
Status
[CPDERR]
[CPD_INT]
÷ [RSCALE] Factor
CLADR
Loop
Filter
[LFGAIN]
NCO
÷ [VSCALE] Factor
CLADV
Divider Chain
CLK2048
1.544 MHz
CLK1544
13
Refer to the following registers:
Global Configuration; addr 01
CLAD Configuration; addr 02
CLAD Frequency Select; addr 03
CLAD Phase Detector Scale Factor; addr 04
CLAD Status; addr 06
N8380DSA
REFCKI
CLK32
14
[OSEL]
Labels in brackets [ ] refer
to register bits.
32.768 MHz
2.048 MHz
[VSEL]
Device I/O Pin
10 MHz
[FREE]
CLADO
[CLK_OE]
Conexant
Advance Information
8380_015
Phase
Detector
2-25
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.7 Clock Rate Adapter
2.7.1 Inputs
In Hardware Mode, the CLAD input timing reference is normally taken from a
line rate (1,544 kHz—T1 or 2,048 kHz—E1) clock on the CLADI pin. The line
rate is determined globally for all channels by settings on the PTS(2:0) pins. The
CLAD can be set in free-run mode by removing the clock from CLADI (pull high
or low). If clock edges are not present on CLADI, an internal clock monitor
automatically switches the timing reference to use the 10 MHz, REFCKI
reference. When clock edges are sensed on CLADI, the reference is switched
back to CLADI.
In Host Mode, the CLAD input timing reference can be selected from six
sources. The source can be the received recovered clock (or jitter attenuated
clock) output (RCKO[n]) from any of the four channels, the CLADI input pin, or
the 10 MHz, REFCKI input (free-run mode). The CLAD reference is configured
by writing to the CMUX[2:0] bits in the Global Control Register [GCR; addr 01].
Free-run mode is selected by writing 1 to the FREE bit in the CLAD
Configuration Register [CLAD_CR; addr 02].
2.7.2 Outputs
Four CLAD output pins are provided: CLADO, CLK32, CLK1544, and
CLK2048. In Hardware Mode, the CLADO output provides only a fixed 8 kHz
clock. In Host Mode, the CLADO frequency is programmable. Table 2-10 lists
the CLAD outputs and frequencies. For pin definitions, refer to Table 1-1
.
Table 2-10. CLAD Outputs and Frequencies
CLAD Output
Frequency
CLADO
Host Mode—Programmable to various frequencies in the range of
8 kHz to 32,768 kHz.
Hardware Mode—Fixed 8 kHz.
CLK32
Fixed 32,768 kHz
CLK1544
Fixed 1,544 kHz
CLK2048
Fixed 2,048 kHz
2.7.3 Configuration Options
CLAD modes are selected using the CLAD Configuration Register [CLAD_CR;
addr 02]; the CLAD Frequency Select [CSEL; addr 03]; and the CLAD Phase
Detector Scale Factor [CPHASE; addr 04]. The CLAD reference can be any of 41
possible frequencies, as listed in Table 2-11.
2-26
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N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.7 Clock Rate Adapter
Table 2-11. CLAD Reference Frequencies and Configuration Examples (1 of 2)
N8380DSA
RSCALE
Phase
Compare
Frequency
(kHz)
VSCALE
CLADV
(kHz)
VSEL
8
000
8
111
1024
0001
16
000
16
110
1024
0001
32
000
32
101
1024
0001
64
000
64
100
1024
0001
128
000
128
011
1024
0001
256
000
256
010
1024
0001
512
000
512
001
1024
0001
1024
000
1024
000
1024
0001
2048
000
2048
000
2048
0010
4096
000
4096
000
4096
0011
8192
000
8192
000
8192
0100
16,384
000
16,384
000
16,384
0101
32,768
000
32,768
000
32,768
0110
CLAD
Reference
(kHz)
12.0625
000
12.0625
111
1544
0111
24.125
000
24.125
110
1544
0111
48.25
000
48.25
101
1544
0111
96.5
000
96.5
100
1544
0111
193
000
193
011
1544
0111
386
000
386
010
1544
0111
772
000
772
001
1544
0111
1544
000
1544
000
1544
0111
3088
000
3088
000
3088
1000
6176
000
6176
000
6176
1001
12,352
000
12,352
000
12,352
1010
24,704
000
24,704
000
24,704
1011
12
000
12
111
1536
1101
24
000
24
110
1536
1101
48
000
48
101
1536
1101
96
000
96
100
1536
1101
192
000
192
011
1536
1101
Conexant
Advance Information
2-27
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.7 Clock Rate Adapter
Table 2-11. CLAD Reference Frequencies and Configuration Examples (2 of 2)
RSCALE
Phase
Compare
Frequency
(kHz)
VSCALE
CLADV
(kHz)
VSEL
384
000
384
010
1536
1101
768
000
768
001
1536
1101
1536
000
1536
000
1536
1101
20
000
20
111
2560
1100
40
000
40
110
2560
1100
80
000
80
101
2560
1100
160
000
160
100
2560
1100
320
000
320
011
2560
1100
640
000
640
010
2560
1100
1280
000
1280
001
2560
1100
2560
000
2560
000
2560
1100
CLAD
Reference
(kHz)
To configure the CLAD:
Choose a CLADO output frequency. Refer to the CLAD Frequency Select
register [CSEL; addr 03] for a list of all possible CLADO output
frequencies.
2. Configure OSEL to select the CLADO output frequency.
3. Select the desired CLAD timing reference frequency from Table 2-11.
4. Configure RSCALE, VSCALE, VSEL from Table 2-11.
1.
Many RSCALE and VSCALE values other than those shown in Table 2-11 are
applicable. For instance, an alternate configuration for an input reference
frequency of 2048 kHz is displayed in Table 2-12.
Table 2-12. Sample Alternate Configuration
CLAD
Reference
(kHz)
2048
RSCALE
Phase
Compare
Frequency
(kHz)
VSCALE
CLADV
(kHz)
VSEL
001
1024
011
8192
0100
RSCALE is a programmable frequency divider which scales the CLAD
reference clock frequency before it is applied to the CLAD’s phase detector.
Similarly, VSCALE scales the CLAD’s internal feedback clock, CLADV. These
two clocks must have the same frequency at the phase detector’s inputs for the
CLAD’s loop to properly lock. So the rule is:
(CLAD reference freq.) ÷ (RSCALE factor) = (CLADV freq.) ÷ (VSCALE factor)
2-28
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N8380DSA
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.8 Test Access Port (JTAG)
2.8 Test Access Port (JTAG)
The CN8380 incorporates printed circuit board testability circuits in compliance
with IEEE Std P1149.1a–1993, IEEE Standard Test Access Port and
Boundary–Scan Architecture, commonly known as JTAG (Joint Test Action
Group).
The JTAG includes a test access port (TAP) and several data registers. The
TAP provides a standard interface through which instructions and test data are
communicated. A Boundary Scan Description Language (BSDL) file for the
CN8380 is available from the factory upon request.
The test access port consists of the TRST, TDI, TCK, TMS, and TDO pins. An
internal power on reset circuit or the TRST resets the JTAG port.
2.8.1 Instructions
In addition to the required BYPASS, SAMPLE/PRELOAD, and EXTEST
instructions, IDCODE instruction is supported. There are also two private
instructions. Table 2-13 lists the JTAG instructions and their codes.
Table 2-13. JTAG Instructions
Instructions
Code
BYPASS
1111
SAMPLE/PRELOAD
0001
EXTEST
0000
IDCODE
0010
2.8.2 Device Identification Register
The JTAG ID register consists of a 4-bit version, a 16-bit part number, and an
11-bit manufacturer number as listed in Table 2-14.
