CONEXANT CX06833-42 V.92/v.34/v.32bis modem in 144-pin tqfp with optional cx20442 voice codec Datasheet

CX06833-3x/4x
SMXXD Modem
V.92/V.34/V.32bis Modem in
144-Pin TQFP with Optional
CX20442 Voice Codec
Data Sheet
Doc. No. 102228B
July 1, 2003
CX06833-3x/4x SMXXD Modem Data Sheet
Revision Record
Revision
B
A
Date
7/1/2003
6/13/2003
Comments
Rev. B release.
Initial release.
© 2003 Conexant Systems, Inc.
All Rights Reserved.
Information in this document is provided in connection with Conexant Systems, Inc. (“Conexant”) products. These materials are
provided by Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no
responsibility for errors or omissions in these materials. Conexant may make changes to specifications and product descriptions at
any time, without notice. Conexant makes no commitment to update the information and shall have no responsibility whatsoever for
conflicts or incompatibilities arising from future changes to its specifications and product descriptions.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as
provided in Conexant’s Terms and Conditions of Sale for such products, Conexant assumes no liability whatsoever.
THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
RELATING TO SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO
FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL DAMAGES, MERCHANTABILITY, OR
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DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS
CONTAINED WITHIN THESE MATERIALS. CONEXANT SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL,
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in this publication are for identification purposes only, and may be trademarks of third parties. Third-party brands and names are the
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For additional disclaimer information, please consult Conexant’s Legal Information posted at www.conexant.com, which is
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Reader Response: Conexant strives to produce quality documentation and welcomes your feedback. Please send comments and
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engineer.
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Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Contents
1. Introduction..........................................................................................................................................1-1
1.1
1.2
1.3
1.4
1.5
1.6
Overview ......................................................................................................................................................................... 1-1
Applications .................................................................................................................................................................... 1-2
Features .......................................................................................................................................................................... 1-4
1.3.1
General Modem Features ............................................................................................................................... 1-4
Technical Overview......................................................................................................................................................... 1-5
1.4.1
General Description ........................................................................................................................................ 1-5
1.4.2
MCU Firmware................................................................................................................................................ 1-6
1.4.3
Operating Modes ............................................................................................................................................ 1-6
1.4.3.1
Data/Fax Modes.......................................................................................................................... 1-6
1.4.3.2
V.44 Data Compression.............................................................................................................. 1-7
1.4.3.3
Country Support......................................................................................................................... 1-7
1.4.3.4
TAM Mode.................................................................................................................................. 1-7
1.4.3.5
Speakerphone Mode (S Models)................................................................................................ 1-8
1.4.4
Reference Designs.......................................................................................................................................... 1-9
Hardware Description ..................................................................................................................................................... 1-9
1.5.1
CX06833 Modem Device ................................................................................................................................ 1-9
1.5.2
CX20442 Voice Codec .................................................................................................................................... 1-9
AT Commands .............................................................................................................................................................. 1-10
2. Technical Specifications .......................................................................................................................2-1
2.1
2.2
2.3
102228A
Serial DTE Interface Operation........................................................................................................................................ 2-1
2.1.1
Automatic Speed/Format Sensing .................................................................................................................. 2-1
Parallel Host Bus Interface Operation............................................................................................................................. 2-2
Establishing Data Modem Connections .......................................................................................................................... 2-2
2.3.1
Dialing ............................................................................................................................................................ 2-2
2.3.2
Telephone Number Directory ......................................................................................................................... 2-2
2.3.3
Modem Handshaking Protocol ....................................................................................................................... 2-2
2.3.4
Call Progress Tone Detection ......................................................................................................................... 2-2
2.3.5
Answer Tone Detection .................................................................................................................................. 2-2
2.3.6
Ring Detection................................................................................................................................................ 2-2
2.3.7
Billing Protection ............................................................................................................................................ 2-3
2.3.8
Connection Speeds......................................................................................................................................... 2-3
2.3.9
Automode ....................................................................................................................................................... 2-3
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CX06833-3x/4x SMXXD Modem Data Sheet
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
2.12
2.13
2.14
2.15
2.16
iv
Data Mode ...................................................................................................................................................................... 2-4
2.4.1
Speed Buffering (Normal Mode) .................................................................................................................... 2-4
2.4.2
Flow Control ................................................................................................................................................... 2-4
2.4.3
Escape Sequence Detection ........................................................................................................................... 2-4
2.4.4
BREAK Detection ............................................................................................................................................ 2-4
2.4.5
Telephone Line Monitoring............................................................................................................................. 2-4
2.4.6
Fall Forward/Fallback (V.92/V.90/V.34/V.32 bis/V.32) ................................................................................... 2-4
2.4.7
Retrain ............................................................................................................................................................ 2-5
2.4.8
Programmable Inactivity Timer ...................................................................................................................... 2-5
2.4.9
DTE Signal Monitoring (Serial DTE Interface Only) ........................................................................................ 2-5
V.92 Features.................................................................................................................................................................. 2-5
2.5.1
Modem-on-Hold ............................................................................................................................................. 2-5
2.5.2
Quick Connect ................................................................................................................................................ 2-6
2.5.3
PCM Upstream ............................................................................................................................................... 2-6
Error Correction and Data Compression......................................................................................................................... 2-6
2.6.1
V.42 Error Correction ..................................................................................................................................... 2-6
2.6.2
MNP 2-4 Error Correction .............................................................................................................................. 2-6
2.6.3
V.44 Data Compression.................................................................................................................................. 2-6
2.6.4
V.42 bis Data Compression ............................................................................................................................ 2-6
2.6.5
MNP 5 Data Compression .............................................................................................................................. 2-7
Telephony Extensions..................................................................................................................................................... 2-7
2.7.1
Line In Use Detection ..................................................................................................................................... 2-7
2.7.2
Extension Pickup Detection ............................................................................................................................ 2-7
2.7.3
Remote Hangup Detection ............................................................................................................................. 2-8
Fax Class 1 and Fax Class 1.0 Operation ........................................................................................................................ 2-8
Point-of-Sales Support ................................................................................................................................................... 2-8
Voice/Audio Mode .......................................................................................................................................................... 2-8
2.10.1
Online Voice Command Mode ........................................................................................................................ 2-8
2.10.2
Voice Receive Mode ....................................................................................................................................... 2-8
2.10.3
Voice Transmit Mode ..................................................................................................................................... 2-9
2.10.4
Full-Duplex Receive and Transmit Mode........................................................................................................ 2-9
2.10.5
Audio Mode .................................................................................................................................................... 2-9
2.10.6
Tone Detectors ............................................................................................................................................... 2-9
2.10.7
Speakerphone Mode....................................................................................................................................... 2-9
V.80 Synchronous Access Mode (SAM) - Video Conferencing ...................................................................................... 2-9
Full-Duplex Speakerphone (FDSP) Mode (S Models)................................................................................................... 2-10
Caller ID ........................................................................................................................................................................ 2-10
Worldwide Country Support ......................................................................................................................................... 2-10
Diagnostics ................................................................................................................................................................... 2-11
2.15.1
Commanded Tests........................................................................................................................................ 2-11
2.15.2
Power On Reset Tests .................................................................................................................................. 2-11
Low Power Sleep Mode ................................................................................................................................................ 2-12
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CX06833-3x/4x SMXXD Modem Data Sheet
3. Hardware Interface ...............................................................................................................................3-1
3.1
3.2
3.3
3.4
3.5
CX06833 Hardware Pins and Signals ............................................................................................................................. 3-1
3.1.1
CX06833 Interface Signals ............................................................................................................................. 3-1
CX20442 VC Hardware Pins and Signals (S Models) ................................................................................................... 3-17
3.2.1
CX20442 VC Signal Summary...................................................................................................................... 3-17
3.2.1.1
Speakerphone Interface............................................................................................................ 3-17
3.2.1.2
Telephone Handset/Headset Interface...................................................................................... 3-17
3.2.1.3
CX06833 Modem Interface ...................................................................................................... 3-17
3.2.1.4
Host Interface........................................................................................................................... 3-17
3.2.2
CX20442 VC Pin Assignments and Signal Definitions.................................................................................. 3-18
Electrical and Environmental Specifications ................................................................................................................. 3-24
3.3.1
Operating Conditions, Absolute Maximum Ratings, and Power Requirements ........................................... 3-24
Interface and Timing Waveforms ................................................................................................................................. 3-26
3.4.1
External Memory Bus Timing ....................................................................................................................... 3-26
3.4.2
Parallel Host Bus Timing .............................................................................................................................. 3-28
3.4.3
Serial DTE Interface...................................................................................................................................... 3-30
Crystal Specifications ................................................................................................................................................... 3-31
4. Package Dimensions ............................................................................................................................4-1
5. Parallel Host Interface ..........................................................................................................................5-1
5.1
5.2
5.3
5.4
102228A
Overview ......................................................................................................................................................................... 5-1
Register Signal Definitions ............................................................................................................................................. 5-3
5.2.1
IER - Interrupt Enable Register (Addr = 1, DLAB = 0) .................................................................................... 5-3
5.2.2
FCR - FIFO Control Register (Addr = 2, Write Only) ....................................................................................... 5-4
5.2.3
IIR - Interrupt Identifier Register (Addr = 2) .................................................................................................. 5-5
5.2.4
LCR - Line Control Register (Addr = 3) .......................................................................................................... 5-6
5.2.5
MCR - Modem Control Register (Addr = 4).................................................................................................... 5-7
5.2.6
LSR - Line Status Register (Addr = 5)............................................................................................................ 5-7
5.2.7
MSR - Modem Status Register (Addr = 6) ..................................................................................................... 5-9
5.2.8
RBR - RX Buffer (Receiver Buffer Register) (Addr = 0, DLAB = 0) ................................................................ 5-9
5.2.9
THR - TX Buffer (Transmitter Holding Register) (Addr = 0, DLAB = 0).......................................................... 5-9
5.2.10
Divisor Registers (Addr = 0 and 1, DLAB = 1).............................................................................................. 5-10
5.2.11
SCR - Scratch Register (Addr = 7) ............................................................................................................... 5-10
Receiver FIFO Interrupt Operation ................................................................................................................................ 5-10
5.3.1
Receiver Data Available Interrupt ................................................................................................................. 5-10
5.3.2
Receiver Character Timeout Interrupts ........................................................................................................ 5-11
Transmitter FIFO Interrupt Operation ........................................................................................................................... 5-11
5.4.1
Transmitter Empty Interrupt......................................................................................................................... 5-11
Conexant
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CX06833-3x/4x SMXXD Modem Data Sheet
Figures
Figure 1-1. SMXXD Modem Simplified Interface Diagram ................................................................................................. 1-3
Figure 1-2. SMXXD Modem Major Interfaces..................................................................................................................... 1-3
Figure 2-1. TMIND# Test Results Pulse Cycles ................................................................................................................ 2-12
Figure 3-1. CX06833 Hardware Signals for Parallel Interface (PARIF = High).................................................................... 3-2
Figure 3-2. CX06833 144-Pin TQFP Pin Signals for Parallel Interface (PARIF = High)....................................................... 3-3
Figure 3-3. CX06833 Hardware Signals for Serial Interface (PARIF = Low) ....................................................................... 3-6
Figure 3-4. CX06833 144-Pin TQFP Pin Signals for Serial Interface (PARIF = Low) .......................................................... 3-7
Figure 3-5. CX20442 VC Hardware Interface Signals ....................................................................................................... 3-19
Figure 3-6. CX20442 VC 32-Pin TQFP Pin Signals ........................................................................................................... 3-19
Figure 3-7. Waveforms - External Memory Bus................................................................................................................ 3-27
Figure 3-8. Waveforms - Parallel Host Bus....................................................................................................................... 3-29
Figure 3-9. Waveforms - Serial DTE Interface .................................................................................................................. 3-30
Figure 4-1. Package Dimensions - 144-Pin TQFP............................................................................................................... 4-1
Figure 4-2. Package Dimensions - 32-Pin TQFP................................................................................................................. 4-2
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Conexant
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CX06833-3x/4x SMXXD Modem Data Sheet
Tables
Table 1-1. SMXXD Modem Models and Functions ............................................................................................................. 1-2
Table 1-2. Default Countries Supported.............................................................................................................................. 1-8
Table 2-1. +MS Command Automode Connectivity ............................................................................................................ 2-3
Table 3-1. CX06833 144-Pin TQFP Pin Signals for Parallel Interface (PARIF = High) ........................................................ 3-4
Table 3-2. CX06833 144-Pin TQFP Pin Signals for Serial Interface (PARIF = Low) ........................................................... 3-8
Table 3-3. CX06833 Pin Signal Definitions ....................................................................................................................... 3-10
Table 3-4. CX06833 I/O Type Definitions.......................................................................................................................... 3-16
Table 3-5. CX06833 DC Electrical Characteristics ............................................................................................................ 3-16
Table 3-6. CX20442 VC 32-Pin TQFP Pin Signals............................................................................................................. 3-20
Table 3-7. CX20442 VC Pin Signal Definitions.................................................................................................................. 3-21
Table 3-8. CX20442 VC DC Electrical Characteristics ....................................................................................................... 3-22
Table 3-9. CX20442 VC Analog Electrical Characteristics................................................................................................. 3-23
Table 3-10. Operating Conditions ..................................................................................................................................... 3-24
Table 3-11. Absolute Maximum Ratings........................................................................................................................... 3-24
Table 3-12. Current and Power Requirements.................................................................................................................. 3-25
Table 3-13. Timing - External Memory Bus ...................................................................................................................... 3-26
Table 3-14. Timing - Parallel Host Bus ............................................................................................................................. 3-28
Table 3-15. Crystal Specifications .................................................................................................................................... 3-31
Table 5-1. Parallel Interface Registers ................................................................................................................................ 5-2
Table 5-2. Interrupt Sources and Reset Control ................................................................................................................. 5-5
Table 5-3. Programmable Baud Rates .............................................................................................................................. 5-10
102228A
Conexant
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CX06833-3x/4x SMXXD Modem Data Sheet
Revision History
Incorporated in Doc. No. 102228B
Table 3-3: Delete erroneous VDD pin number, add SR1IO row, correct PA5 pin number,
and correct the RESERVED pin numbers for Serial DTE Configuration..
