CN8330
DS3/E3 Framer with 52 Mbps HDLC Controller
The CN8330 is an integral DS3/E3 framer designed to support the transmission
formats defined by ANSI T1.107-1988, T1.107a-1989, T1.404, and ITU-T G.751
standards. All maintenance features required by Bellcore TR-TSY-000009 and AT&T
PUB 54014 are provided. In addition, the CN8330 can be optionally configured as a
High-Level Data Link Controller (HDLC) usable with or without DS3/E3 framing
overhead.
The CN8330 provides framing recovery for M13, C-bit parity, Syntran, and G.751
E3 formatted signals. A First In First Out (FIFO) buffer in the receive path can be
enabled to reduce jitter on the incoming data. Transmit and receive data is available to
the host in either serial or parallel byte and nibble formats. Access is provided to the
terminal data link and the Far End Alarm/Control (FEAC) channel, as specified in
T1.107a-1989. Counters are included for frame-bit errors, Line Code Violations
(LCVs), parity errors, and Far End Block Errors (FEBEs).
Two operational modes are available: microprocessor and stand-alone monitor
control modes. The microprocessor control mode monitors all status conditions and
provides configuration control. The stand-alone monitor mode allows the CN8330 to
operate as a monitor providing status and alarm information on external pins.
Distinguishing Features
•
•
•
•
•
Supports DS3/E3 framing modes
Includes high-speed HDLC controller
(52 MHz)
Framing recovery for M13, C-bit
parity, Syntran, and G.751 E3 signals
Serial or parallel (octet or nibble)
interface modes
Average reframe time of less than
1 ms for DS3 and less than 250 µs
for E3
Supports the LAPD terminal data link
and FEAC channel as defined in
T1.107a-1989
68-pin PLCC or 80-pin MQFP
surface-mount package
Operates from a single +5 VDC ±5%
power supply
Low-power CMOS technology
•
•
•
•
Functional Block Diagram
Applications
•
•
•
•
•
•
•
•
•
Digital PCM switches
Digital Cross-Connect Systems
Channel Service Units (CSUs)
Channel extenders
ATM Switches/Concentrators
PBXs
Switched Multimegabit Digital
Service (SMDS) Equipment
Test equipment
Routers (including HSSI ports)
Bypass
RXPOS
RXNEG
DS3CKI
TXCKI
M
U
X
Unipolar
Conversion
FIFO
Framing
Recovery
RXMSY
CBITO
RXCCK
RXDAT
FIFO
Enable
Source
Loopback
Overhead/
Data Link
Processing
PPDL
Receiver
TXPOS
TXNEG
TCLKO
M
U
X
Bipolar
Encoder
RXCLK
Status
RDAT[7:0]
RXBCK
Status
Framing/
Overhead
Insertion
PPDL
Transmitter
Overhead/
Data Link
Processing
TXBCK
TDAT[7:0]
TXCCK
CBITI
TXCKI
Line
Loopback
AD[7:0]
Control
Microprocessor
Interface
To/From
All Blocks
TXDATI
TXSYI
Data Sheet
100441E
October 13, 1999
Ordering Information
Model Number
CN8330EPJD
CN8330EPD
CN8330 Typical DS3 Application
CN8331
31.6Ω
Package
68-Pin Plastic Leaded Chip Carrier (PLCC)
80-Pin Metric Quad Flat Pack (MQFP)
Ambient Temperature
–40 to 85
°
C
–40 to 85
°
C
CN8330
DS3/E3 Framer
RXPOS
RXNEG
DS3CKI
RDAT[7:0]
RXDAT
RXCLK
RXMSY
8
RLINE1P
RLINE1N
31.6Ω
RPOS1
RNEG1
RCLK1
Receive
Serial
Data
Interface
TPOS1
TLINE1P
37.4Ω
37.4Ω
0.01
TXPOS
TXNEG
TCLKO
RXBCK
TXBCK
TDAT[7:0]
TNEG1
TCLK1
8
Parallel
Data
Interface
(Also used
for HDLC
payload
data)
(M-Sync)
(Data)
(Clock)
8
TDAT7
TLINE1N
TXCKI
TDAT6
Transmit
Serial
Data
Interface
AD[7:0]
RD*
WR*
CS
ALE
MON/MIC*
Microprocessor
Interface
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 products are not designed or intended for use in life support appliances, devices, or systems where malfunction of a
Conexant product can reasonably be expected to result in personal injury or death. Conexant customers using or selling Conexant
products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages resulting from
such improper use or sale.