Table 2-14. Device Identification JTAG Register
Version
0
0
0
Part Number
0
1
0
0
0
0
0
1
1 1
0
Manufacturer ID
0
0
0
0
0
0
0
0
0
1
1
0
1
0x0
0x8380
0x0D6
4 Bits
16 Bits
11 Bits
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0
1
1
0
1
2-29
CN8380
2.0 Circuit Description
Quad T1/E1 Line Interface
2.8 Test Access Port (JTAG)
2-30
Conexant
Advance Information
N8380DSA
3
3.0 Registers
3.1 Address Map
The address map in Table 3-1 lists the three types of registers:
• Global Control and Status Registers
• Per Channel Registers
• Transmitter Shape Registers
Table 3-1. Address Map (1 of 2)
Address (Hex)
Acronym
R/W
Description
Default
Setting(1) (Hex)
Global Control and Status Registers
00
DID
R
Device Identification
(2)
01
GCR
R/W
Global Configuration
00
02
CLAD_CR
R/W
CLAD Configuration
00
03
CSEL
R/W
CLAD Frequency Select
00
04
CPHASE
R/W
CLAD Phase Detector Scale Factor
00
06
CSTAT
R
CLAD Status
—
Per Channel Registers (n = channel number: 1–4)
n0
JAT_CR
R/W
Jitter Attenuator Configuration
00
n1
RLIU_CR
R/W
Receiver Configuration
00
n2
TLIU_CR
R/W
Transmitter Configuration
00
n3
LIU_CTL
R/W
Line Interface Unit Control
00
n4
UNUSED
—
—
—
n5
ALARM
R
Alarm Status
—
n6
ISR
R
Interrupt Status Register
00
n7
IER
R/W
Interrupt Enable Register
00
n8
SHAPE0
R/W
Transmit Pulse Shape Configuration
00
n9
SHAPE1
R/W
Transmit Pulse Shape Configuration
00
N8380DSA
4/21/99
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3-1
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.1 Address Map
Table 3-1. Address Map (2 of 2)
Address (Hex)
Acronym
R/W
Description
Default
Setting(1) (Hex)
nA
SHAPE2
R/W
Transmit Pulse Shape Configuration
00
nB
SHAPE3
R/W
Transmit Pulse Shape Configuration
00
nC
SHAPE4
R/W
Transmit Pulse Shape Configuration
00
nD
SHAPE5
R/W
Transmit Pulse Shape Configuration
00
nE
SHAPE6
R/W
Transmit Pulse Shape Configuration
00
nF
SHAPE7
R/W
Transmit Pulse Shape Configuration
00
Reserved Registers
05
CTEST
R/W
(Factory use only)
00
07
FREG
R/W
(Factory use only)
00
08
TESTA1
R/W
(Factory use only)
00
09
TESTA2
R/W
(Factory use only)
00
0A
FUSE_CH1
R
(Factory use only)
—
0B
FUSE_CH2
R
(Factory use only)
—
0C
FUSE_CH3
R
(Factory use only)
—
0D
FUSE_CH4
R
(Factory use only)
—
0E
FUSE_RES
R
(Factory use only)
—
0F
TESTD
R/W
(Factory use only)
00
50
TESTA3
R/W
(Factory use only)
00
51
TESTA4
R/W
(Factory use only)
00
52–7F
RESERVED
Reserved
—
Note(s):
(1) Registers shown with a default setting are reset to the indicated value during internal power on reset, software RESET, or
hardware reset (RESET pin).
(2) Value depends on the current device revision. Consult factory.
3-2
Conexant
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N8380DSA
4/21/99
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.2 Global Control and Status Registers
3.2 Global Control and Status Registers
00—Device Identification (DID)
R
7
6
5
4
3
2
1
0
DID[7]
DID[6]
DID[5]
DID[4]
DID[3]
DID[2]
DID[1]
DID[0]
DID[7:4]
Device ID
DID[3:0]
Device Revision
01—Global Configuration (GCR)
R/W
7
6
5
4
3
2
1
0
RESET
G_T1/E1N
CLK_OE
CPD_IE
TCLK_I/O
CMUX[2]
CMUX[1]
CMUX[0]
RESET
Global Reset—When written to 1, initiates an internal global reset process which sets all
configuration registers to their default values for all four ports. Also, several output pins are
three-stated. After RESET is complete, the following is true:
• Digital receiver outputs (RPOSO[1:4], RNEGO[1:4], RCKO[1:4]) are three-stated.
• Transmitter line outputs (XTIP[1:4], XRING[1:4]) are three-stated.
• CLK1544, CLK2048, and CLADO clock outputs are three-stated.
• Transmitter clocks, TCLK[1:4] are configured as inputs.
• All interrupt sources are disabled.
• All configuration registers are set to default values.
G_T1/E1N
Global Clock Mode—This bit selects one of two CLAD operating modes. The CLAD can
operate in a mode which insures the minimum output jitter on the CLK1544 output or the CLK
2048 output.
0 = CLK2048 output jitter minimized
1 = CLK1544 output jitter minimized
CLK_OE
Clock Output Enable—Determines output state of CLK1544, CLK2048, and CLADO clock
outputs.
0 = Clock outputs are three-stated
1 = Clock outputs are enabled
CPD_IE
CLAD Phase Detector Error Interrupt Enable—Enables CLAD loss of lock detector,
CPD_INT [CSTAT; addr 06], to generate an interrupt request.
0 = Interrupt disabled
1 = Interrupt enabled
TCLK_I/O
Transmit Clock Input/Output—Determines whether TCLK[1:4] pins are inputs or outputs.
0 = TCLK[1:4] pins are inputs
1 = TCLK[1:4] pins are outputs
N8380DSA
4/21/99
Conexant
Advance Information
3-3
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.2 Global Control and Status Registers
CMUX[2:0]
CLAD Multiplexer Select—Selects the CLAD reference clock source input to the CLAD
phase detector if FREE = 0 [CLAD_CR; addr 02]. The source can be the receive recovered
clock output (RCKO) from any of the four channels or the CLAD input pin.
000 = CLADI pin
001 = RCKO[1] from channel #1
010 = RCKO[2] from channel #2
011 = RCKO[3] from channel #3
100 = RCKO[4] from channel #4
02—CLAD Configuration (CLAD_CR)
R/W
7
6
5
4
3
2
1
0
FREE
RSCALE[2]
RSCALE[1]
RSCALE[0]
LFGAIN[3]
LFGAIN[2]
LFGAIN[1]
LFGAIN[0]
FREE
Free-Run CLAD—Disables the CLAD phase detector in the CLAD, which forces the
numerically controlled oscillator (NCO) to free-run based on the 10 MHz REFCKI input clock
accuracy.
0 = normal (closed loop) CLAD operation
1 = free run (open loop) NCO operation
RSCALE[2:0]
CLAD Reference Scale Factor—Divides CLAD reference signal by 2 [RSCALE] to form
CLADR input to the phase detector. Applicable only if FREE is 0. Allows the system to supply
CLADI frequency, up to a maximum of 128 times the desired CLADR reference frequency.
RSCALE
Scale Factor
CLADR Reference
000
1
2
4
CLADR = CLADI
001
010
011
100
101
110
111
LFGAIN[3:0]
3-4
CLADR = CLADI/2
CLADR = CLADI/4
CLADR = CLADI/8
CLADR = CLADI/16
CLADR = CLADI/32
CLADR = CLADI/64
CLADR = CLADI/128
8
16
32
64
128
Loop Filter Gain— Selects the NCO loop filter's proportional phase error gain. Lower gain
values reduce phase response time, and higher gain values increase phase response time. Note
that loop instability or acquisition failures may result from incorrectly programmed LFGAIN
values.
LFGAIN
Proportional Gain
0000
|
1111
1/20
|
1/215
Conexant
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N8380DSA
4/21/99
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.2 Global Control and Status Registers
03—CLAD Frequency Select (CSEL)
R/W
7
6
5
4
3
2
1
0
VSEL[3]
VSEL[2]
VSEL[1]
VSEL[0]
OSEL[3]
OSEL[2]
OSEL[1]
OSEL[0]
VSEL[3:0]
CLADV Frequency Select—Applicable only if FREE [CLAD_CR; addr 02] is 0. Picks one of
13 CLAD divider chain frequencies to feed back to the phase detector. The selected CLADV
frequency passes to VSCALE for further division before phase detector comparison. Setting
VSEL to invalid values is undefined.
VSEL
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
N8380DSA
4/21/99
CLADV Frequency (kHz)
<Invalid>
1024
2048
1 x E1
2 x E1
4 x E1
8 x E1
16 x E1
1 x T1
2 x T1
4 x T1
8 x T1
16 x T1
4096
8192
16,384
32,768
1544
3088
6176
12,352
24,704
2560
1536
<Invalid>
1 x T1 (unframed)
<Invalid>
Conexant
Advance Information
3-5
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.2 Global Control and Status Registers
OSEL[3:0]
CLADO Frequency Select—Picks one of 14 CLAD divider chain frequencies to output on the
CLADO pin.
OSEL
CLADO Frequency (kHz)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
8
1024
2048
4096
1 x E1
2 x E1
4 x E1
8 x E1
16 x E1
1 x T1
2 x T1
4 x T1
8 x T1
16 x T1
8192
16,384
32,768
1544
3088
6176
12,352
24,704
2560
1536
1 x T1(unframed)
<Invalid>
<Invalid>
04—CLAD Phase Detector Scale Factor (CPHASE)
R/W
7
6
5
4
3
2
1
0
—
—
—
—
—
VSCALE[2]
VSCALE[1]
VSCALE[0]
VSCALE[2:0]
CLAD Variable Scale Factor—Divides CLADV signal by 2 [VSCALE] before use in the phase
detector. Applicable only if FREE [CLAD_CR; addr 02] is 0. Allows the system to select
CLADV frequency that is up to 128 times CLADR.