Incorporated in Doc. No. 102228A
Initial release.
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Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
1.
Introduction
1.1
Overview
The Conexant SMXXD Modem is a full-featured, controller-based modem that
integrates modem controller (MCU), modem data pump (MDP), 256 KB ROM, 32 KB
RAM, and analog line interface codec functions into a single package.
The modem operates by executing firmware from internal ROM and RAM. Optional
customized firmware is supported with optional external flash ROM memory.
Additionally, added/modified country profiles are supported by internal SRAM patch
(maximum of one profile) or serial EEPROM. Downloadable architecture supports
downloading of customized MCU firmware from the host/DTE to the SMXXD modem.
The SMXXD Modem device set, consisting of a CX06833 modem device in a 144-pin
TQFP and an optional CX20442 Voice Codec (VC) in a 28-pin TQFP.
Low profile TQFP packages with reduced voltage operation and low power consumption
make this modem an ideal solution for embedded applications using parallel host or serial
DTE interface.
The SMXXD Modem supports data rates up to V.92, data compression, error correction,
fax rates up to 14.4 kbps and speakerphone mode.
In V.92 and V.90 (V.92 models) data modes, the modem can receive data at speeds up to
56 kbps. In V.34 data mode (V.92 and V.34 models), the modem can receive data at
speeds up to 33.6 kbps. In V.32 bis data mode, the modem can receive data at speeds up
to 14.4 kbps.
Data compression (V.44/V.42bis/MNP5) and error correction (V.42/MNP 2-4) modes
are supported to maximize data throughput and data transfer integrity. Non-errorcorrection mode is also supported.
Fax Group 3 send and receive rates are supported up to 14.4 kbps with T.30 protocol.
The SMXXD modem operates with PSTN telephone lines worldwide.
S models, using the optional CX20442 Voice Codec (VC) in a 32-pin TQFP, support
position independent, full-duplex speakerphone (FDSP) operation using microphone and
speaker, as well as other voice/TAM applications using handset or headset.
Table 1-1 lists the available models. A simplified device interface drawing is shown in
Figure 1-1. A functional interface drawing showing optional memory is shown in
Figure 1-2.
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Conexant
1-1
CX06833-3x/4x SMXXD Modem Data Sheet
1.2
Applications
•
•
•
•
•
•
Internet appliances
Remote monitoring and data collection systems
Serial box modems
Standalone TAM/fax machines
Set top boxes
Security devices
Table 1-1. SMXXD Modem Models and Functions
Marketing Name/Order No./Part No.
Marketing
Name
Device Set Order
No.
Single Chip
Modem
[144-Pin TQFP]
Part No.
SM56D
DS56-L147-042
SM56D/S
DS56-L147-052
SM336D
DS28-L147-042
SM336D/S
SM144D
Supported Functions
Voice Codec
(VC)
[32-Pin TQFP]
Part No.
V.90 Data,
QC, MOH,
PCM
V.34 Data
V.32 bis Data,
V.44 Data
Compression,
V.17 Fax,
TAM,
Worldwide
Voice/
FDSP
Lead-free
Device
(Note 3)
CX06833-34
—
Y
Y
Y
—
N
CX06833-34
CX20442-11
Y
Y
Y
Y
N
CX06833-32
—
—
Y
Y
—
N
DS28-L147-052
CX06833-32
CX20442-11
—
Y
Y
Y
N
DS96-L147-042
CX06833-33
—
—
—
Y
—
N
SM144D/S
DS96-L147-052
CX06833-33
CX20442-11
—
—
Y
Y
N
SM56D
DS56-L147-043
CX06833-44
—
Y
Y
Y
—
Y
SM336D
DS28-L147-043
CX06833-42
—
—
Y
Y
—
Y
SM144D
DS96-L147-043
CX06833-43
—
—
—
Y
—
Y
Notes:
1. Model options:
S
56
336
144
Voice/full-duplex speakerphone (FDSP)
56 kbps max. rate per V.90
33.6 kbps max. rate per V.34
14.4 kbps max. rate per V.32 bis
2. Supported functions (Y = Supported; — = Not supported):
QC
MOH
PCM
TAM
FDSP
Quick connect
Modem-on-Hold
PCM upstream
Telephone answering machine (Voice playback and record through telephone line)
Full-duplex speakerphone and voice playback and record through telephone line, handset, and mic/speaker
3. Lead-free (PB-free) device.
1-2
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Figure 1-1. SMXXD Modem Simplified Interface Diagram
PARALLEL
HOST BUS OR
SERIAL DTE
INTERFACE
Telephone
Line
Interface
Discrete
Components
CX06833
Single Chip Modem
144-Pin TQFP
CX20442
Voice Codec
(VC)
32-Pin TQFP
(Optional)
TIP
RING
TIP
RING
TELEPHONE LINE
HANDSET (OPTIONAL)
MIC
SPEAKER
(OPTIONAL)
102228_001
Figure 1-2. SMXXD Modem Major Interfaces
DAA Hardware
CX06833
Single Chip Modem
144-Pin TQFP
Telephone
Line Interface
Discrete
Components
Line Interface
Codec
Voice Relay,
HS Pickup
(Optional)
PARALLEL
HOST BUS OR
SERIAL DTE
INTERFACE
Microcontroller
Unit (MCU)
Modem Data
Pump (MDP)
CX20442
Voice Codec (VC)
32-Pin TQFP
(Optional)
ROM
(256K x 8)
Serial EEPROM
2K (256 x 8) to
256K (32K x 8)
(Optional)
RAM
(32K x 8)
RAM
1M (128K x 8)
(Optional)
TELEPHONE
LINE
TIP
RING
TELEPHONE
HANDSET
TIP
RING
HS Hybrid
Components
(Optional)
(Mic/Speaker)
Interface
(Optional)
MIC
SPEAKER
Digital Speaker
Circuit (Optional)
SOUNDUCER
Flash ROM
2M (256K x 8)
(Optional)
102228_002
102228A
Conexant
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CX06833-3x/4x SMXXD Modem Data Sheet
1.3
Features
1.3.1
General Modem Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1-4
Data modem
− Quick connect, Modem-on-Hold, and PCM upstream functions (V.92 models)
− ITU-T V.92/V.90 (V.92 models), V.34 (V.92 and V.34 models), V.32bis, V.32,
V.29, FastPOS (V.29), V.22 bis, V.22, V.22 Fast Connect, V.23, V.21,
Bell 212A, and Bell 103
− V.250 and V.251 commands
Data compression and error correction
− V.44 data compression
− V.42 bis and MNP 5 data compression
− V.42 LAPM and MNP 2-4 error correction
Fax modem send and receive rates up to 14.4 kbps
− V.17, V.29, V.27 ter, and V.21 channel 2
− EIA/TIA 578 Class 1 and T.31 Class 1.0
V.80 synchronous access mode supports host-controlled communication protocols
with H.324 interface support
Interfaces to optional external ROM/flash ROM, RAM, and/or optional serial
EEPROM
Data/Fax/Voice call discrimination
Hardware-based modem controller
Hardware-based digital signal processor (DSP)
Support for many country-specific DAA configurations
− On-hook and/or off-hook Caller ID detection for selected countries
− Call progress, blacklisting
− Internal ROM includes default values for 29 countries
− Additional and modified country profile can be stored in internal SRAM
Caller waiting detection
Caller ID detect
− On-hook Caller ID detection
− Off-hook Call Waiting Caller ID detection during data mode in V.92, V.90,
V.34, V.32bis, and V.32
Distinctive ring detect
Modem customization available through patch code that can be stored in optional
serial EEPROM or internal SRAM
Telephony/TAM
− V.253 commands
− 2-bit and 4-bit Conexant ADPCM, 8-bit linear PCM, and 4-bit IMA coding
− 8 kHz sample rate
− Concurrent DTMF, ring, and Caller ID detection
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
•
•
•
•
•
•
•
•
•
•
Full-duplex speakerphone (FDSP) mode using optional CX20442 Voice Codec
(S models)
− Microphone and speaker interface
− Telephone handset or headset interface
− Acoustic and line echo cancellation
− Microphone gain and muting
− Speaker volume control and muting
Built-in host/DTE interface
− Parallel 16550A UART-compatible interface up to 230.4 kbps
− Serial ITU-T V.24 (EIA/TIA-232-E) logical interface up to 115.2 kbps
Downloadable architecture
Direct mode (serial DTE interface)
Flow control and speed buffering
Automatic format/speed sensing
Serial async/sync data; parallel async data
Thin packages support low profile designs (1.6 mm max. height)
− CX06833 Modem device in 144-pin TQFP
− CX20442 VC in 32-pin TQFP
+3.3V operation with +5V tolerant digital inputs
Typical power use
− CX06833: 191 mW (Normal Mode); 53 mW (Sleep Mode)
− CX20442: 5 mW (Normal Mode)
1.4
Technical Overview
1.4.1
General Description
Modem operation, including dialing, call progress, telephone line interface, telephone
handset interface, optional voice/speakerphone interface, and host interface functions are
supported and controlled through the V.250, V.251, and V.253-compatible command set.
The modem hardware connects to the host via a parallel or serial interface as selected by
the PARIF input. The OEM adds a crystal circuit, telephone line interface, telephone
handset/telephony extension interface, voice/speakerphone interface, optional external
serial EEPROM, optional external ROM/flash ROM, optional external RAM, and other
supporting discrete components as supported by the modem model (Table 1-1) and
required by the application to complete the system.
Customized modem firmware can be supported by the use of external memory in various
combinations, e.g., either external ROM/flash ROM (up to 256 KB), or external serial
EEPROM (256 to 32 KB) and external RAM (up to 128 KB). To support country profile
addition or modification, external serial EEPROM (256 to 32 KB) can be installed.
Customized code can include OEM-defined commands, i.e., identification codes (I3),
identifier string (I4), manufacturer identification (+GMI), model identification (+GMM),
and revision identification (+GMR), as well as code modification.
Parallel interface operation is selected by PARIF input high.
Serial interface operation is selected by PARIF input low.
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CX06833-3x/4x SMXXD Modem Data Sheet
1.4.2
MCU Firmware
MCU firmware performs processing of general modem control, command sets, data
modem, error correction and data compression (ECC), fax class 1, fax class 1.0,
voice/audio/TAM/speakerphone, worldwide, V.80, and serial DTE/parallel host interface
functions according to modem models (Table 1-1).