The trademarks “Conexant” and the Conexant symbol 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
Reader Response:
Conexant strives to produce quality documentation, and welcomes your feedback. Please send
comments and suggestions to
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For technical questions, contact your local
Conexant
sales office
or field applications engineer.
100441E
Conexant
Table of Contents
List of Figures
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
List of Tables
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
1.0
Product Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
Pin Descriptions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2.0
Functional Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1
Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.1
2.1.2
2.1.3
Brief Block Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clock Interface and Initialization
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.2.1
Initialization
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microprocessor Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3.1
Using with Specific Microcontrollers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3.2
Microprocessor Interrupts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3.3
Address Map
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2-3
2-3
2-3
2-3
2-4
2-4
2.2
Line Interfaces
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.2.1
2.2.2
Transmitter Line Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Receiver Line Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Input and Synchronization
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
DS3 Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
E3 Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Framing Bit Generation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Alarm Signal Generation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Terminal Data Link Transmitter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.3.6.1
Sending a Message
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.3.6.2
Aborting a Message
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.3.6.3
Transmitter Interrupts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.3.6.4
Transmitter Control Example
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
TxFEAC Channel Transmission
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
PPDL Transmitter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
PPDLONLY Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Transmitter Outputs
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Test Equipment Specific Features
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.3
Transmitter Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.3.9
2.3.10
2.3.11
100441E
Conexant
i
CN8330
DS3/E3 Framer with 52 Mbps HDLC Controller
2.4
Receiver Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
Bipolar-to-Unipolar Conversion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
Receive FIFO
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
Received Signal Output
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Framing Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
Alarm Detection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
Terminal Data Link Reception
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
2.4.6.1
Receiver Interrupts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28
2.4.6.2
Receiver Response Example
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28
RxFEAC Channel Reception.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
PPDL Receiver
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30
PPDLONLY Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32
Serial C-Bit Output
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
DS3 Monitor Mode Error Outputs
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
2.4.7
2.4.8
2.4.9
2.4.10
2.5
2.5.1
Monitor Mode for Stand-Alone Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34
3.0
Registers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1
Control Registers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
0x00—Mode Control Register (CR00).
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0x01—Terminal Data Link Control Register (CR01)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0x02—Status Interrupt Control Register (CR02)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0x03—Transmit FEAC Channel Byte (CR03)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0x04—Feature Control Register (CR04)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0x05—PPDL Control Register (CR05).
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
3-1
3-3
3-3
3-4
3-4
3-5
Status Registers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
0x10—DS3/E3 Maintenance Status Register (SR00)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
0x11—Counter Interrupt Status Register (SR01).
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
0x12—Data Link Interrupt Status Register (SR02)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
0x13—Receive FEAC Channel Byte (SR03)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
0x14—Terminal Data Link Status Register (SR04)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
0x15—Part Number/Hardware Version Register (SR05)
. . . . . . . . . . . . . . . . . . . . . . . . . 3-9
0x16—Shadow Status Register (SR06)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
0x20–0x26—DS3/E3 Error Counters.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
0x20—DS3 Parity Error Counter (SR07)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
0x21—DS3 Disagreement Counter (SR08)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
0x22—DS3/E3 Frame Error Counter (SR09)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
0x23—DS3 Path Parity Error Counter (SR10)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
0x24—DS3 FEBE Event Counter (SR11)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
0x25,0x26—DS3/E3 LCV Counter—Low and High Bytes (SR12,SR13)
. . . . . . . . . . . . . 3-13
3.3
Memory Registers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
0x30–0x37—Transmit Terminal Data Link Message Buffer (TxTDL)
. . . . . . . . . . . . . . . . 3-14
0x40–0x47—Receive Terminal Data Link Message Buffer (RxTDL)
. . . . . . . . . . . . . . . . 3-14
3.4
Register Summary
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
ii
Conexant
100441E
CN8330
DS3/E3 Framer with 52 Mbps HDLC Controller
4.0
Mechanical/Electrical Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1
4.2
4.3
4.4
Timing Requirements
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Environmental Conditions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.2.1
4.3.1
Power Requirements and Temperature Range
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
DC Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Electrical Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Mechanical Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Appendix A Multimegabit HDLC Formatter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
A.1
A.2
A.3
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Block and Logic Diagrams
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
PPDL Transmitter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
A.3.1
PPDL Receiver
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
Appendix B
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
B.1
B.2
B.3
DS3CKI Clock Duty Cycle
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Overhead Bit Insertion in E3 Parallel Payload Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
HDLC Formatter Mode Support While Configured for E3 Framing
. . . . . . . . . . . . . . . . . . . . . . . B-2
Appendix C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
100441E
Conexant
iii
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