VSCALE
000
001
010
011
100
101
110
111
3-6
Scale Factor
1
2
4
8
16
32
64
128
Phase Detector Variable Input
CLADV selected by VSEL [addr 03]
CLADV/2
CLADV/4
CLADV/8
CLADV/16
CLADV/32
CLADV/64
CLADV/128
Conexant
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N8380DSA
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CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.2 Global Control and Status Registers
05—CLAD Test (CTEST)
R/W
7
6
5
4
3
2
1
0
CTEST[7]
CTEST[6]
CTEST[5]
CTEST[4]
CTEST[3]
CTEST[2]
CTEST[1]
CTEST[0
Factory use only. Must be remain at default value, 00.
06—CLAD Status (CSTAT)
R
7
6
5
4
3
2
1
0
—
—
—
CPDERR
—
—
—
CPD_INT
CPDERR
CLAD Phase Detector Error—Real-time indicator of the CLAD phase detector status.
CPDERR indicates when the CLADO loses lock with respect to the selected CLADI reference
clock.
0 = CLAD Phase Detector is in lock
1 = CLAD Phase Detector is out of lock
CPD_INT
CLAD Phase Detector Error Interrupt—Indicates a change in status of CPDERR. CPD_INT is
latched high upon a change in status of CPDERR and held until read clear.
07—(FREG)
R/W
7
6
5
4
3
2
1
0
F_OP[1]
F_OP[0]
—
F_ADDR[4]
F_ADDR[3]
F_ADDR[2]
F_ADDR[1]
F_ADDR[0]
Factory use only. Must be remain at default value, 00.
08—(TESTA1)
R/W
7
6
5
4
3
2
1
0
A_TEST[7]
A_TEST[6]
A_TEST[5]
A_TEST[4]
A_TEST[3]
A_TEST[2]
A_TEST[1]
A_TEST[0]
Factory use only. Must be remain at default value, 00.
09—(TESTA2)
R/W
7
6
5
4
3
2
1
0
A_TEST[15]
A_TEST[14]
A_TEST[13]
A_TEST[12]
A_TEST[11]
A_TEST[10]
A_TEST[9]
A_TEST[8]
Factory use only. Must be remain at default value, 00.
N8380DSA
4/21/99
Conexant
Advance Information
3-7
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.2 Global Control and Status Registers
0A—(FUSE_CH1)
R/W
7
6
5
4
3
2
1
0
F_TR[5]
—
—
F_TR[4]
F_TR[3]
F_TR[2]
F_TR[1]
F_TR[0]
Factory use only. Must be remain at default value, 00.
0B—(FUSE_CH2)
R/W
7
6
5
4
3
2
1
0
—
—
—
F_TR[10]
F_TR[9]
F_TR[8]
F_TR[7]
F_TR[6]
Factory use only. Must be remain at default value, 00.
0C—(FUSE_CH3)
R/W
7
6
5
4
3
2
1
0
—
—
—
F_TR[15]
F_TR[14]
F_TR[13]
F_TR[12]
F_TR[11]
Factory use only. Must be remain at default value, 00.
0D—(FUSE_CH4)
R/W
7
6
5
4
3
2
1
0
—
—
—
F_TR[20]
F_TR[19]
F_TR[18]
F_TR[17]
F_TR[16]
Factory use only. Must be remain at default value, 00.
0E—(FUSE_RES)
R/W
7
6
5
4
3
2
1
0
PREVIEW
—
F_TR[26]
F_TR[25]
F_TR[24]
F_TR[23]
F_TR[22]
F_TR[21]
Factory use only. Must be remain at default value, 00.
3-8
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N8380DSA
4/21/99
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.2 Global Control and Status Registers
0F—(TESTD)
R/W
7
6
5
4
3
2
1
0
D_CTL[2]
D_CTL[1]
D_CTL[0]
D_CH[1]
D_CH[0]
D_MD[2]
D_MD[1]
D_MD[0]
Factory use only. Must be remain at default value, 00.
N8380DSA
4/21/99
Conexant
Advance Information
3-9
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.3 Per Channel Registers
3.3 Per Channel Registers
10, 20, 30, 40—Jitter Attenuator Configuration (JAT_CR)
R/W
7
6
5
4
3
2
1
0
T1/E1
—
JEN
JDIR
JCENTER
JSIZE[2]
JSIZE[1]
JSIZE[0]
T1/E1
T1/E1 Select—Enables receive and transmit circuits to operate at either the T1 or E1 line rate.
All configuration register settings should be re-initialized after changing the T1/E1 control bit.
T1/E1 selects the nominal line rate (shown below), while the exact receive and transmit line
rate frequencies are independently determined by their respective input clock or data
references. The actual receive and transmit line frequency can vary within defined tolerances.
0 = 2.048 MHz line rate (E1)
1 = 1.544 MHz line rate (T1)
JEN
Jitter Attenuator Enable—JEN enables the JAT in the receive or the transmit path (determined
by JDIR bit).
0 = Disable JAT
1 = Enable JAT
JDIR
Select JAT Path—Applicable only when the JAT is enabled (see JEN description). JAT elastic
store is placed in either the receive or transmit path.
0 = JAT in TX path
1 = JAT in RX direction, jitter attenuated recovered clock output on RCKO
JCENTER
Force JAT to Center—Writing a 1 to JCENTER resets the elastic store write pointer and forces
the elastic store read pointer to one-half the programmed JSIZE. JCENTER is typically written
at power-up. JCENTER can optionally be asserted after recovery from a loss of signal (RLOS
or RALOS) or in response to a transmit loss of clock (TLOC), or after recovering from a
persistent JAT elastic store error (JERR). The JCENTER bit is self clearing.
0 = normal operation
1 = recenter JAT elastic store
JSIZE[2:0]
JAT Elastic Store Size—Selects the maximum depth of the JAT elastic store. The 32-bit depth
is sufficient to meet jitter attenuation requirements in all cases where the JAT cutoff frequency
is programmed at 6 Hz. However, in cases where an external reference is selected or a narrow
loop bandwidth is programmed, the elastic store depth can tolerate up to ±64 UI (128 bits) of
accumulated phase offset.
JSIZE
000
001
010
011
1xx
3-10
Elastic Store Size
8 Bits
16 Bits
32 Bits
64 Bits
128 Bits
Conexant
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N8380DSA
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CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.3 Per Channel Registers
11, 21, 31, 41—Receiver Configuration (RLIU_CR)
R/W
7
6
5
4
3
2
1
0
UNIPOLAR
ZCS
CLK_POL
RAWMD
EQ_DIS
ATTN
—
SQUELCH
UNIPOLAR
Unipolar Mode—Selects between unipolar and bipolar modes for digital transmit and receive
signals.
In unipolar mode, RPOSO/RNEGO signals are replaced by RDATO/BPV signals. AMI
encoded received data is decoded and output on RDATO in unipolar, NRZ format; and BPV
indicates that the currently received bit is a bipolar violation. TPOSI is replaced with TDATI
and accepts unipolar, NRZ formatted transmit data. TNEGI is not used in this mode. In
unipolar mode, ZCS can replace AMI encoding. Refer to the ZCS bit description below.
In bipolar mode, RPOSO/RNEGO signals output received data in bipolar dual-rail format,
where a high level on RPOSO indicates receipt of a positive AMI pulse, and a high level on
RNEGO indicates receipt of a negative AMI pulse on RTIP/RING inputs. TPOSI/TNEGI
inputs accept bipolar dual-rail transmit data, where a high on TPOSI causes a positive output
pulse on XTIP/XRING, and a high on TNEGI causes a negative output pulse.
0 = Digital transmit/receive signals are bipolar, dual-rail
1 = Digital transmit/receive signals are unipolar, NRZ
ZCS
Zero Code Suppression Enable—Enables HDB3 or B8ZS zero code suppression
encoding/decoding on digital transmit and receive signals and is only applicable if unipolar
mode is selected. In T1 mode (T1/E1 = 1) [addr n0], B8ZS encoding/decoding is selected. In
E1 mode (T1/E1 = 0), HDB3 encoding/decoding is selected.
In the transmit direction, the ZCS encoder replaces sequences of eight or four 0s with a
recoverable code. In the receive direction, the ZCS decoder replaces received codes with eight
0s in T1 mode, or four 0s in E1 mode. The B8ZS code is 000VB0VB and the HDB3 code is
X00V; where B is a normal AMI pulse, V is a bipolar violation, and X is a “don't-care.” These
are standard T1 and E1 line code options.