MCU firmware can be customized to include OEM-defined commands, i.e.,
identification codes (I3), identifier string (I4), manufacturer identification (+GMI), model
identification (+GMM), and revision identification (+GMR), as well as code
modification.
The modem firmware is provided in object code form for the OEM to program into
external ROM/flash ROM. The modem firmware may also be provided in source code
form under a source code addendum license agreement. External ROM/Flash ROM and
RAM must be installed in order to operate the modem with customized firmware.
1.4.3
1.4.3.1
Operating Modes
Data/Fax Modes
Data modem modes perform complete handshake and data rate negotiations. Using
modem modulations to optimize modem configuration for line conditions, the modem
can connect at the highest data rate that the channel can support from 56 kbps down to
2400 bps with automatic fallback.
In V.92/V.90 data modem modes (V.92 models), the modem can receive data from a
digital source using a V.92-compatible central site modem at line speeds up to 56 kbps.
With PCM upstream enabled (V.92 only), data transmission supports sending data at line
speeds up to 48 kbps. When PCM upstream is disabled, data transmission supports
sending data at line speeds up to V.34 rates. This mode can fallback to V.34 mode and to
lower rates as dictated by line conditions.
The following modes are supported in V.92 models when connected to a V.92compatible server supporting the feature listed.
•
Quick connect: Allows quicker subsequent connections to a server by using stored
line parameters obtained during the initial connection.
•
Modem-on-Hold: Allows detection and reporting of incoming phone calls on the
PSTN with enabled Call Waiting. If the incoming call is accepted by the user, the
user has a pre-defined amount of time of holding the data connection for a brief
conversation. The data connection resumes upon incoming call termination.
•
PCM upstream: Boosts the upstream data rates. A maximum of 48 kbps is supported
when connected to a V.92 server that supports PCM upstream.
In V.34 data modem mode (V.92 and V.34 models), the modem can operate in fullduplex, asynchronous modes at line rates up to 33.6 kbps. Automode operation in V.34 is
provided in accordance with PN3320 and in V.32 bis in accordance with PN2330. All
tone and pattern detection functions required by the applicable ITU or Bell standards are
supported.
In V.32 bis data modem mode, the modem can operate at line speeds up to 14.4 kbps.
In fax modem mode, the modem can operate in half-duplex, synchronous modes and can
support Group 3 facsimile send and receive speeds of 14400, 12000, 9600, 7200, 4800,
and 2400 bps. Fax data transmission and reception performed by the modem are
controlled and monitored through the EIA/TIA-578 Fax Class 1, or T.31 Fax Class 1.0
1-6
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
command interface. Full HDLC formatting, zero insertion/deletion, and CRC
generation/checking are provided.
1.4.3.2
V.44 Data Compression
V.44 provides efficient data compression that minimizes the download time for the types
of files associated with Internet use. This improvement is most noticeable when browsing
and searching the web since HTML text files are highly compressible. (The improved
performance amount varies both with the actual format and with the content of individual
pages and files.)
1.4.3.3
Country Support
Country-specific modem parameters for functions such as dialing, carrier transmit level,
calling tone, call progress tone detection, answer tone detection, blacklisting, caller ID,
and relay control are programmable.
Country code IDs are defined by ITU-T T.35.
Embedded ROM code includes default profiles for 29 countries. Additional country
profiles can be stored in internal SRAM or external serial EEPROM (request additional
country profiles from a Conexant Sales Office). Duplicate country profiles stored in
internal SRAM or external serial EEPROM will override the profiles in embedded ROM
code. The default countries supported are listed Table 1-2. Country profiles for CTR-21
countries are TBR-21 compliant.
1.4.3.4
TAM Mode
TAM Mode features include 8-bit linear coding at 8 kHz sample rate. Tone detection/
generation, call discrimination, and concurrent DTMF detection are also supported.
TAM Mode is supported by four submodes:
•
•
•
•
102228A
Online Voice Command Mode supports connection to the telephone line or, for S
models, a microphone/speaker/handset/headset.
Voice Receive Mode supports recording voice or audio data input from the
telephone line or, for S models, a microphone/handset/headset.
Voice Transmit Mode supports playback of voice or audio data to the telephone line
or, for S models, a speaker/handset/headset.
Full-duplex Receive and Transmit Mode.
Conexant
1-7
CX06833-3x/4x SMXXD Modem Data Sheet
Table 1-2. Default Countries Supported
1.4.3.5
Country
Country
Code
Call Waiting Tone
Detection (CW)
Supported
On-Hook Type 1
Caller ID (CID)
Supported
Australia
Austria
Belgium
Brazil
China
Denmark
Finland
France
Germany
Hong Kong
India
Ireland
Italy
Japan
Korea
Malaysia
Mexico
Netherlands
Norway
Poland
Portugal
Singapore
South Africa
Spain
Sweden
Switzerland
Taiwan
United Kingdom
United States
Reserved
09
0A
0F
16
26
31
3C
3D
42
50
53
57
59
00
61
6C
73
7B
82
8A
8B
9C
9F
A0
A5
A6
FE
B4
B5
FD
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Off-Hook Type 2
Called ID (CID2)
Supported
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Speakerphone Mode (S Models)
S models include additional telephone handset, external microphone, and external
speaker interfaces which support voice and full-duplex speakerphone (FDSP) operation.
Hands-free full-duplex telephone operation is supported in Speakerphone Mode under
host control. Speakerphone Mode features an advanced proprietary speakerphone
algorithm which supports full-duplex voice conversation with acoustic, line, and handset
echo cancellation. Parameters are constantly adjusted to maintain stability with automatic
fallback from full-duplex to pseudo-duplex operation. The speakerphone algorithm
allows position independent placement of microphone and speaker. The host can
separately control volume, muting, and AGC in microphone and speaker channels.
1-8
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
1.4.4
Reference Designs
Data/fax/TAM/speakerphone reference designs for external modems are available to
minimize application design time, reduce development cost, and accelerate market entry.
These designs are:
•
For CX06833: RD01-D460-1xx
A design package is available in electronic form. This package includes schematics, bill
of materials (BOM), vendor part list (VPL), board layout files in Gerber format, and
complete documentation.
1.5
Hardware Description
1.5.1
CX06833 Modem Device
The CX06833 Modem, packaged in a 144-pin TQFP, includes a Microcontroller (MCU),
a Modem Data Pump (MDP), 256 KB internal ROM, and 32 KB internal RAM interface
functions.
The CX06833 Modem connects to host via a parallel host (PARIF = high) or a logical
V.24 (EIA/TIA-232-E) serial DTE interface (PARIF = low).
The CX06833 Modem performs the command processing and host interface functions.
The crystal frequency is 28.224 MHz ± 50 ppm.
The CX06833 Modem optionally connects to an external OEM-supplied serial EEPROM
over a dedicated 2-line serial interface. The capacity of the EEPROM can be 256 bytes
up to 32 KB. The EEPROM can hold information such as firmware configuration
customization, and country code parameters.
The CX06833 Modem performs telephone line signal modulation/demodulation in a
hardware digital signal processor (DSP) which reduces computational load on the host
processor.
The CX06833 optionally connects to external OEM-supplied ROM/flash ROM and
RAM over a non-multiplexed 19-bit address bus and 8-bit data bus.
1.5.2
CX20442 Voice Codec
The optional CX20442 Voice Codec (VC), packaged in a 32-pin TQFP, supports
voice/full-duplex speakerphone (FDSP) operation with interfaces to a microphone and
speaker and to a telephone handset/headset.
102228A
Conexant
1-9
CX06833-3x/4x SMXXD Modem Data Sheet
1.6
AT Commands
The SMXXD Modem supports AT commands for data mode, fax class 1 or 1.0,
voice/audio, full-duplex speakerphone (FDSP), V.80 commands, and S Register. See
Doc. No. 102184 for a description of the commands.
Data Mode Operation. Data functions operate in response to the AT commands when
+FCLASS=0. Default parameters support U.S./Canada operation.
Fax Mode Operation. Facsimile functions operate in response to fax class 1 commands
when +FCLASS=1 or to fax class 1.0 commands when +FCLASS=1.0.
Voice/Audio Operation. Voice/audio functions operate in response to voice/audio
commands when +FCLASS=8.
Speakerphone Operation. FDSP functions operate in response to speakerphone
commands when +FCLASS=8 and +VSP=1 is selected.
1-10
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
2.
Technical Specifications
2.1
Serial DTE Interface Operation
2.1.1
Automatic Speed/Format Sensing
Command Mode and Data Mode. The modem can automatically determine the speed
and format of the data sent from the DTE. The modem can sense speeds of 300, 600,
1200, 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400,
28800, 38400, 57600, and 115200 bps and the following data formats:
Data Length
No. of
Character Length
Parity
(No. of Bits)
Stop Bits
(No. of Bits)
None
7
2
10
Odd
7
1
10
Even
7
1
10
None
8
1
10
Odd
8
1
11*
Even
8
1
11*
*11-bit characters are sensed, but the parity bit is stripped off during
data transmission in Normal and Error Correction modes.
The modem can speed sense data with mark or space parity and configures itself as
follows:
DTE Configuration
7 mark
7 space
8 mark
8 space
Modem Configuration
7 none
8 none
8 none
8 even
Fax Mode. In V.17 fax mode, the modem can sense speeds up to 115.2 kbps.
102228A
Conexant
2-1
CX06833-3x/4x SMXXD Modem Data Sheet
2.2
Parallel Host Bus Interface Operation
Command Mode and Data Mode. The modem can operate at rates up to 230.4 kbps by
programming the Divisor Latch in the parallel interface registers if supported by
communications software and/or driver.
Fax Mode. In V.17 mode, the modem can operate at rates up to 230.4 kbps by
programming the Divisor Latch in the parallel interface registers if supported by
communications software and/or driver.
2.3
Establishing Data Modem Connections
2.3.1
Dialing
DTMF Dialing. DTMF dialing using DTMF tone pairs is supported in accordance with
ITU-T Q.23. The transmit tone level complies with Bell Publication 47001.
Pulse Dialing. Pulse dialing is supported in accordance with EIA/TIA-496-A.
Blind Dialing. The modem can blind dial in the absence of a dial tone if enabled by the
X0, X1, or X3 command.
2.3.2
Telephone Number Directory
The modem supports four telephone number entries in a directory that can be saved in a
serial EEPROM. Each telephone number can be up to 32 characters (including the
command line terminating carriage return) in length. A telephone number can be saved
using the &Zn=x command, and a saved telephone number can be dialed using the DS=n
command.
2.3.3
Modem Handshaking Protocol
If a tone is not detected within the time specified in the S7 register after the last digit is
dialed, the modem aborts the call attempt.
2.3.4
Call Progress Tone Detection
Ringback, equipment busy, congested tone, warble tone, and progress tones can be
detected in accordance with the applicable standard.
2.3.5
Answer Tone Detection
Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T modes
and 2225 ± 40 Hz in Bell modes.
2.3.6
Ring Detection
A ring signal can be detected from a TTL-compatible 15.3 Hz to 68 Hz square wave
input.
2-2
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
2.3.7
Billing Protection
When the modem goes off-hook to answer an incoming call, both transmission and
reception of data are prevented for 2 seconds (data modem) or 4 seconds (fax adaptive
answer) to allow transmission of the billing tone signal.
2.3.8
Connection Speeds
The modem functions as a data modem when the +FCLASS=0 command is active.
Line connection can be selected using the +MS command. The +MS command selects
modulation, enables/disables automode, and selects minimum and maximum line speeds
(Table 2-1).
2.3.9
Automode
Automode detection can be enabled by the +MS command to allow the modem to
connect to a remote modem in accordance with draft PN-3320 for V.34 (Table 2-1).
Table 2-1. +MS Command Automode Connectivity
Modulation
102228A
<carrier>
Bell 103
Bell 212
V.21
V.22
V.22 bis
V.23
V.32
V.32 bis
V.34
B103
B212
V21
V22
V22B
V23C
V32
V32B
V34
V.90
V90
V.92 downstream
V92
V.92 upstream
V92
Possible (<min_rx_rate>, <min_rx_rate>, (<min_tx_rate>),
and <max_tx_rate>) Rates (bps)
300
1200 Rx/75 Tx or 75 Rx/1200 Tx
300
1200
2400 or 1200
1200
9600 or 4800
14400, 12000, 9600, 7200, or 4800
33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,
37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000,
26667, 25333, 24000
Conexant
2-3
CX06833-3x/4x SMXXD Modem Data Sheet
2.4
Data Mode
The modem enters data mode when a telephone line connection has been established
between modems and all handshaking has been completed.
2.4.1
Speed Buffering (Normal Mode)
Speed buffering allows a DTE to send data to, and receive data from, a modem at a speed
different than the line speed. The modem supports speed buffering at all line speeds.
2.4.2
Flow Control
DTE-to-Modem Flow Control. If the modem-to-line speed is less than the DTE-tomodem speed, the modem supports XOFF/XON or RTS/CTS flow control with the DTE
to ensure data integrity.
2.4.3
Escape Sequence Detection
The +++ escape sequence can be used to return control to the command mode from the
data mode. Escape sequence detection is disabled by an S2 Register value greater than
127.
2.4.4
BREAK Detection
The modem can detect a BREAK signal from either the DTE or the remote modem. The
\Kn command determines the modem response to a received BREAK signal.
2.4.5
Telephone Line Monitoring
GSTN Cleardown (V.90, V.34, V.32 bis, V.32). Upon receiving GSTN Cleardown
from the remote modem in a non-error correcting mode, the modem cleanly terminates
the call.
Loss of Carrier (V.22 bis and Below). If carrier is lost for a time greater than specified
by the S10 register, the modem disconnects.
2.4.6
Fall Forward/Fallback (V.92/V.90/V.34/V.32 bis/V.32)
During initial handshake, the modem will fallback to the optimal line connection within
V.92/V.90/V.34/V.32 bis/V.32 mode depending upon signal quality if automode is
enabled by the +MS or N1 command.
When connected in V.92/V.90/V.34/V.32 bis/V.32 mode, the modem will fall forward or
fallback to the optimal line speed within the current modulation depending upon signal
quality if fall forward/fallback is enabled by the %E2 command.
2-4
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
2.4.7
Retrain
The modem may lose synchronization with the received line signal under poor or
changing line conditions. If this occurs, retraining may be initiated to attempt recovery
depending on the type of connection.
The modem initiates a retrain if line quality becomes unacceptable if enabled by the %E
command. The modem continues to retrain until an acceptable connection is achieved, or
until 30 seconds elapse resulting in line disconnect.
2.4.8
Programmable Inactivity Timer
The modem disconnects from the line if data is not sent or received for a specified length
of time. In normal or error-correction mode, this inactivity timer is reset when data is
received from either the DTE or from the line. This timer can be set to a value between 0
and 255 seconds by using register S30. A value of 0 disables the inactivity timer.
2.4.9
DTE Signal Monitoring (Serial DTE Interface Only)
DTR#. When DTR# is asserted, the modem responds in accordance with the &Dn and
&Qn commands.
RTS#. RTS# is used for flow control if enabled by the &K command in normal or errorcorrection mode.
2.5
V.92 Features
Modem-on-Hold, quick connect, and PCM upstream are only available in V.92 models
when connecting in V.92 data mode. V.92 features are only available when the server
called is a V.92 server that supports that particular feature.
2.5.1
Modem-on-Hold
The Modem-on-Hold (MOH) function enables the modem to place a data call to the
Internet on hold while using the same line to accept an incoming or place an outgoing
voice call. This feature is available only with a connection to a server supporting MOH.
MOH can be executed through either of two methods:
•
•
102228A
One method is to enable MOH through the +PMH command. With Call Waiting
Detection (+PCW command) enabled, an incoming call can be detected while online. Using a string of commands, the modem negotiates with the server to place the
data connection on hold while the line is released so that it can be used to conduct a
voice call. Once the voice call is completed, the modem can quickly renegotiate with
the server back to the original data call.
An alternative method is to use communications software that utilizes the Conexant
Modem-on-Hold drivers under Windows PC operating systems. Using this method,
the software can detect an incoming call, place the data connection on hold, and
switch back to a data connection.
Conexant
2-5
CX06833-3x/4x SMXXD Modem Data Sheet
2.5.2
Quick Connect
The quick connect function enables the modem to shorten the connect time of subsequent
calls to a server supporting quick connect. The quick connect feature is supported by the
+PQC command.
2.5.3
PCM Upstream
PCM upstream boosts the upstream data rates between the user and ISP to reduce upload
times for large files and email attachments. A maximum of 48 kbps upstream rate is
supported with PCM upstream enabled, in contrast to a maximum of 32.2 kbps upstream
rate with PCM upstream not enabled. PCM upstream is supported by the +PCM
command. PCM upstream is disabled by default.
2.6
Error Correction and Data Compression
2.6.1
V.42 Error Correction
V.42 supports two methods of error correction: LAPM and, as a fallback, MNP 4. The
modem provides a detection and negotiation technique for determining and establishing
the best method of error correction between two modems.
2.6.2
MNP 2-4 Error Correction
MNP 2-4 is a data link protocol that uses error correction algorithms to ensure data
integrity. Supporting stream mode, the modem sends data frames in varying lengths
depending on the amount of time between characters coming from the DTE.
2.6.3
V.44 Data Compression
V.44 data compression mode, enabled by the +DS44 command, encodes pages and files
associated with Web pages. These files include WEB pages, graphics and image files,
and document files. V.44 can provide an effective data throughput rate up to DTE rate
for a 56-kbps connection. The improved performance amount varies both with the actual
format and with the content of individual pages and files.
2.6.4
V.42 bis Data Compression
V.42 bis data compression mode, enabled by the %Cn command or S46 register, operates
when a LAPM connection is established.
The V.42 bis data compression employs a “string learning” algorithm in which a string of
characters from the DTE is encoded as a fixed length codeword. Two 2-KB dictionaries
are used to store the strings. These dictionaries are dynamically updated during normal
operation.
2-6
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
2.6.5
MNP 5 Data Compression
MNP 5 data compression mode, enabled by the %Cn command, operates during an MNP
connection.
In MNP 5, the modem increases its throughput by compressing data into tokens before
transmitting it to the remote modem, and by decompressing encoded received data before
sending it to the DTE.
2.7
Telephony Extensions
The following telephony extension features are supported and are typically implemented
in designs for set-top box applications and TAM software applications to enhance enduser experience:
•
Line In Use detection
•
Extension Pickup detection
•
Remote Hang-up detection
The telephony extension features are enabled through the -STE command. The -TTE
command can be used to adjust the voltage thresholds for the telephony extension
features.
2.7.1
Line In Use Detection
The Line In Use Detection feature can stop the modem from disturbing the phone line
when the line is already being used. When an automated system tries to dial using ATDT
and the phone line is in use, the modem will not go off hook and will respond with the
message “LINE IN USE”. In the case where no phone line is connected to the modem,
the modem will respond with the message “NO LINE”.
2.7.2
Extension Pickup Detection
The Extension Pickup Detection feature (also commonly referred as PPD or Parallel
phone detection) allows the modem to detect when another telephony device (i.e., fax
machine, phone, satellite/cable box) is attempting to use the phone line. When an
extension pickup has been detected, the modem will go on-hook and respond with the
message “OFF-HOOK INTRUSION”.
The Remote Hangup Detection feature will cause the modem to go back on-hook and
respond with the message “LINE REVERSAL DETECTED” during a data connection
when the remote modem is disconnected for abnormal termination reasons (remote phone
line unplugged, remote server/modem shutdown). For Voice applications, this method
can be used in addition to silence detection to determine when a remote caller has hung
up to terminate a voice recording.
This feature can be used to quickly drop a modem connection in the event when a user
picks up a extension phone line. For example, this feature allows set top boxes with an
integrated SMXXD modem to give normal voice users the highest priority over the
telephone line.
This feature can also be used in Telephone Answering Machine applications (TAM). Its
main use would be to stop the TAM operation when a phone is picked up.
102228A
Conexant
2-7
CX06833-3x/4x SMXXD Modem Data Sheet
2.7.3
Remote Hangup Detection
The Remote Hangup Detection feature will cause the modem to go back on-hook and
respond with the message “LINE REVERSAL DETECTED” during a data connection
when the remote modem is disconnected for abnormal termination reasons (remote phone
line unplugged, remote server/modem shutdown). For Voice applications, this method
can be used in addition to silence detection to determine when a remote caller has hung
up to terminate a voice recording.
2.8
Fax Class 1 and Fax Class 1.0 Operation
Facsimile functions operate in response to fax class 1 commands when +FCLASS=1 or
to fax class 1.0 commands when +FCLASS=1.0.
In the fax mode, the on-line behavior of the modem is different from the data (non-fax)
mode. After dialing, modem operation is controlled by fax commands. Some AT
commands are still valid but may operate differently than in data modem mode.
Calling tone is generated in accordance with T.30.
2.9
Point-of-Sales Support
Point-of-Sales (POS) terminals usually need to exchange a small amount of data in the
shortest amount of time. Low speed modulations such as Bell212A or V.22 are still
mainly used in POS applications. Additionally, new non-standard sequences have been
developed to better support POS applications.
Industry standard and shortened answer tone B103 and V.21 are supported, as well as
FastPOS (V.29) and V.22 Fast Connect. POS terminal modulations are supported by the
$F command.
2.10
Voice/Audio Mode
Voice and audio functions are supported by the Voice Mode. Voice Mode includes four
submodes: Online Voice Command Mode, Voice Receive Mode, Voice Transmit Mode
and Full-Duplex Receive and Transmit Mode.
2.10.1
Online Voice Command Mode
This mode results from the connection to the telephone line or a voice/audio I/O device
(e.g., microphone, speaker, or handset) through the use of the +FCLASS=8 and +VLS
commands. After mode entry, AT commands can be entered without aborting the
connection.
2.10.2
Voice Receive Mode
This mode is entered when the +VRX command is active in order to record voice or
audio data input at the RIN pin, typically from a microphone/handset or the telephone
line.
2-8
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Received analog voice samples are converted to digital form and compressed for reading
by the host. AT commands control the codec bits-per-sample rate.
Received analog mono audio samples are converted to digital form and formatted into 8bit unsigned linear PCM format for reading by the host. AT commands control the bit
length and sampling rate. Concurrent DTMF/tone detection is available at the 8 kHz
sample rate.
2.10.3
Voice Transmit Mode
This mode is entered when the +VTX command is active in order to playback voice or
audio data to the TXA output, typically to a speaker/handset or to the telephone line.
Digitized voice data is decompressed and converted to analog form at the original
compression quantization sample-per-bits rate then output to the TXA output.
Digitized audio data is converted to analog form then output to the TXA output.
2.10.4
Full-Duplex Receive and Transmit Mode
This mode is entered when the +VTR command is active in order to concurrently receive
and transmit voice.
2.10.5
Audio Mode
The audio mode enables the host to transmit and receive 8-bit audio signals. In this
mode, the modem directly accesses the internal analog-to-digital (A/D) converter (ADC)
and the digital-to-analog (D/A) converter (DAC). Incoming analog audio signals can
then be converted to digital format and digital signals can be converted to analog audio
output.
2.10.6
Tone Detectors
The tone detector signal path is separate from the main received signal path thus enabling
tone detection to be independent of the configuration status. In Tone Mode, all three tone
detectors are operational.
2.10.7
Speakerphone Mode
Speakerphone mode is controlled in voice mode with the following commands:
Use Speakerphone After Dialing or Answering (+VSP=1). +VSP=1 selects
speakerphone mode while in +FCLASS=8 mode. Speakerphone operation is entered
during Voice Online Command mode after completing dialing or answering.
Speakerphone Settings. The +VGM and +VGS commands can be used to control the
microphone gain and speaker volume, respectively. VGM and +VGS commands are
valid only after the modem has entered the Voice Online mode while in the +VSP=1
setting.
2.11
V.80 Synchronous Access Mode (SAM) - Video Conferencing
V.80 Synchronous Access Mode between the modem and the host/DTE is provided for
host-controlled communication protocols, e.g., H.324 video conferencing applications.
102228A
Conexant
2-9
CX06833-3x/4x SMXXD Modem Data Sheet
Voice-call-first (VCF) before switching to a videophone call is also supported.
2.12
Full-Duplex Speakerphone (FDSP) Mode (S Models)
The modem operates in FDSP mode when +FCLASS=8 and +VSP=1 (Section 2.10.7).