0 = ZCS encode/decode disabled
1 = ZCS encode/decode enabled
CLK_POL
Clock Polarity—Selects the digital receive data clocking edge. Normally, RPOSO/RNEGO is
output on the rising edge of RCKO. If CLK_POL is set to 1, RPOSO/RNEGO is output on the
falling edge of RCKO.
0 = Data out on rising RCKO
1 = Data out on falling RCKO
RAWMD
Raw Receive Mode—RPOSO/RNEGO data outputs are replaced by the data slicer output, and
RCKO is replaced by the logical OR of RPOSO/RNEGO. A high on RPOSO indicates a
positive pulse, and a high on RNEGO indicates a negative pulse on RTIP/RRING line inputs.
0 = Normal receiver output
1 = Slicer data output enabled
EQ_DIS
Equalizer Disable—Disables the receiver equalizer. (Test mode only)
0 = Equalizer enabled
1 = Equalizer disabled
ATTN
Bridge Attenuation—Compensates for 20 dB resistive signal attenuation caused by placement
of bridge resistors in series with the normal receive termination resistance. Also, in this mode a
lower threshold for RALOS is selected to compensate for the 20 db attenuation.
0 = Normal receiver input levels
1 = 20 dB compensation enabled
N8380DSA
4/21/99
Conexant
Advance Information
3-11
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.3 Per Channel Registers
SQUELCH
Enable Receive Signal Squelch—The digital receiver outputs, RPOSO/RNEGO, are forced to
zero when RALOS is declared. SQUELCH is useful in attached framer applications to allow
the framer to detect LOS during an RALOS condition.
0 = Normal
1 = Squelch RPOSO/RNEGO outputs upon RALOS detect
12, 22, 32, 42 —Transmitter Configuration (TLIU_CR)
R/W
7
6
5
4
3
2
1
0
ALT_TR
TERM
PDN
T_BOOST
PPT
PULSE[2]
PULSE[1]
PULSE[0]
ALT_TR
Alternate Transformer Select—Adjusts the transmit output level for one of two possible
transmitter transformer turns ratios. Normally, a turns ratio of 1:2 for the transmitter is used.
An alternate transformer with turns ratio of 1:1.36 can be selected to minimize power
dissipation
0 = Normal transformer (1:2)
1 = Alternate transformer (1:1.36)
TERM
Transmitter Termination Select—Adjusts the transmit XTIP/XRING output amplitude to
compensate for the presence of an optional external termination resistor. The external resistor
is placed in parallel across XTIP/XRING on systems that must meet transmitter return loss
requirements. Refer to Figure 2-7, Transmit Termination Components, for resistor placement.
Refer to Tables 2-4 through 2-8 for return loss values.
0 = no external transmit termination resistor used
1 = external transmit termination resistor used
PDN
Power Down—Unused channels can be put into a low power mode in order to minimize power
dissipation. In low power mode, XTIP/XRING, RPOSO/RNEGO, and RCKO outputs are
three-stated. All other receiver functions are not affected.
0 = Channel is disabled, low power mode
1 = Channel is enabled, normal operation
T_BOOST
Transmit Level Boost—Adjusts the transmit output level to compensate for series resistance
added to the output by surge protection circuitry. Typical resistance values are 5.6 ohms in
series with line side XTIP and XRING signals.
0 = No compensation
1 = Compensation enabled
PPT
Programmed Pulse Template—Enables custom transmit pulse transmission. The programmed
pulse shape stored in the corresponding shape register, SHAPEn [addr n8 – nF], is used for
transmission.
0 = Pulse template selected by PULSE(2:0)
1 = Programmed pulse template selected
3-12
Conexant
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N8380DSA
4/21/99
CN8380
3.0 Registers
Quad T1/E1 Line Interface
PULSE[2:0]
3.3 Per Channel Registers
Transmit Pulse Template Select—Each positive or negative pulse output on XTIP/XRING is
shaped to meet the transmit pulse template according to the selected cable length and type.
Custom shape programming for alternative cable types or pulse templates can be set using the
SHAPE0–SHAPE7 registers [addr n8 – nF].
PULSE
000
001
010
011
100
101
110
111
Cable Length
0–133 ft.
133–266 ft.
266–399 ft.
399–533 ft.
533–655 ft.
ITU–T G.703
ITU–T G.703
I.431 ISDN
Cable Type
100 Ω Twisted Pair
100 Ω Twisted Pair
100 Ω Twisted Pair
100 Ω Twisted Pair
100 Ω Twisted Pair
75 Ω Coaxial Cable
120 Ω Twisted Pair
100 Ω Twisted Pair
Application
T1 DSX
T1 DSX
T1 DSX
T1 DSX
T1 DSX
E1
E1
T1 CSU/NCTE
13, 23, 33, 43—LIU Control (LIU_CTL)
R/W
7
6
5
4
3
2
1
0
AISCLK
AUTO_AIS
TAIS
LLOOP
RLOOP
TAIS_PE
LLOOP_PE
RLOOP_PE
AISCLK
Enable Automatic ACKI Switching—If AISCLK is active, the transmitter clock is
automatically switched to reference TACKI (T1) or EACKI (E1) instead of TCLK when
transmitting AIS (all 1s) data. Set AISCLK only if the system supplies an alternate line rate
clock on the TACKI or EACKI pins. Also refer to description of AUTO_AIS/TAIS below.
0 = TACKI/EACKI is not used to transmit AIS
1 = TACKI/EACKI is used to transmit AIS
AUTO_AIS
Automatic Transmit Alarm Indication Signal
TAIS
Manual Transmit Alarm Indication Signal—When activated manually (TAIS) or automatically
(AUTO_AIS), the AIS generator replaces all data output on XTIP/XRING with an unframed
all-1s signal (AIS). This includes replacing data supplied from TPOSI/TNEGI and from the
receiver during Remote Line Loopback. Automatic mode sends AIS for the duration of
transmit loss of clock [TLOC; addr n5]. If AISCLK is enabled, the transmit clock is switched
to use TACKI or EACKI to transmit AIS.
N8380DSA
4/21/99
Conexant
Advance Information
3-13
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.3 Per Channel Registers
AIS transmission does not affect transmit data that is looped back to the receiver during
Local Digital Loopback. This allows Local Digital Loopback to be active simultaneously with
the transmission of AIS. If TAIS is activated when RLOOP is enabled, AIS is transmitted using
the jitter-attenuated received clock. Refer to the descriptions of RLOOP and LLOOP below.
Table 3-2 lists transmitter operating modes resulting from various configuration settings and
input conditions.
Table 3-2. Transmitter Operating Modes
Configuration and Input Status
Transmitter Mode
Transmit
Data
Transmit
Clock
RLOOP
TLOC
TAIS
AUTO_AIS
AISCLK
0
X
0
0
X
Tx Data
TCLK
0
X
1
X
0
AIS
TCLK
0
X
1
X
1
AIS
TACKI/EACKI
0
0
0
1
X
Tx Data
TCLK
0
1
0
1
0
AIS
TCLK
0
1
0
1
1
AIS
TACKI/EACKI
1
X
0
X
X
Rx Data
RCLK
1
X
1
X
X
AIS
RCLK
Note:
X is don’t-care.
LLOOP
Local Analog Loopback—Bipolar data from XTIP/XRING is internally connected to
RTIP/RRING inputs. Externally applied data on RTIP/RRING inputs is ignored.
XTIP/XRING output data is unaffected. Asserting both LLOOP and RLOOP activates Local
Digital Loopback. Refer to the RLOOP description below.
RLOOP
Remote Line Loopback—Dual-rail bipolar data from the receiver (or receive JAT) is internally
connected to the transmitter (or transmit JAT). The recovered clock from the RPLL (or JCLK)
is also looped to provide the transmit clock. Loopback data retains BPV transparency.
Received data is allowed to pass to the RZCS decoder, and digital outputs are unaffected.
Asserting both LLOOP and RLOOP activates LDL. Dual-rail bipolar data from the TZCS
encoder (or transmit jitter attenuator) is internally connected to the RZCS decoder (or receive
jitter attenuator) inputs. The transmit clock, TCLK, is also looped to provide the receive clock,
RCKO. Externally applied data on RTIP/RRING inputs are blocked; however, RLOS and
RALOS detect circuitry continues to operate and report receive signal status. XTIP/XRING
output data is unaffected.