In FDSP Mode, speech from a microphone or handset is converted to digital form,
shaped, and output to the telephone line through the line interface circuit. Speech
received from the telephone line is shaped, converted to analog form, and output to the
speaker or handset. Shaping includes both acoustic and line echo cancellation.
2.13
Caller ID
Both Type I Caller ID (On-Hook Caller ID) and Type II Caller ID (Call Waiting Caller
ID) are supported for U.S. and many other countries (see Section 2.14). Both types of
Caller ID are enabled/disabled using the +VCID command. Call Waiting Tone detection
must be enabled using the +PCW command to detect and decode Call Waiting Caller ID.
When enabled, caller ID information (date, time, caller code, and name) can be passed to
the DTE in formatted or unformatted form. Inquiry support allows the current caller ID
mode and mode capabilities of the modem to be retrieved from the modem.
Type II Caller ID (Call Waiting Caller ID) detection operates only during data mode in
V.92, V.90, V.34, V.32bis, or V.32.
2.14
Worldwide Country Support
Internal modem firmware supports 29 country profiles (see Section 1.3.2). These country
profiles include the following country-dependent parameters:
•
•
•
•
•
•
•
•
•
•
2-10
Dial tone detection levels and frequency ranges.
DTMF dialing parameters: Transmit output level, DTMF signal duration, and DTMF
interdigit interval.
Pulse dialing parameters: Make/break times, set/clear times, and dial codes are
programmable
Ring detection frequency range.
Type I and Type II Caller ID detection are supported for many countries. Contact
your local Conexant sales office for additional country support.
Blind dialing enabled/disable.
Carrier transmit level (through S91 for data and S92 for fax). The maximum,
minimum, and default values can be defined to match specific country and DAA
requirements.
Calling tone is generated in accordance with V.25. Calling tone may be toggled
(enabled/disabled) by inclusion of a “^” character in a dial string. It may also be
disabled.
Frequency and cadence of tones for busy, ringback, congested, warble, dial tone 1,
and dial tone 2.
Answer tone detection period.
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
•
Blacklist parameters. The modem can operate in accordance with requirements of
individual countries to prevent misuse of the network by limiting repeated calls to
the same number when previous call attempts have failed. Call failure can be
detected for reasons such as no dial tone, number busy, no answer, no ringback
detected, voice (rather than modem) detected, and key abort (dial attempt aborted by
user). Actions resulting from such failures can include specification of minimum
inter-call delay, extended delay between calls, and maximum numbers of retries
before the number is permanently forbidden ("blacklisted").
These country profiles may be altered or customized by modifying the country-dependent
parameters. Additional profiles may also be included. There are two ways to add or
modify profiles:
•
•
Incorporating additional or modified profiles into external flash ROM containing the
entire modem firmware code.
Linking additional or modified profiles from an external serial EEPROM (needed
only if the external flash ROM capacity is exceeded.
Please contact an FAE at the local Conexant sales office if a country code customization
is required.
2.15
Diagnostics
2.15.1
Commanded Tests
Diagnostics are performed in response to test commands.
Analog Loopback (&T1 Command). Data from the local DTE is sent to the modem,
which loops the data back to the local DTE.
DMTF Generation (%TT0 Command). Continuous DTMF tones are generated by the
DSP and output through the DAA.
Tone Generation (%TT3 Command). Continuous tones are generated by the DSP and
output through the DAA.
2.15.2
Power On Reset Tests
Upon power on, the modem performs tests of the modem and internal RAM. If the
modem or internal RAM test fails, the TMIND# output is pulsed as follows (Figure 2-1):
•
•
102228A
Internal RAM test fails: One pulse cycle (pulse cycle = 0.5 sec. on, 0.5 sec. off)
every 1.5 seconds.
Modem device test fails: Three pulse cycles every 1.5 seconds.
Conexant
2-11
CX06833-3x/4x SMXXD Modem Data Sheet
Figure 2-1. TMIND# Test Results Pulse Cycles
Internal RAM Fails
Pulse Cycle
0
.5
1.5 Sec
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
4.5
5
5.5
Modem Device Fails
Pulse Cycle
0
.5
1
1.5
1.5 Sec
2
2.5
3
3.5
4
6
6.5
7
102179_004
2.16
Low Power Sleep Mode
Sleep Mode Entry. The modem enters the low power sleep mode when no line
connection exists and no host activity occurs for the period of time specified in the S24
register. All modem circuits are turned off except the internal clock circuitry in order to
consume reduced power while being able to immediately wake up and resume normal
operation.
Wake-up. Wake-up occurs when a ring is detected on the telephone line, the host writes
to the modem (parallel interface), or the DTE sends a character to the modem (serial
interface).
2-12
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
3.
Hardware Interface
3.1
CX06833 Hardware Pins and Signals
3.1.1
CX06833 Interface Signals
CX06833 hardware interface signals for parallel interface are shown by major interface
in Figure 3-1, are shown by pin number in Figure 3-2, and are listed by pin number in
Table 3-1.
CX06833 hardware interface signals for serial interface are shown by major interface in
Figure 3-3, are shown by pin number in Figure 3-4, and are listed by pin number in
Table 3-2.
The CX06833 hardware interface signals are defined in Table 3-3.
CX06833 I/O types are defined in Table 3-4.
CX06833 DC electrical characteristics are listed in Table 3-5.
102228A
Conexant
3-1
CX06833-3x/4x SMXXD Modem Data Sheet
Figure 3-1. CX06833 Hardware Signals for Parallel Interface (PARIF = High)
116
117
CRYSTAL
CIRCUIT
115
67
NC
NC
114
NC
119
+3.3V
16
54
NC
21
23
22
112
17
18
19
123
124
126
127
128
130
132
133
PARALLEL HOST
INTERFACE
41
142
240K
+3.3V
47K
+3.3V
47K
+3.3V
63
20
30
55
65
122
113
NC
61
34
36
37
38
104
110
53
31
NC
58
60
57
35
39
NC
(PARALLEL HOST
INTERFACE ONLY)
66
+3.3V OR +5V
29
59
91
0.1
0.1
+3.3V
+3.3V A (FILTERED)
0.1
NVMCLK (PA7)
NVMDATA (PE3)
XTLI
XTLO
CLKIN
CLKOUT
DV1TP
NMIP
PARIF (MK0)
NOXYCK
HCS# (PD4)
HRD# (PD6)
HWT# (PD5)
HINT (PB7)
HA0 (PD0)
HA1 (PD1)
HA2 (PD2)
HD0 (PC0)
HD1 (PC1)
HD2 (PC2)
HD3 (PC3)
HD4 (PC4)
HD5 (PC5)
HD6 (PC6)
HD7 (PC7)
135
46
71
106
129
11
9
15
134
OH# (PE0)
VOICE# (PE1)
MUTE# (PE2)
LCS (PE4)
EXTOH# (PE7)
RING (PA0)
LINE_OUT_P
LINE_OUT_M
MIC_IN
24
25
26
28
32
33
137
138
141
ASPKR
136
LINE_IN
MIC_BIAS
M_RELAY_A
M_ACT_90
DLPBK_BAR
143
144
8
12
13
VREF
139
XXCLK
BD2CLK
PHS2
TESTP
P_PA00
PA1
PA3
PA4
PA5
PB1
PB6
PD7
PE6
P_GP01
P_PA03
P_PA07
PA2
PA6
OH#
VOICE#
MUTE#
LCS
EXTOH#
RING
TXAP
TXAM
RXA
DAA
NC
10
140
0.1
10
LPO
PE5
EEPROM (OPTIONAL)
AGND
VC
RES1#
RES2#
PD3
SCL
SDA
SPEAKER CIRCUIT
0.1
AGND
SLEEP_IN
MCLKIN
CNTLSIN
RXOUT
TXSIN
CX06833
SINGLE CHIP
MODEM
144-PIN TQFP
14
3
2
6
4
STROBE
7
SCLK
5
IA1CLK (P_PX03)
SA1CLK (P_PX02)
SR4OUT (P_PX00)
SR4IN
SR1IO (P_PX07)
51
50
49
52
62
IASLEEP (P_PF05)
56
MCLKOUT (P_PB00)
SR2CLK (P_PGP05)
SA2CLK (P_PX05)
SR3OUT
SR3IN (P_PX01)
SR2IO (P_PX06)
44
97
45
42
43
47
PLLVDD
88
PARALLEL
INTERFACE
(PARIF = HIGH)
33
33
SLEEP
33
M_CLKIN
M_SCK
M_STROBE
M_TXSIN
M_RXOUT
M_CNTRLSIN
CX20437
VOICE CODEC
(VC)
(OPTIONAL)
+3.3V
VGG
0.1uF
VDDCORE
VDDCORE
VDDCORE
PLLGND
10
48
64
84
103
111
125
131
118
1
10
40
27
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
DVDD
DVDD
AVDD
VSS
VSS
VSS
VSS
DVSS
AGND
AGND
AGND
89
A00
A01
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
A16 (PB0)
A17 (PB4)
A18 (PB5)
D0
D1
D2
D3
D4
D5
D6
D7
RD#
WT#
RAMSEL# (PB3)
ROMSEL# (PB2)
77
78
79
80
81
82
83
85
86
87
90
92
93
94
95
96
102
108
109
68
69
70
72
73
74
75
76
121
120
107
105
RESERVED
RESERVED
RESERVED
RESERVED
98
99
100
101
EXTERNAL
RAM AND ROM
NC
102228_003
3-2
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
PB6
A18 (PB5)
TESTP
HINT (PB7)
VDD
111
110
109
114
113
112
XTLI
CLKIN
DV1TP
116
115
NMIP
VDD
XTLO
117
120
119
118
PHS2
122
121
RD#
WT#
VDD
HD1 (PC1)
HD0 (PC0)
125
124
123
HD3 (PC3)
HD2 (PC2)
127
126
128
HD5 (PC5)
VSS
HD4 (PC4)
130
129
131
HD7 (PC7)
HD6 (PC6)
VDD
134
133
132
ASPKR
136
135
AVDD
AGND
VREF
LINE_OUT_M
LINE_OUT_P
139
138
137
MIC_IN
VC
142
141
140
MIC_BIAS
144
143
LINE_IN
RES2#
Figure 3-2. CX06833 144-Pin TQFP Pin Signals for Parallel Interface (PARIF = High)
DVDD
1
108
CNTLSIN
2
107
A17 (PB4)
RAMSEL# (PB3)
MCLKIN
3
106
VSS
TXSIN
4
105
ROMSEL# (PB2)
SCLK
5
104
PB1
RXOUT
6
103
VDD
STROBE
7
102
A16 (PB0)
M_RELAY_A
AGND
8
101
100
RESERVED
RESERVED
DVDD
9
10
DVSS
11
99
RESERVED
98
RESERVED
SR2CLK (P_PGP05)
M_ACT_90
12
97
DLPBK_BAR
13
96
A15
SLEEP_IN
14
95
A14
AGND
PARIF (MK0)
15
16
94
93
A12
HA0 (PD0)
HA1 (PD1)
17
92
18
91
A13
A11
VDDCORE
HA2 (PD2)
19
90
A10
PD3
HCS# (PD4)
HWT# (PD5)
20
89
PLLGND
CX06833
21
22
88
PLLVDD
87
A09
HRD# (PD6)
23
86
A08
OH# (PE0)
24
25
85
84
A07
VOICE# (PE1)
PARALLEL INTERFACE
(PARIF PIN = HIGH)
VDD
A06
A05
MUTE# (PE2)
NVMDATA (PE3)
27
LCS (PE4)
28
81
A04
VDDCORE
29
80
A03
26
83
82
PE5
30
79
A02
PE6
EXTOH# (PE7)
RING (PA0)
31
78
A01
D0
D1
70
67
68
69
CLKOUT
71
72
65
66
BD2CLK
VGG
D2
64
VDD
VSS
D3
61
62
63
VDDCORE
P_PA03
P_PA00
59
60
P_PA07
P_GP01
SR1IO (PX07)
LPO
56
57
58
IASLEEP (P_PF05)
53
54
55
PD7
NOXYCK
XXCLK
SR4IN
50
51
52
IA1CLK (P_PX03)
VDD
SR4OUT (P_PX00)
SA1CLK (P_PX02)
VSS
SR2IO (P_PX06)
SA2CLK (P_PX05)
SR3OUT
SR3IN (P_PX01)
MCLKOUT (P_PB00)
RES1#
40
41
48
49
73
47
36
45
46
PA3
42
74
43
44
35
39
PA1
PA2
PA6
NVMCLK (PA7)
A00
D7
37
38
77
76
75
PA4
PA5
32
33
34
D6
D5
D4
102228_004
102228A
Conexant
3-3
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-1. CX06833 144-Pin TQFP Pin Signals for Parallel Interface (PARIF = High)
Pin
1
Signal Label
DVDD
I/O
P
Interface
Pin
+3.3V
73
Signal Label
D4
I/O
I/O
Interface
EB: D4
2
CNTLSIN
I
CX06833: SR1IO
74
D5
I/O
EB: D5
3
MCLKIN
I
CX06833: MCLKOUT through 33 Ω
CX06833: SR4OUT
75
D6
I/O
EB: D6
76
D7
I/O
EB: D7
CX06833: IA1CLK through 33 Ω
CX06833: SR4IN
77
A00
O
EB: A00
78
A01
O
EB: A01
79
A02
O
EB: A02
4
TXSIN
I
5
SCLK
O
6
RXOUT
O
7
STROBE
O
8
M_RELAY_A
O
CX06833:SA1CLK through 33 Ω
NC
80
A03
O
EB: A03
9
AGND
G
AGND
81
A04
O
EB: A04
10
DVDD
P
+3.3V
82
A05
O
EB: A05
11
DVSS
G
GND
83
A06
O
EB: A06
12
M_ACT_90
I
NC
84
VDD
P
+3.3V
13
DLPBK_BAR
I
NC
85
A07
O
EB: A07
14
SLEEP_IN
I
CX06833: IASLEEP
86
A08
O
EB: A08
15
AGND
G
AGND
87
A09
O
EB: A09
16
PARIF (MK0)
I
NC (Parallel Host)
88
PLLVDD
P
+3.3V and to GND through 1 µF
17
HA0 (PD0)
I
HB: HA0
89
PLLGND
G
GND
18
HA1 (PD1)
I
HB: HA1
90
A10
O
EB: A10
19
HA2 (PD2)
I
HB: HA2
91
VDDCORE
P
Filter capacitors to GND
20
PD3
I
+3.3V through 47 K
92
A11
O
EB: A11
21
HCS# (PD4)
I
HB: CS#
93
A12
O
EB: A12
22
HWT# (PD5)
I
HB: WT#
94
A13
O
EB: A13
23
HRD# (PD6)
I
HB: RD#
95
A14
O
EB: A14
24
OH# (PE0)
O
DAA: Off-Hook Relay Circuit
96
A15
O
EB: A15
25
VOICE# (PE1)
O
DAA: Voice Relay Circuit (Optional)
97
SR2CLK
(P_PGP05)
I
VC: M_SCK
26
MUTE# (PE2)
O
DAA: Mute Circuit (Optional)
98
RESERVED
I/O
NC
27
NVMDATA (PE3)
I/O
EEPROM: SDA
99
RESERVED
O
NC
28
LCS (PE4)
I
DAA: Line Current Sense Circuit
100
RESERVED
O
NC
29
VDDCORE
P
Filter capacitors to GND
101
RESERVED
O
NC
30
PE5
I
+3.3V through 47 K
102
A16 (PB0)
O
EB: A16
31
PE6
I/O
NC
103
VDD
P
+3.3V
32
EXTOH# (PE7)
I
DAA: Extension Pickup Circuit
(Optional)
104
PB1
I/O
NC
33
RING (PA0)
I
DAA: Ring Detect Circuit
105
ROMSEL# (PB2)
O
EB: ROM CE#
34
PA1
I/O
NC
106
GND
G
GND
35
PA2
I/O
NC
107
RAMSEL# (PB3)
O
EB: RAM CS#
36
PA3
I/O
NC
108
A17 (PB4)
O
EB: A17
37
PA4
I/O
NC
109
A18 (PB5)
O
EB: A18
38
PA5
I/O
NC
110
PB6
I/O
NC
39
PA6
I/O
NC
111
VDD
P
+3.3V
40
NVMCLK (PA7)
O
EEPROM: SCL
112
HINT (PB7)
O
HB: HINT
41
RES1#
I
HB: RESET#
113
TESTP
I
NC
42
SR3OUT
O
VC: M_TXSIN
114
DV1TP
I
Clock Select
43
SR3IN (P_PX01)
I
VC: M_RXOUT
115
CLKIN
I
NC
44
MCLKOUT
(P_PB00)
O
116
XTLI
I
Crystal Circuit
45
SA2CLK
(P_PX05)
I
Through 33 Ω to CX06833:MCLKIN
and VC: M_CLKIN
VC: M_STROBE
117
XTLO
O
Crystal Circuit
46
GND
G
GND
118
VDD
P
+3.3V
47
SR2IO (P_PX06)
O
VC: M_CNTRLSIN
119
NMIP
I
+3.3V
48
VDD
P
+3.3V
120
WT#
O
EB: WRITE#
49
SR4OUT
(P_PX00)
O
CX06833: TXSIN
121
RD#
O
EB: READ#
50
SA1CLK
(P_PX02)
I
CX06833: STROBE through 33 Ω
122
PHS2
O
NC
3-4
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-1. CX06833 144-Pin TQFP Pin Signals for Parallel Interface (PARIF = High) (Continued)
Pin
51
Signal Label
IA1CLK
(P_PX03)
I/O
I
Interface
Pin
CX06833: SCLK through 33 Ω
123
Signal Label
HD0 (PC0)
I/O
I/O
Interface
HB: HD0
52
SR4IN
I
CX06833: RXOUT
124
HD1 (PC1)
I/O
HB: HD1
53
PD7
I/O
NC
125
VDD
P
+3.3V
54
NOXYCK
I
GND
126
HD2 (PC2)
I/O
HB: HD2
55
XXCLK
O
NC
127
HD3 (PC3)
I/O
HB: HD3
56
IASLEEP
(P_PF05)
O
VC: SLEEP
128
HD4 (PC4)
I/O
HB: HD4
57
P_PA07
O
NC
129
GND
G
GND
58
P_GP01
I
NC
130
HD5 (PC5)
I/O
HB: HD5
59
VDDCORE
P
Filter capacitors to GND
131
VDD
P
+3.3V
60
P_PA03
O
NC
132
HD6 (PC6)
I/O
HB: HD6
61
P_PA00
I/O
NC
133
HD7 (PC7)
I/O
HB: HD7
62
SR1IO
(P_PX07)
O
CX06833: CNTLSIN
134
AGND
G
AGND
63
LPO
I
+3.3V through 240K
135
AVDD
P
+3.3VA (Filtered)
64
VDD
P
+3.3V
136
ASPKR
O
AI: Speaker Circuit
65
BD2CLK
O
NC
137
LINE_OUT_P
O
DAA: TXAP
66
VGG
R
+5V or +3.3V
138
LINE_OUT_M
O
DAA: TXAM
67
CLKOUT
O
NC
139
VREF
R
AGND through C circuit
68
D0
I/O
EB: D0
140
VC
R
AGND through C circuit
69
D1
I/O
EB: D1
141
MIC_IN
I
DAA: RXA
70
D2
I/O
EB: D2
142
RES2#
I
HB: RESET#
71
GND
G
GND
143
LINE_IN
I
NC
72
D3
I/O
EB: D3
144
MIC_BIAS
O
NC
102228A
Conexant
3-5
CX06833-3x/4x SMXXD Modem Data Sheet
Figure 3-3. CX06833 Hardware Signals for Serial Interface (PARIF = Low)
116
117
CRYSTAL
CIRCUIT
115
67
NC
NC
114
NC
119
+3.3V
16
54
58
57
60
35
39
124
123
126
130
21
23
SERIAL DTE
INTERFACE
17
128
LED
INTERFACE
41
142
RESET CIRCUIT
240K
+3.3V
47K
+3.3V
47K
+3.3V
47K
+3.3V
47K
+3.3V
63
127
133
20
30
55
65
122
113
NC
61
34
36
37
38
104
110
53
31
NC
112
132
18
19
22
NC
(SERIAL DTE
INTERFACE ONLY)
66
+3.3V OR +5V
29
59
91
0.1
0.1
+3.3V
+3.3V A (FILTERED)
0.1
XTLI
XTLO
CLKIN
CLKOUT
135
46
71
106
129
11
9
15
134
OH# (PE0)
VOICE# (PE1)
MUTE# (PE2)
LCS (PE4)
EXTOH# (PE7)
RING (PA0)
LINE_OUT_P
LINE_OUT_M
MIC_IN
DV1TP
NMIP
PARIF (MK0)
NOXYCK
ASPKR
XTCLK# (P_GP01)
RDCLK# (P_PA07)
TDCLK# (P_PA03)
TXD# (PA2)
RXD# (PA6)
CTS# (PC1)
DSR# (PC0)
RLSD# (PC2)
RI# (PC5)
DTR# (PD4)
RTS# (PD6)
LINE_IN
MIC_BIAS
M_RELAY_A
M_ACT_90
DLPBK_BAR
VREF
40
27
SCL
SDA
24
25
26
28
32
33
137
138
141
EEPROM (OPTIONAL)
OH#
VOICE#
MUTE#
LCS
EXTOH#
RING
TXAP
TXAM
RXA
136
DAA
SPEAKER CIRCUIT
143
144
8
12
13
NC
139
0.1
DTRIND# (PD0)
AAIND# (PC4)
10
AGND
VC
140
RES1#
RES2#
0.1
10
LPO
AGND
PC3
PC7
PD3
PE5
SLEEP_IN
MCLKIN
CNTLSIN
RXOUT
TXSIN
CX06833
SINGLE CHIP
MODEM
STROBE
XXCLK
BD2CLK
PHS2
TESTP
P_PA00
PA1
PA3
PA4
PA5
PB1
PB6
PD7
PE6
PB7
PC6
PD1
PD2
PD5
144-PIN TQFP
SERIAL
INTERFACE
(PARIF = LOW)
SCLK
IA1CLK (P_PX03)
SA1CLK (P_PX02)
SR4OUT (P_PX00)
SR4IN
SR1IO (P_PX07)
IASLEEP (P_PF05)
MCLKOUT (P_PB00)
SR2CLK (P_PGP05)
SA2CLK (P_PX05)
SR3OUT
SR3IN (P_PX01)
SR2IO (P_PX06)
PLLVDD
VDDCORE
VDDCORE
VDDCORE
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
DVDD
DVDD
AVDD
VSS
VSS
VSS
VSS
DVSS
AGND
AGND
AGND
14
3
2
6
4
7
5
33
33
51
50
49
52
62
56
44
97
45
42
43
47
SLEEP
33
M_CLKIN
M_SCK
M_STROBE
M_TXSIN
M_RXOUT
M_CNTRLSIN
88
CX20437
VOICE CODEC
(VC)
(OPTIONAL)
+3.3V
0.1uF
VGG
10
48
64
84
103
111
125
131
118
1
10
NVMCLK (PA7)
NVMDATA (PE3)
PLLGND
A00
A01
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
A16 (PB0)
A17 (PB4)
A18 (PB5)
D0
D1
D2
D3
D4
D5
D6
D7
RD#
WT#
RAMSEL# (PB3)
ROMSEL# (PB2)
RESERVED
RESERVED
RESERVED
RESERVED
89
77
78
79
80
81
82
83
85
86
87
90
92
93
94
95
96
102
108
109
68
69
70
72
73
74
75
76
121
120
107
105
98
99
100
101
EXTERNAL
RAM AND ROM
NC
102228_005
3-6