LLOOP
0
0
1
1
TAIS_PE
3-14
RLOOP
0
1
0
1
Loopback
No loopback
Remote Line Loopback
Local Analog Loopback
Local Digital Loopback
TAIS Pin Enable—Allows the use of the TAIS hardware pin instead of the TAIS register bit to
manually transmit AIS.
0 = Use TAIS register bit
1 = Use TAIS pin
Conexant
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CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.3 Per Channel Registers
LLOOP_PE
LLOOP Pin Enable—Allows the use of the LLOOP hardware pin instead of the LLOOP
register bit to control loopbacks.
0 = Use LLOOP register bit
1 = Use LLOOP pin
RLOOP_PE
RLOOP Pin Enable—Allows the use of the RLOOP hardware pin instead of the RLOOP
register bit to control loopbacks.
0 = Use RLOOP register bit
1 = Use RLOOP pin
15, 25, 35, 45—Alarm Status (ALARM)
R
7
6
5
4
3
2
1
0
RALOS
RLOS
TLOC
TLOS
TSHORT
JERR
BPV
—
RALOS
Receive Analog Loss of Signal Detect—Indicates receiver analog loss of signal.
RLOS
Receive Loss of Signal Detect—Indicates receiver loss of signal.
TLOC
Transmit Loss of Clock Detect—Indicates loss of transmit clock, TCLK.
TLOS
Transmit Loss of Signal Detect—Indicates a transmitter signal fault detected by the DPM.
TSHORT
Transmit Short Circuit Detect—Indicates transmitter output overload.
JERR
Jitter Attenuator Error Detect—Indicates jitter attenuator FIFO overflow or underrun.
BPV
Bipolar Violation Detect—Indicates a bipolar violation error. If ZCS encoding/decoding is
enabled, BPV is asserted only for bipolar violations which are not part of the ZCS code.
N8380DSA
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3-15
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.3 Per Channel Registers
16, 26, 36, 46—Interrupt Status Register (ISR)
An Interrupt Status register (ISR) bit is latched active (high) whenever its corresponding interrupt source
[ALARM; addr n5] reports an interrupt event. All latched ISR bits are cleared when ISR is read. If the
corresponding interrupt enable [IER; addr n7] is active (high), each interrupt event forces the IRQ output pin
active (low).
ISR reports an interrupt event when an alarm status [ALARM; addr n5] changes from inactive to active
(rising edge) or from active to inactive (falling edge). The associated real-time alarm status must be read to
determine the current alarm state.
R
7
6
5
4
3
2
1
0
RALOS
RLOS
TLOC
TLOS
TSHORT
JERR
BPV
—
RALOS
Receive Analog Loss of Signal—Indicates receiver analog loss of signal status change.
RLOS
Receive Loss of Signal—Indicates receiver loss of signal status change.
TLOC
Transmit Loss of Clock—Indicates transmitter loss of clock status change.
TLOS
Transmit Loss of Signal—Indicates transmitter output signal fault status change.
TSHORT
Transmit Short Circuit—Indicates transmitter loss of analog signal status change.
JERR
Jitter Attenuator Error— Indicates JAT FIFO empty/full status change.
BPV
Bipolar Violation— Indicates a non-zero code bipolar violation status change.
17, 27, 37, 47—Interrupt Enable Register (IER)
R/W
7
6
5
4
3
2
1
0
RALOS
RLOS
TLOC
TLOS
TSHORT
JERR
BPV
—
RALOS
Enables Receive Analog Loss Of Signal
RLOS
Enables Receive Loss Of Signal
TLOC
Enables Transmit Loss Of Clock
TLOS
Enables Transmit Loss Of Signal
TSHORT
Enables Transmit Short Circuit
JERR
Enables Jitter Attenuator Error
BPV
Enables Bipolar Violation
3-16
Conexant
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CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.4 Transmitter Shape Registers
3.4 Transmitter Shape Registers
The following SHAPE registers allow custom programming of the transmit signal pulse shapes. Each set of
eight registers determines the shape for its corresponding channel. A channel [n] is configured to use custom
shapes by first programming the eight SHAPE[n] registers, then setting register bit PPT [addr n1]. For more
information on transmitter functionality, refer to Section 2.4, Transmitter.
18 - 1F—Transmit PULSE Shape CONFIGURATION (SHAPE1)
R/W
7
6
5
4
3
2
1
0
—
—
—
SHAPE[4]
SHAPE[3]
SHAPE[2]
SHAPE[1]
SHAPE[0]
28 - 2F—Transmit PULSE Shape CONFIGURATION (SHAPE2)
R/W
7
6
5
4
3
2
1
0
—
—
—
SHAPE[4]
SHAPE[3]
SHAPE[2]
SHAPE[1]
SHAPE[0]
38 - 3F—Transmit PULSE Shape CONFIGURATION (SHAPE3)
R/W
7
6
5
4
3
2
1
0
—
—
—
SHAPE[4]
SHAPE[3]
SHAPE[2]
SHAPE[1]
SHAPE[0]
48 - 4F—Transmit PULSE Shape CONFIGURATION (SHAPE4)
R/W
7
6
5
4
3
2
1
0
—
—
—
SHAPE[4]
SHAPE[3]
SHAPE[2]
SHAPE[1]
SHAPE[0]
50—(TESTA3)
R/W
7
6
5
4
3
2
1
0
A_TEST[23]
A_TEST[22]
A_TEST[21]
A_TEST[20]
A_TEST[19]
A_TEST[18]
A_TEST[17]
A_TEST[16]
Factory use only. Must be remain at default value, 00.
N8380DSA
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3-17
CN8380
3.0 Registers
Quad T1/E1 Line Interface
3.4 Transmitter Shape Registers
51—(TESTA4)
R/W
7
6
5
4
3
2
1
0
A_TEST[31]
A_TEST[30]
A_TEST[29]
A_TEST[28]
A_TEST[17]
A_TEST[16]
A_TEST[15]
A_TEST[14]
Factory use only. Must be remain at default value, 00.
3-18
Conexant
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N8380DSA
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4
4.0 Electrical/Mechanical
Specifications
This chapter contains the following sections:
• Absolute Maximum Ratings
• Recommended Operating Conditions
• DC Characteristics
• Performance Characteristics
• AC Characteristics
• Packaging
4.1 Absolute Maximum Ratings
Table 4-1. Absolute Maximum Ratings
Symbol
VDD
∆VDD
Parameter
Power Supply (measured to GND)
Minimum
Maximum
Units
–0.5
5.0
V
0.5
V
VDD + 0.5
V
±2
± 700
±200
kV
V
V
Voltage Differential (between any 2 VDD pins)
Vi
Constant Voltage on any Signal Pin
ESD
Transient Voltage on any Signal Pin
HBM rating
CDM rating
MMM rating
–1.0
Ii
Constant Current on any Signal Pin
–10
+10
mA
LATCHUP
Transient Current on any Signal Pin
Digital Pins
Analog Pins (TIP, RING)
–400
–400
+400
+400
mA
mA
Ts
Storage Temperature
–65
150
°C
Tj
Junction Temperature: (θjA x VDD x IDD) + Tamb
–40
125
°C
Tvsol
Vapor Phase Soldering Temperature (1 minute)
220
°C
θJA
Thermal Resistance (128 MQFP), Still Air
36
°C
/W
Stresses above those listed here may cause permanent damage to the device. This is a stress rating only,
and functional operation of the device at these or any other conditions beyond those indicated in the other
sections of this document is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
N8380DSA
Conexant
Advance Information
4-1
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.2 Recommended Operating Conditions
4.2 Recommended Operating Conditions
Table 4-2. Recommended Operating Conditions
Symbol
Minimum
Maximum
Units
Supply voltage
3.14
3.47
V
ESD Rail
3.14
5.25
V
Tamb
Ambient operating temperature
–40
+85
°C
Vih(1)
Input high voltage
2.0
VGG + 0.5
V
Vil
Input low voltage
–0.5
0.8
V
VDD, VAA, VAAT,
VAAR, VAACC
VGG(1)
Parameter
NOTE(S):
(1) VGG is normally connected to VDD. VGG is connected to + 5 V supply if input signals are 5 V logic.