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
DVDD
CNTLSIN
PB6
A18 (PB5)
111
110
109
TESTP
PB7
VDD
114
113
112
XTLI
CLKIN
DV1TP
NMIP
VDD
XTLO
117
116
115
120
119
118
PHS2
122
121
RD#
WT#
VDD
CTS# (PC1)
DSR# (PC0)
125
124
123
PC3
RLSD# (PC2)
127
126
VSS
AAIND# (PC4)
128
RI# (PC5)
PC7
PC6
VDD
131
130
129
134
133
132
ASPKR
136
135
AVDD
AGND
VREF
LINE_OUT_M
LINE_OUT_P
139
138
137
MIC_IN
VC
141
140
LINE_IN
RES2#
142
144
143
MIC_BIAS
Figure 3-4. CX06833 144-Pin TQFP Pin Signals for Serial Interface (PARIF = Low)
1
2
108
107
MCLKIN
3
106
TXSIN
4
105
A17 (PB4)
RAMSEL# (PB3)
VSS
ROMSEL# (PB2)
SCLK
5
104
PB1
RXOUT
6
103
VDD
A16 (PB0)
RESERVED
STROBE
7
102
M_RELAY_A
8
101
AGND
DVDD
9
10
100
99
DVSS
11
98
RESERVED
RESERVED
M_ACT_90
12
97
RESERVED
SR2CLK (P_PGP05)
DLPBK_BAR
13
96
A15
SLEEP_IN
14
95
A14
AGND
15
94
A13
PARIF (MK0)
DTRIND# (PD0)
16
93
A12
17
92
A11
PD1
PD2
18
19
91
90
VDDCORE
PD3
20
89
DTR# (PD4)
PD5
PLLGND
PLLVDD
22
CX06833
21
88
87
A09
86
A08
RTS# (PD6)
OH# (PE0)
24
VOICE# (PE1)
25
MUTE# (PE2)
NVMDATA (PE3)
26
27
LCS (PE4)
VDDCORE
28
81
29
80
23
SERIAL INTERFACE
(PARIF PIN = LOW)
A10
85
A07
84
VDD
83
82
A05
A06
A04
A03
PE5
30
79
A02
PE6
31
78
A01
70
71
72
D0
D1
D2
67
68
69
CLKOUT
VSS
D3
64
65
66
VDD
BD2CLK
VGG
61
62
63
P_PA00
59
60
VDDCORE
TDCLK# (P_PA03)
SR1IO (P_PX07)
LPO
56
57
58
RDCLK# (P_PA07)
XTCLK# (P_GP01)
54
55
NOXYCK
XXCLK
IASLEEP (P_PF05)
53
IA1CLK (P_PX03)
VDD
SR4OUT (PX00)
SA1CLK (P_PX02)
VSS
SR2IO (P_PX06)
SA2CLK (P_PX05)
SR3OUT
SR3IN (P_PX01)
MCLKOUT (P_PB00)
40
41
RES1#
PD7
D4
SR4IN
73
50
36
51
52
PA3
48
49
D5
47
75
74
45
46
34
35
42
PA1
TXD# (PA2)
43
44
D7
39
A00
76
RXD# (PA6)
NVMCLK (PA7)
77
33
37
38
32
RING (PA0)
PA4
PA5
EXTOH# (PE7
D6
102228_006
102228A
Conexant
3-7
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-2. CX06833 144-Pin TQFP Pin Signals for Serial Interface (PARIF = Low)
Pin
1
Signal Label
DVDD
I/O
P
Interface
Pin
+3.3V
73
Signal Label
D4
I/O
I/O
Interface
EB: D4
2
CNTLSIN
I
CX06833: SR1IO
74
D5
I/O
EB: D5
3
MCLKIN
I
CX06833: MCLKOUT through 33 Ω
CX06833: SR4OUT
75
D6
I/O
EB: D6
76
D7
I/O
EB: D7
CX06833: IA1CLK through 33 Ω
CX06833: SR4IN
77
A00
O
EB: A00
78
A01
O
EB: A01
79
A02
O
EB: A02
4
TXSIN
I
5
SCLK
O
6
RXOUT
O
7
STROBE
O
8
M_RELAY_A
O
CX06833:SA1CLK through 33 Ω
NC
80
A03
O
EB: A03
9
AGND
G
AGND
81
A04
O
EB: A04
10
DVDD
P
+3.3V
82
A05
O
EB: A05
11
DVSS
G
GND
83
A06
O
EB: A06
12
M_ACT_90
I
NC
84
VDD
P
+3.3V
13
DLPBK_BAR
I
NC
85
A07
O
EB: A07
14
SLEEP_IN
I
CX06833: IASLEEP
86
A08
O
EB: A08
15
AGND
G
AGND
87
A09
O
EB: A09
16
PARIF (MK0)
I
GND (Serial DTE)
88
PLLVDD
P
17
DTRIND# (PD0)
O
LED: DTRIND#
89
PLLGND
G
+3.3V and to GND through 1 µF
GND
18
PD1
I/O
NC
90
A10
O
EB: A10
19
PD2
I/O
NC
91
VDDCORE
P
Filter capacitors to GND
20
PD3
I
+3.3V through 47 K
92
A11
O
EB: A11
21
DTR# (PD4)
I
DTE: DTR#
93
A12
O
EB: A12
22
PD5
I/O
NC
94
A13
O
EB: A13
23
RTS# (PD6)
I
DTE: RTS#
95
A14
O
EB: A14
24
OH# (PE0)
O
DAA: Off-Hook Relay Circuit
96
A15
O
EB: A15
25
VOICE# (PE1)
O
DAA: Voice Relay Circuit (Optional)
97
SR2CLK
(P_PGP05)
I
VC: M_SCK
26
MUTE# (PE2)
O
DAA: Mute Circuit (Optional)
98
RESERVED
I/O
NC
27
NVMDATA (PE3)
I/O
EEPROM: SDA
99
RESERVED
O
NC
28
LCS (PE4)
I
DAA: Line Current Sense Circuit
100
RESERVED
O
NC
29
VDDCORE
P
Filter capacitors to GND
101
RESERVED
O
NC
30
PE5
I
+3.3V through 47 K
102
A16 (PB0)
O
EB: A16
31
PE6
I/O
NC
103
VDD
P
+3.3V
32
EXTOH# (PE7)
I
DAA: Extension Pickup Circuit
(Optional)
104
PB1
I/O
NC
33
RING (PA0)
I
DAA: Ring Detect Circuit
105
ROMSEL#
(PB2)
O
EB: ROM CE#
34
PA1
I/O
NC
106
GND
G
GND
35
TXD# (PA2)
I
DTE: TXD#
107
RAMSEL#
(PB3)
O
EB: RAM CS#
36
PA3
I/O
NC
108
A17 (PB4)
O
EB: A17
37
PA4
I/O
NC
109
A18 (PB5)
O
EB: A18
38
PA5
I/O
NC
110
PB6
I/O
NC
39
RXD# (PA6)
O
DTE: RXD#
111
VDD
P
+3.3V
40
NVMCLK (PA7)
O
EEPROM: SCL
112
PB7
O
NC
41
RES1#
I
Reset Circuit
113
TESTP
I
NC
42
SR3OUT
O
VC: M_TXSIN
114
DV1TP
I
Clock Select
43
SR3IN (P_PX01)
I
VC: M_RXOUT
115
CLKIN
I
NC
44
MCLKOUT
(P_PB00)
O
116
XTLI
I
Crystal Circuit
45
SA2CLK
(P_PX05)
I
Through 33 Ω to CX06833:MCLKIN
and VC: M_CLKIN
VC: M_STROBE
117
XTLO
O
Crystal Circuit
46
GND
G
GND
118
VDD
P
+3.3V
47
SR2IO (P_PX06)
O
VC: M_CNTRLSIN
119
NMIP
I
+3.3V
48
VDD
P
+3.3V
120
WT#
O
EB: WRITE#
49
SR4OUT
(P_PX00)
O
CX06833: TXSIN
121
RD#
O
EB: READ#
50
SA1CLK
(P_PX02)
I
CX06833: STROBE through 33 Ω
122
PHS2
O
NC
3-8
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-2. CX06833 144-Pin TQFP Pin Signals for Serial Interface (PARIF = Low) (Continued)
Pin
Signal Label
51
IA1CLK (P_PX03)
I
I/O
52
SR4IN
53
PD7
54
55
Interface
Pin
Signal Label
I/O
Interface
123
I
CX06833: SCLK through 33 Ω
CX06833: RXOUT
124
CTS# (PC1)
O
DTE: CTS#
I/O
NC
125
VDD
P
+3.3V
NOXYCK
I
GND
126
RLSD# (PC2)
O
DTE: RLSD#
XXCLK
O
NC
127
PC3
I/O
+3.3V through 47 K
56
IASLEEP
(P_PF05)
O
VC: SLEEP
128
AAIND# (PC4)
O
LED: AAIND#
57
RDCLK#
(P_PA07)
O
DTE: RDCLK#
129
GND
G
GND
58
XTCLK#
(P_GP01)
I
DTE: XTCLK#
130
RI# (PC5)
O
DTE: RI#
DSR# (PC0)
O
DTE: DSR#
59
VDDCORE
P
Filter capacitors to GND
131
VDD
P
+3.3V
60
TDCLK#
(P_PA03)
O
DTE: TDCLK#
132
PC6
I/O
NC
61
P_PA00
I/O
NC
133
PC7
I/O
+3.3V through 47 K
62
SR1IO (P_PX07)
O
CX06833: CNTLSIN
134
AGND
G
AGND
63
LPO
I
+3.3V through 240K
135
AVDD
P
+3.3VA (Filtered)
64
VDD
P
+3.3V
136
ASPKR
O
AI: Speaker Circuit
65
BD2CLK
O
NC
137
LINE_OUT_P
O
DAA: TXAP
66
VGG
R
+5V or +3.3V
138
LINE_OUT_M
O
DAA: TXAM
67
CLKOUT
O
NC
139
VREF
R
AGND through C circuit
68
D0
I/O
EB: D0
140
VC
R
AGND through C circuit
69
D1
I/O
EB: D1
141
MIC_IN
I
DAA: RXA
70
D2
I/O
EB: D2
142
RES2#
I
71
GND
G
GND
143
LINE_IN
I
NC
72
D3
I/O
EB: D3
144
MIC_BIAS
O
NC
102228A
Conexant
3-9
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-3. CX06833 Pin Signal Definitions
Label
Pin
I/O
I/O Type
Signal Name/Description
COMMON TO PARALLEL HOST AND SERIAL DTE INTERFACE CONFIGURATIONS
System
XTLI,
XTLO
116,
117
I,
O
Ix,
Ox
Crystal In and Crystal Out. If an external 28.224 MHz crystal circuit is used
instead of an external clock circuit, connect XTLI and XTLO to the external
crystal circuit and leave CLKIN open.
CLKIN
115
I
It
Clock In. If an external 28.224 MHz clock circuit is used instead of an
external crystal circuit, connect CLKIN to the clock output and leave XTLI
and XTLO open.
CLKOUT
67
O
It/Ot2
Clock Out. 28.224 MHz output clock. Leave open.
DV1TP
114
I
Itpu
Clock Input Select. This input is used to choose the clock input. Connect to
+3.3V or leave open to select XTLI as the clock input. Connect to GND to
select CLKIN as the clock input.
NOXYCK
54
PARIF
16
I
Itpu
Parallel/Serial Interface Select. PARIF input high (open) selects parallel
host interface operation. PARIF low (GND) selects serial DTE interface
operation.
NMI#
119
I
Ithpu
Non-Maskable Interrupt. Not used. Connect to +3.3V.
RES1#
RES2#
41
142
I
It
Reset. The active low RES1# and RES2# input resets the CX06833 logic,
and restores the saved configuration from serial EEPROM or returns the
modem to the factory default values if EEPROM is not present.
RESET# low holds the modem in the reset state; RESET# going high
releases the modem from the reset state. After application of VDD, RESET#
must be held low for at least 15 ms after the VDD power reaches operating
range. The modem device set is ready to use 25 ms after the low-to-high
transition of RESET#.
For parallel Interface, connect RESET# input to the host bus RESET line
through an inverter.
For serial Interface, connect RESET# input to a reset switch circuit.
Power and Ground
VGG
66
P
PWRG
I/O Signaling Voltage Source. Connect to +5V or +3.3V.
VDD
48, 64,
84, 103,
111, 118,
125, 131
P
PWR
Digital Supply Voltage for Digital Circuits. Connect to +3.3V.
DVDD
1, 10
P
PWR
Digital Supply Voltage for Analog Circuits. Connect to +3.3V
AVDD
135
P
PWR
Analog Supply Voltage for Analog Circuits. Connect to analog power.
VSS
46, 71,
106, 129
G
GND
Digital Ground for Digital Circuits. Connect to digital ground.