4-2
Conexant
Advance Information
N8380DSA
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.3 DC Characteristics
4.3 DC Characteristics
Table 4-3. DC Characteristics
Symbol
Minimum
Typical
Maximum
Units
Supply current (all channels in low power
mode, PDN [TLIU_CR; addr n2])
60
—
—
mA
Supply current (50% 1s, all channels
enabled, includes transmit load current)
—
200
—
mA
Supply current (all 1s, all channels enabled,
includes transmit load current)
—
—
650
mA
Device power dissipation (all channels in low
power mode, PDN [TLIU_CR; addr n2])
0.2
—
—
W
Device power dissipation (50% 1s, all
channels enabled)
—
0.5
—
W
Device power dissipation (all 1s, all channels
enabled)
—
—
1.25
W
Voh
Output high voltage (Ioh = – 400 µA)
2.5
—
—
V
Vol
Output low voltage (Ioh = – 400 µA)
—
—
1.0
V
Vih
Input high voltage
2.0
—
VGG + 0.5
V
Vil
Input low voltage
–0.5
—
0.8
V
Ipr
Resistive pull-up current
40
100
500
µA
Il
Input leakage current
–10
1
10
µA
Ioz
Three-state leakage current
–10
1
10
µA
Cin
Input capacitance (f = 1 MHz)
—
2
5
pF
Cout
Output capacitance
—
2
5
pF
Cld
Capacitive loading (test condition)
—
70
85
pF
Iosc
Short circuit output current (except
XTIP/XRING)
37
50
160
mA
IDD
PD
N8380DSA
Parameter
Conexant
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4-3
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.4 Performance Characteristics
4.4 Performance Characteristics
Table 4-4. Performance Characteristics
Parameter
Minimum
Typical
Maximum
Units
Receiver
T1 receiver sensitivity (attenuation @ 772 kHz)
+3
—
–12
dB
E1 receiver sensitivity (attenuation @ 1024 kHz)
+3
—
–12
dB
10
6
TBD
12
10
kΩ
V
dB
–0.1
–0.4
75
—
—
100
+0.3
+0.4
bits
kHz
kHz
Receive noise immunity (SNR)
Near-end crosstalk (215 PRBS)
60 Hz longitudinal
Gaussian white noise
—
—
—
15
18
TBD
18
20
TBD
dB
dB
dB
RCKO intrinsic jitter with JAT disabled
—
—
0.125
UI P-P
RCKO intrinsic jitter with JAT enabled
—
—
0.05
UI P-P
10
—
—
2.7
100
1
2
3.0
—
—
50
3.3
kΩ
kΩ
mA
V
2.14
2.7
–10
—
2.37
3.0
—
TBD
2.6
3.3
+10
—
V
V
%
dB
RTIP[n]. RRING[n] inputs:
Input impedance (unterminated)
Peak-to-peak voltage (differential)
Return loss
Receive clock recovery (PLL)
Consecutive zeros tolerance before loss of lock
T1 frequency lock range
E1 frequency lock range
23
Transmitter
Transmitter XTIP[n], XRING[n] outputs:
Output impedance (XOE = 1, high impedance)
Output impedance (XOE = 0, unterminated)
Short circuit current into 1 Ω load
T1 pulse amplitude, 100 Ω UTP(1)
E1 pulse amplitude, 75 Ω coax(1)
E1 pulse amplitude, 120 Ω UTP(1)
Positive/negative pulse imbalance
Return loss
Transmitter signal power level (3 kHz band):
Power @ 772 kHz
Power @ 1544 kHz (relative to power @ 772 kHz)
12
15
–25
–36
+19
—
dBm
dB
Transmitter output intrinsic jitter with JAT disabled
—
—
0.125
UI
Transmitter output intrinsic jitter with JAT enabled
—
—
0.05
UI
NOTE(S):
(1) These values are measured on the line side of the transformer with an appropriate value load resister in place of a cable.
4-4
Conexant
Advance Information
N8380DSA
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.5 AC Characteristics
4.5 AC Characteristics
This section provides details about the following timing features:
• XOE
• RESET
• CLAD
• Receiver signals
• Transmitter signals
• Host serial port
• JTAG interface
Table 4-5. XOE Timing Parameters
Symbol
Parameter
Minimum
Maximum
Units
1
XOE[n] high to XTIP[n]/XRING[n] three-state
20
ns
2
XOE[n] low to XTIP[n]/XRING[n] active
20
ns
NOTE(S): See Figure 4-1.
Figure 4-1. XOE Timing Diagram
XOE [n]
1
2
XTIP[n],
XRING[n]
8380_016
N8380DSA
Conexant
Advance Information
4-5
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.5 AC Characteristics
Table 4-6. RESET Timing Parameters
Symbol
Parameter
Minimum
Maximum
500
Units
1
RESET pulse width
ns
2
RESET low to output signals three-state
20
ns
3
RESET[n] high to output signals active
20
ns
NOTE(S):
1. Output signals: RCKO[n], RPOSO[n], RNEGO[n], XTIP[n], XRING[n], CLK1544, CLK2048, CLADO, RLOS[n], JATERR[n],
TDO, SDO, IRQ
2. See Figure 4-2.
Figure 4-2. RESET Timing Diagram
1
RESET
2
Output
Signals
3
Three-State
8380_017
4-6
Conexant
Advance Information
N8380DSA
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.5 AC Characteristics
Table 4-7. CLAD Timing Parameters
Symbol
Parameter
Minimum
Maximum
Units
1
REFCKI frequency
9.999
10.001
MHz
—
CLADI frequency
8
16,384
kHz
2
Duty cycle
REFCKI, CLADI
40
60
%
3
Rise/fall time (10% to 90%)
REFCKI, CLADI
—
20
ns
1
CLADO frequency
8
16,384
MHz
1
CLK32 frequency
32.768
(Locked to CLAD reference)
MHz
1
CLK1544 frequency
1.544
(Locked to CLAD reference)
MHz
1
CLK2048 frequency
2.048
(Locked to CLAD reference)
MHz
2
Duty cycle
CLADO, CLK32, CLK1544, CLK2048
45
55
%
3
Rise/fall time
CLADO, CLK32, CLK1544, CLK2048
—
20
ns
NOTE(S): See Figure 4-3.
Figure 4-3. CLAD Timing Diagram
1
2
2
90%
10%
3
8380_018
N8380DSA
Conexant
Advance Information
4-7
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.5 AC Characteristics
Table 4-8. Receiver Signals Timing Parameters
Symbol
Parameter
Minimum
Maximum
Units
1
RCKO[n] frequency
1,544 or 2,048
(Locked to line rate)
kHz
2/1
RCKO[n] duty cycle
45
55
%
—
Rise/fall time (10% to 90%)
RCKO[n], RPOSO[n], RNEGO[n], RDATO[n], BPV[n]
—
20
ns
3
RCKO[n] (rising or falling edge) to data valid
—
20
ns
NOTE(S): See Figure 4-4.
Figure 4-4. Receiver Signals Timing Diagram
1
RCKO[n]
(CLK_POL = 0)
2
3
RPOSO[n],
RNEGO[n],
RDATO[n],
BPV[n]
RCKO[n]
(CLK_POL = 1)
8380_019
4-8
Conexant
Advance Information
N8380DSA
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.5 AC Characteristics
Table 4-9. Transmitter Signals Timing Parameters
Symbol
Parameter
Minimum
Maximum
Units
TCLK[n] frequency (input or output)
1.5
2.1
MHz
2/1
TCLK[n] duty cycle (input)
20
80
%
2/1
TCLK[n] duty cycle (output)
45
55
%
—
Rise/fall time (10% to 90%)
TCLK[n], TPOSI[n], TNEGI[n], TDATI[n]
—
20
ns
3
Data Input to TCLK[n] falling edge setup time
5
—
ns
4
TCLK[n] falling edge to data input hold time
5
—
ns
1
NOTE(S): See Figure 4-5.
Figure 4-5. Transmitter Signals Timing Diagram
1
TCLK[n]
2
3
4
TPOSI[n],
TNEGI[n],
TDATI[n]
8380_020
N8380DSA
Conexant
Advance Information
4-9
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.5 AC Characteristics
Table 4-10. Host Serial Port Timing Parameters
Symbol
Minimum
Maximum
Units
CS Setup Before SCLK Rising Edge
10
—
ns
SCLK Frequency
—
8
MHz
2
SCLK High Pulse Width
50
—
ns
3
SCLK Low Pulse Width
50
—
ns
4
SDI to SCLK Rising Edge Setup Time
10
—
ns
5
SCLK Rising Edge to SDI Hold Time
5
—
ns
6
SCLK Rising Edge to CS Hold Time
5
—
ns
7
CS Inactive Cycle Time
100
—
ns
8
CS Inactive to SDO Three-State
100
—
ns
9
SCLK Falling Edge to SDO Valid Time
50
ns
—
Rise/Fall Time (10% to 90%)
SCLK, SDI, SDO
20
ns
1
2, 3
Parameter
—
NOTE(S): See Figures 4-6 through 4-8.
Figure 4-6. Host Serial Port Timing Diagram
Read Timing
CS
SCLK
SDI
R / W A0
1
A1
A2
A3
A4
A5
A6
Address/Control Byte
SDO
D0
D1
D2
D3
D4
D5
D6
D7
D6
D7
Register Data Byte
Write Timing
CS
SCLK
SDI
R / W A0
0
A1
A2
A3
A4
A5
A6
D0
Address/Control Byte
D1
D2
D3
D4
D5
Register Data Byte
SDO
8380_021
4-10
Conexant
Advance Information
N8380DSA
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.5 AC Characteristics
Figure 4-7. Host Serial Port Write Timing
CS
1
2
3
6
7
SCLK
4
SDI
5
0
A0
A1
D5
Address/Command
Byte
8380_022
D6
D7
Write Data Byte
Figure 4-8. Host Serial Port Read Timing
CS
1
2
7
3
SCLK
4
SDI
5
1
A0
A1
Address/Command
Byte
SDO
D5
D6
D7
Read Data Byte
8380_023
N8380DSA
8
9
Conexant
Advance Information
4-11
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.5 AC Characteristics
Table 4-11. JTAG Interface Timing Parameters
Symbol
Parameter
Minimum
Maximum
Units
1
TCK pulse width high
80
—
ns
2
TCK pulse width low
80
—
ns
3
TMS, TDI setup to TCK rising edge
20
—
ns
4
TMS, TDI hold after TCK high
20
—
ns
5
TDO hold after TCK falling edge
0
—
ns
6
TDO delay after TCK low
—
50
ns
7
TDO enable (Low Z) after TCK falling edge
2
—
ns
8
TDO disable (High Z) after TCK low
—
25
ns
NOTE(S): See Figure 4-9.
Figure 4-9. JTAG Interface Timing Diagram
TDO
7
5
1
8
6
TCK
3
4
2
TDI
TMS
8380_024
4-12
Conexant
Advance Information
N8380DSA
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.6 Packaging
4.6 Packaging
Figure 4-10. 128-Pin MQFP Mechanical Drawing
E
E1
E2
2.00
PIN 1
REF
2.00
D2 D1 D
D1
PIN 1 REF MARK
b
e
S
Y
M
B
O
L
A
A1
A2
D
D1
D2
E
E1
E2
L
L1
e
b
c
DETAIL A
E1
A
A2
c
A1
L
DETAIL A
L1
MIN.
0.25
2.57
0.73
0.13
0.13
NOM.
3.04
0.33
2.71
23.20 REF.
20.0 REF.
18.5 REF
17.20 RE.
14.0 REF
12.5 REF
0.88
1.6 REF
0.50 BSC
-------
MAX
3.40
2.87
1.03
0.28
0.23
Ref. 128-PIN MQFP (GP00-D448)
8380_027
N8380DSA
ALL DIMENSIONS
IN MILLIMETERS
Conexant
Advance Information
4-13
CN8380
4.0 Electrical/Mechanical Specifications
Quad T1/E1 Line Interface
4.6 Packaging
4-14
Conexant
Advance Information
N8380DSA
A
Appendix A: Applicable Standards
Table A-1. Applicable Standards (1 of 2)
Standard
Title
ANSI
T1.101-1987
Digital Hierarchy—Timing Synchronization
T1.102-1993
Digital Hierarchy—Electrical Interfaces
T1.403-1995
Network to Customer Installation—DS1 Metallic Interface
T1.408-1990
ISDN Primary Rate—Customer Installation Metallic Interfaces
AT&T
TR 41449-1986
ISDN Primary Rate Interface Specification
TR 43801(A)-1985
Digital Channel Bank—Requirements and Objectives
TR 62411-1990
Accunet T1.5 Service Description and Interface Specification
CB 119
Compatibility Bulletin
Bellcore
TR-TSY-000008 Issue 2, 1987
Digital Interface Between the SLC 96 Digital Loop Carrier System and a Local
Digital Switch
TR-TSY-000009 Issue 1, 1986
Asynchronous Digital Multiplexer Requirements and Objectives
TR-NPL-000054 Issue 1, 1989
High-Capacity Digital Service (HCDS) Interface Generic Requirements
TR-NWT-000057 Issue 2, 1993
Functional Criteria for Digital Loop Carrier Systems
TR-TSY-000170 Issue 2, 1993
Digital Cross-Connect System (DCS) Requirements and Objectives
TR-TSY-000191 Issue 1, 1986
Alarm Indication Signal (AIS) Requirements and Objectives
TR-TSY-000303 Issue 2, 1992
Integrated Digital Loop Carrier (IDLC) System Generic Requirements
TR-NPL-000320 Issue 1, 1988
Fundamental Generic Requirements for Metallic Digital Signal Cross-connect Systems
TA-TSY-000435 Issue 1, 1987
DS1 Automatic Facility Protection Switching (AFPS) Rqts. and Objectives
TR-NWT-000499 Issue 5, 1993
Transport Systems Generic Requirements
SR-NWT-002343 Issue 1, 1993
ISDN Primary Rate Interface Guidelines for Customer Premises Equipment
ETSI
ETS 300 011 (4/92)
ISDN Primary Rate User-Network Interface Specification and Test Principles
ETS 300 233
Access Digital Section for ISDN Primary Rate
N8380DSA
Conexant
Advance Information
A-1
CN8380
Appendix A : Applicable Standards
Quad T1/E1 Line Interface
Table A-1. Applicable Standards (2 of 2)
Standard
Title
ITU-T
Recommendation G.703 (1991)
Physical/Electrical Characteristics of Hierarchical Digital Interfaces
Recommendation G.704 (1991)
Synchronous Frame Structures used at Primary Hierarchical Levels
Recommendation G.706 (1991)
Frame Alignment and CRC Procedures Relating to G.704 Frame Structures
Recommendation G.732
Characteristics of Primary PCM Multiplex Equipment at 2048 kbps
Recommendation G.733
Characteristics of Primary PCM Multiplex Equipment at 1544 kbps
Recommendation G.734
Characteristics of Synchronous Digital Multiplex Equipment at 1544 kbps
Recommendation G.735
Characteristics of Primary PCM Multiplex Equipment at 2048 kbps; offering
Synchronous Digital Access at 384 kbps and/or 64 kbps
Recommendation G.736
Characteristics of Synchronous Digital Multiplex Equipment at 2048 kbps
Recommendation G.737
Characteristics of External Access Equipment at 2048 kbps; offering Synchronous
Digital Access at 384 kbps and/or 64 kbps
Recommendation G.738
Characteristics of Primary PCM Multiplex Equipment at 2048 kbps; offering
Synchronous Digital Access at 320 kbps and/or 64 kbps
Draft Recommendation G.775
Loss of Signal (LOS) and Alarm Indication Signal (AIS) Defect Detection
Recommendation G.821
Error Performance Monitoring on International Connections
Recommendation G.823 (3/93)
Control of Jitter and Wander in Digital Networks based on 2048 kbps
Recommendation G.824 (3/93)
Control of Jitter and Wander in Digital Networks based on 1544 kbps
Recommendation I.431
Primary Rate User-Network Interface—Layer 1 Specification
Recommendation K.10
Unbalance about Earth of Telecommunication Installations
Recommendation K.20
Resistibility of Switching Equipment to Overvoltages and Overcurrents
Recommendation M.3604
Application of Maintenance Principles to ISDN Primary Rate Access
IEEE Std 1149.1a-1993
IEEE Standard Test Access Port and Boundary Scan Architecture (JTAG)
FCC Part 68.302 (d)
Environment Simulation Metallic Voltage Surge
FCC Part 68.308
Signal Power Limitations
A-2
Conexant
Advance Information
N8380DSA
B
Appendix B: External Component
Specifications
Table B-1 lists the transformer specifications. Table B-2 lists the REFCKI crystal
oscillator specifications. Figure B-1 illustrates the minimum hardware configuration.
Table B-1. Transformer Specifications
Parameter
RX Value
Turns Ratio
2:1 CT
Pulse Engineering Part Number:
Temp. 0 °C to 70 °C
Octal SMT
Pulse (1) T1124
Serial Resistance
1 Ω maximum
Primary Inductance
OCL 1.2 mH @ 25 °C
Isolation Voltage
1500 Vrms
Leakage Inductance
0.8 µH
TX Value
1:2
Note(s):
(1) Contact Pulse Engineering for other part numbers:
Phone (619) 674-8100
Web: http://www.pulseeng.com
Table B-2. REFCKI (10 MHz) Crystal Oscillator Specifications
Parameter
Value
Nominal Frequency
10 MHz
Frequency Accuracy (E1)
±50 ppm
Frequency Accuracy (T1)
±32 ppm
Output Level (1)
3.3 V Logic, CMOS or TTL
Aging
2 ppm/year, 10 ppm maximum
Note(s):
(1) If the VGG pin is connected to +5 V supply, 5 V logic output may be used. Refer to the
VGG pin description in Chapter 1.0, Pin Descriptions .
N8380DSA
Conexant
Advance Information
B-1
Appendix B: Applications
B-2
B
Figure B-1. Minimum Hardware Configuration
VDD
Hardware Mode
Host Mode
Channel 1 Digital
Interface
65
NC 48
43
NC
NC 44
NC 45
NC 46
NC 114
NC 49
NC 62
NC 63
NC 64
NC 50
NC 47
NC 53
34
33
35
123
NC
119
NC
73
NC
42
NC
108
NC
115
NC
RLOOP[1]
LLOOP[1]
RAWMD[1]
JATERR[1]*
RLOS[1]
TAIS[1]
Channel 1 Line Interface
Programmable
Receive Termination (1)
RTIP[1]
71 470
RRING[1]
XOE[1]
72 470
1:2
RX
66
RJ48C
or
BANTAM
TX
XTIP[1]
TPOSI[1]
TNEGI[1]
TCLK[1]
67
1:2
150 pF
5.6(5)
Optional
Common
Mode Choke
21
68
5.6
CN8380
Quad T1/E1
LIU
Channel 2 Digital Interface
RX
0.1
Smoothing
Capacitor
CN8394
Quad T1/E1
Framer
Fixed Receive
Termination (2)
100
XRING[1]
Conexant
Advance Information
37
36
38
HM
RESET
JDIR(4)
JSEL(2)(4)
JSEL(1)(4)
JSEL(0)
UNIPOLAR
HTERM
PTS(2)
PTS(1)
PTS(0)
CLK_POL
IRQ
ZCS
RPOSO[1]
RNEGO[1]
RCKO[1]
Fixed
Transmit
Termination (3)
(5)
TX
Octal Transformer
Pulse – T1124
Channel 2 Line Interface
Channel 3 Line Interface
Channel 3 Digital Interface
Channel 4 Line Interface
VDD
VAA
VAAT[1:4]
VAAR
VAACL
VGG
Channel 4 Digital Interface
8380_026
SDO(4)
VSS
SDI(4)
Host Mode
GND
SCLK(4) Serial Port GNDT[1:4]
(4)
CS
GNDR
CLADI
GNDCL
REFCKI
EACKI
TACKI
CN8380
N8380DSA
Note(s):
(1) Optional programmable receive termination: 75/100/120 Ω
(2) Required fixed receive termination. The parallel combination of the fixed termination and programmable termination must match the line impedance.
(3) Optional fixed transmit termination. The value shown provides acceptable transmit return loss for T1 and E1 applications. (See Table 2-7, Transmit Termination Option D.)
(4) Pins shown twice for Hardware Mode and Host Mode.
(5) In Hardware Mode, 5.6 Ω line feed resistors are required. In Host Mode, they are optional.
Quad T1/E1 Line Interface
10 MHz
Oscillator
42
44
43
45
1
NC
4
127
128
+3.3 V
C
Appendix C: Acronym List
N8380DSA
4/21/99
Acronym
Definition
AGC
automatic gain control
AIS
alarm indication signal
AMI
alternate mark inversion
ANSI
American National Standards Institute
B8ZS
binary with 8-zero substitution
BABT
British Approvals Board for Telecommunications
BPV
bipolar violation
BSDL
boundary scan description language
CCIR
International Radio Communications Committee
CIF
common interchange format
CLAD
clock rate adapter
CMOS
complementary metal-oxide semiconductor
CRC
cyclic redundancy check
CSU
channel service unit
DAC
digital-to-analog converter
DMA
direct memory access
DPM
driver performance monitor
DSX
digital signal cross connect
ETSI
European Telecommunications Standards Institute
FCC
Federal Communications Commission
FIFO
first-in first-out buffer
GPIO
general purpose input/output
HDB3
high-density bipolar of order 3
HDSL
high bit-rate digital subscriber line
I2C
inter-integrated circuit
ISDN
Integrated Services Digital Network
ITU–T
International Telegraph and Telephone Consultative Committee
JAT
jitter attenuator
JTAG
Joint Test Action Group
LAL
local analog loopback
Conexant
Advance Information
C-1
CN8380
Appendix C : Acronym List
Quad T1/E1 Line Interface
C-2
LDL
local digital loopback
LIU
line interface unit
LOS
loss of signal
MSB
most significant bit
NCO
numerically controlled oscillator
NCTE
network channel-terminating equipment
NRZ
non-return to zero
PCI
peripheral component interconnect
PCM
pulse code modulation
PLL
phase locked loop
MQFP
metric quad flat pack
PRBS
pseudo-random bit sequence
PRI
primary rate interface
RALOS
receive loss of analog input
RLL
remote line loopback
RLOS
receive loss of signal
RPLL
receive phase lock loop
RZCS
receive zero code suppression
SDH
Synchronous Digital Hierarchy
SONET
Synchronous Optical Network
TAP
test access port
TLOC
transmit loss of clock
TLOS
transmit loss of signal
TZCS
transmit zero code suppression
UI
unit interval
UTP
unshielded twisted pair
ZCS
zero code suppression
Conexant
Advance Information
N8380DSA
4/21/99
0.0 Sales Offices
Further Information
[email protected]
1-800-854-8099 (North America)
33-14-906-3980 (International)
Web Site
www.conexant.com
World Headquarters
Conexant Systems, Inc.
4311 Jamboree Road
P. O. Box C
Newport Beach, CA
92658-8902
Phone: (949) 483-4600
Fax: (949) 483-6375
Hong Kong
Phone: (852) 2827 0181
Fax: (852) 2827 6488
India
Phone: (91 11) 692 4780
Fax: (91 11) 692 4712
Korea
Phone: (82 2) 565 2880
Fax: (82 2) 565 1440
Phone: (82 53) 745 2880
Fax: (82 53) 745 1440
Europe Headquarters
U.S. Los Angeles
Phone: (805) 376-0559
Fax: (805) 376-8180
Conexant Systems France
Les Taissounieres B1
1681 Route des Dolines
BP 283
06905 Sophia Antipolis Cedex
FRANCE
Phone: (33 4) 93 00 33 35
Fax: (33 4) 93 00 33 03
U.S. Mid-Atlantic
Phone: (215) 244-6784
Fax: (215) 244-9292
Europe Central
Phone: (49 89) 829 1320
Fax: (49 89) 834 2734
U.S. North Central
Phone: (630) 773-3454
Fax: (630) 773-3907
Europe Mediterranean
Phone: (39 02) 9317 9911
Fax: (39 02) 9317 9913
U.S. Northeast
Phone: (978) 692-7660
Fax: (978) 692-8185
Europe North
Phone: (44 1344) 486 444
Fax: (44 1344) 486 555
U.S. Florida/South America
Phone: (727) 799-8406
Fax: (727) 799-8306
U.S. Northwest/Pacific West
Phone: (408) 249-9696
Fax: (408) 249-7113
U.S. South Central
Phone: (972) 733-0723
Fax: (972) 407-0639
U.S. Southeast
Phone: (919) 858-9110
Fax: (919) 858-8669
U.S. Southwest
Phone: (949) 483-9119
Fax: (949) 483-9090
APAC Headquarters
Conexant Systems Singapore, Pte.
Ltd.
1 Kim Seng Promenade
Great World City
#09-01 East Tower
SINGAPORE 237994
Phone: (65) 737 7355
Fax: (65) 737 9077
Australia
Phone: (61 2) 9869 4088
Fax: (61 2) 9869 4077
China
Phone: (86 2) 6361 2515
Fax: (86 2) 6361 2516
Europe South
Phone: (33 1) 41 44 36 50
Fax: (33 1) 41 44 36 90
Middle East Headquarters
Conexant Systems
Commercial (Israel) Ltd.
P. O. Box 12660
Herzlia 46733, ISRAEL
Phone: (972 9) 952 4064
Fax: (972 9) 951 3924
Japan Headquarters
Conexant Systems Japan Co., Ltd.
Shimomoto Building
1-46-3 Hatsudai,
Shibuya-ku, Tokyo
151-0061 JAPAN
Phone: (81 3) 5371-1567
Fax: (81 3) 5371-1501
Taiwan Headquarters
Conexant Systems, Taiwan Co., Ltd.
Room 2808
International Trade Building
333 Keelung Road, Section 1
Taipei 110, TAIWAN, ROC
Phone: (886 2) 2720 0282
Fax: (886 2) 2757 6760