DVSS
11
G
GND
Digital Ground for Analog Circuits. Connect to digital ground.
AGND
9, 15,
134
G
AGND
Analog Ground for Analog Circuits. Connect to analog ground.
VDDCORE
29, 59,
91
P
PWR
Core Voltage. +1.8V internally generated by a voltage regulator connected
to the VDD input pins. VDDCORE is routed externally for decoupling to GND
though capacitors.
PLLVDD
88
P
PWR
Supply Voltage for PLL Circuit. Connect to +3.3V and to analog ground
through 0.1 µF.
PLLGND
89
G
GND
NVMCLK (PA7)
40
O
It/Ot2
EEPROM Clock. NVMCLK output high enables the EEPROM. Connect to
the EEPROM SCL pin.
NVMDATA
(PE3)
27
I/O
It/Ot2
EEPROM Data. NVMDATA supplies serial data to and from the EEPROM.
Connect to the EEPROM SDA pin and to +3.3V through 10 KΩ.
3-10
Digital Ground for PLL Circuit. Connect to digital ground.
Serial EEPROM (EEPROM) Interface
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-3. CX06833 Pin Signal Definitions (Continued)
Label
Pin
I/O
I/O Type
Signal Name/Description
External Bus Interface
A00-A06,
A07-A09,
A10
A11-A15,
A16 (PB0),
A17 (PB4),
A18 (PB5)
77-83,
85-87,
90,
92-96,
102,
108,
109
O,
O,
O,
O,
O,
O,
O
It/Ot8,
It/Ot8,
It/Ot2,
It/Ot2,
It/Ot2,
It/Ot2,
It/Ot2
Address Lines 0-18. A0-A18 are the address output lines used to access
external memory; up to 4 Mbits (512k bytes) flash ROM using A0-A18 and up
to 1 Mbit (128k bytes) RAM using A0-A16.
D0-D2,
D3-D7
68-70,
72-76
I/O
Ith/Ot2
Data Line 0-7. D0-D7 are bidirectional external memory bus data lines.
READ#
121
O
It/Ot2
Read Enable. READ# output low enables data transfer from the selected
device to the D0-D7 lines.
WRITE#
120
O
It/Ot2
Write Enable. WRITE# output low enables data transfer from the D0-D7
lines to the selected device.
RAMSEL# PB3)
107
O
It/Ot2
RAM Select. RAMSEL# output low selects the external RAM.
ROMSEL# (PB2)
105
O
Ot2
OH# (PE0)
24
O
It/Ot2
Off-Hook Relay Control. The active low output can be used to control the
normally open off-hook relay.
VOICE# (PE1)
25
O
It/Ot2
Voice Relay Control. The active low VOICE# output can optionally be used
to switch the handset from the telephone line to the voice codec interface to
be used as a microphone and speaker. Leave open if not used.
MUTE# (PE2)
26
O
It/Ot2
Mute Relay Control. The active low MUTE# output can optionally be used to
used to control the normally open mute relay. Leave open if not used.
LCS (PE4)
28
I
It/Ot2
Loop Current Sense. LCS is an active high input that indicates a handset
off-hook status.
EXTOH# (PE7)
32
I
It/Ot2
Extension Off-Hook. Active low input optionally used to indicate when the
telephone handset connected to the modem goes off-hook state. Connect to
+3.3V through 47K Ω if not used.
RING (PA0)
33
I
It/Ot2
Ring Frequency. A rising edge on the RING input initiates an internal ring
frequency measurement. The RING input from an external ring detect circuit
is monitored to determine when to wake up from sleep or stop mode. The
RING input is typically connected to the output of an optoisolator or
equivalent. The idle state (no ringing) output of the ring detect circuit should
be low.
LINE_OUT_P,
LINE_OUT_M
137,
138
O,
O
O(DF)
Transmit Analog 1 and 2. The LINE_OUT_P and LINE_OUT_M outputs are
differential outputs 180 degrees out of phase with each other. Each output
can drive a 300 Ω load. Connect LINE_OUT_P and LINE_OUT_M to the
DAA telephone line interface transmit circuit.
MIC_IN
141
I
I(DA)
Receive Analog. MIC_IN is a single-ended input from the telephone line
interface or an optional external hybrid circuit with 70K Ω input impedance.
Connect MIC_IN to the DAA telephone line interface receive circuit.
VREF
139
R
REF
High Voltage Reference. Connect to AGND through 10 µF (polarized,
+ terminal to VREF) and 0.1 µF (ceramic) in parallel. Ensure a very close
proximity between these capacitors and VREF pin. Use a short path and a
wide trace to AGND pin.
VC
140
R
REF
Low Voltage Reference. Connect to AGND through 10 µF (polarized,
+ terminal to VC) and 0.1 µF (ceramic) in parallel. Ensure a very close
proximity between these capacitors and VC pin. Use a short path and a wide
trace to AGND pin.
102228A
ROM Select. ROMSEL# output low selects the external flash ROM.
Telephone Line/Telephone/Audio Interface Signals and Reference Voltage
Conexant
3-11
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-3. CX06833 Pin Signal Definitions (Continued)
Label
Pin
I/O
I/O Type
Signal Name/Description
Telephone Line/Telephone/Audio Interface Signals and Reference Voltage (Continued)
ASPKR
136
O
O(DF)
Speaker Analog Output. The ASPKR analog output can originate from one
of five different sources: RIN, TELIN, MICM or MICV or from the MDP’s
internal voice playback mode. The ASPKR on/off and three levels of
attenuation are controlled by bits in DSP RAM. When the speaker is turned
off, the ASPKR output is clamped to the voltage at the VC pin. The ASPKR
output can drive an impedance as low as 300 Ω. In a typical application, the
ASPKR output is an input to an external LM386 audio power amplifier.
LINE_IN
143
I
I(DA)
Not Used. Leave open.
MIC_BIAS
144
O
Oa
Not Used. Leave open.
M_RELAYA
8
O
Ot
Not Used. Leave open.
Not Used. Leave open.
M_ACT90
12
I
Itpu
DLPBK_BAR
13
I
It
SLEEP_IN
14
I
Itpd
Modem Codec Sleep In. Connect to CX06833: IASLEEP pin.
MCLKIN
3
I
Ipd
Modem Codec Serial Clock In. Connect to CX06833: MCLKOUT pin
through 33 Ω.
Not Used. Leave open.
CX06833 Interconnect and Optional CX20437 VC Interface
CNTLSIN
2
I
Itpd
Modem Codec Serial Control In. Connect to CX06833: SR1IO pin.
RXOUT
6
O
Ot2
Modem Codec Serial Receive Data Out. Connect to CX06833: SR4IN pin.
TXSIN
4
I
Itpd
Modem Codec Serial Transmit Data In. Connect to CX06833: SR4OUT
pin.
STROBE
7
O
Ot2
Modem Codec Serial Frame Sync Out. Connect to CX06833: SA1CLK pin
through 33 Ω.
SCLK
5
O
Ot2
Modem Codec Serial Clock Out. Connect to CX06833: IA1CLK pin through
33 Ω.
IA1CLK
(P_PX03)
51
I
Itpu/Ot2
DSP Modem Serial Clock In. Connect to CX06833: SCLK pin through 33 Ω.
SA1CLK
(P_PX02)
50
I
Itpu/Ot2
DSP Modem Serial Frame Sync In. Connect to CX06833: STROBE pin
through 33 Ω.
SR4OUT
(P_PX00)
49
O
Itk/Ot2
DSP Modem Serial Transmit Data Out. Connect to CX06833: TXSIN pin.
SR4IN
52
I
Itk/Ot2
DSP Modem Serial Receive Data In. Connect to CX06833: RXOUT pin.
SR1IO
(P_PX07)
62
O
Itk/Ot2
DSP Modem Serial Control Out. Connect to CX06833: CNTLSIN pin.
IASLEEP
(P_PF05)
56
O
Ot2
DSP Sleep Out. Connect to CX06833: SLEEP_IN pin and to VC SLEEP pin.
M_CLKOUT
(P_PB00)
44
O
It/Ot2
DSP Master Serial Clock Out. Connect through 33 Ω to CX06833: MCLKIN
pin and to VC M_CLKIN pin.
SR2CLK
(P_PGP05)
97
I
Itpu/Ot2
DSP Voice Serial Clock In. Connect to VC M_SCK pin. Leave open if VC is
not installed.
SA2CLK
(P_PX05)
45
I
Itpu/Ot2
DSP Voice Serial Frame Sync In. Connect to VC M_STROBE pin. Leave
open if VC is not installed.
SR3OUT
42
O
Ot2
DSP Voice Serial Transmit Data Out. Connect to VC M_TXSIN pin. Leave
open if VC is not installed.
SR3IN
(P_PX01)
43
I
Itk/Ot2
DSP Voice Serial Receive Data In. Connect to VC M_RXOUT pin. Leave
open if VC is not installed.
SR2IO
(P_PX06)
47
O
It/Ot2
DSP Voice Serial Control Out. Connect to VC M_CNTRLSIN pin. Leave
open if VC is not installed.
3-12
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-3. CX06833 Pin Signal Definitions (Continued)
Label
Pin
I/O
I/O Type
Signal Name/Description
Not Used – Connect to +3.3V through Resistor
LPO
63
I
I/O
Low Power Oscillator. Not used. Connect to +3.3V through 240 KΩ.
PC3
127
I
Ith/Ot2
Port PC3. Not used. Connect to +3.3V through 47K Ω.
PC7
133
I
Ith/Ot2
Port PC7. Not used. Connect to +3.3V through 47K Ω.
PD3
20
I
Ith/Ot2
Port PD7. Not used. Connect to +3.3V through 47K Ω.
PE5
30
HCS# (PD4)
21
I
It
Host Bus Chip Select. HCS# input low enables the MCU host bus interface.
HRD# (PD6)
23
I
Ithpu
Host Bus Read. HRD# is an active low, read control input. When HCS# is
low, HRD# low allows the host to read status information or data from a
selected MCU register.
HWT# (PD5)
22
I
Ithpu
Host Bus Write. HWT# is an active low, write control input. When HCS# is
low, HWT# low allows the host to write data or control words into a selected
MCU register.
HINT (PB7)
112
O
It/Ot8
Host Bus Interrupt. HINT output is set high when the receiver error flag,
received data available, transmitter holding register empty, or modem status
interrupt is asserted. HINT is reset low upon the appropriate interrupt service
or master reset operation.
HA0-HA2
(PD0-PD2)
17-19
I
Ithpd/Ot2
Host Bus Address Lines 0-2. During a host read or write operation with
HCS# low, HA0-HA2 select an internal MCU 16550A-compatible register.
HD0-HD7
(PC0-PC7)
123-124,
126-128,
130-133
I/O
Ith/Ot8
BD2CLK
65
O
Itpu/Ot2
Not Used. Leave open.
DV1TP
114
I
Itpu
Not Used. Leave open.
PHS2
122
O
Ot2
Not Used. Leave open.
TESTP
113
I
Itpu
Not Used. Leave open.
XXCLK
55
O
It/Ot2
Not Used. Leave open.
P_GP01
58
I
It
Port P_GP01. Leave open.
I
Ith/Ot2
Port PE5. Not used. Connect to +3.3V through 47K Ω.
PARALLEL HOST BUS CONFIGURATION ONLY (PARIF = HIGH)
Parallel Host Interface
Host Bus Data Lines 0-7. HD0-HD7 are three-state input/output lines
providing bidirectional communication between the host and the MCU. Data,
control words, and status information are transferred over HD0-HD7.
Not Used (In Parallel Host Interface Configuration)
P_PA00
61
I/O
Itpu/Ot2
Port P_PA00. Leave open.
P_PA03
60
O
Ot2
Port P_PA03. Leave open.
P_PA07
57
O
Ot2
Port P_PA07. Leave open.
PA1
34
I/O
It/Ot2
Port PA1. Leave open.
PA2
35
I/O
It/Ot2
Port PA2. Leave open.
PA3
36
I/O
Itpu/Ot2
Port PA3. Leave open.
PA4
37
I/O
Itpu/Ot2
Port PA4. Leave open.
PA5
38
I/O
It/Ot2
Port PA5. Leave open.
PA6
39
I/O
It/Ot2
Port PA6. Leave open.
PB1
104
I/O
It/Ot2
Port PB1. Leave open.
PB6
110
I/O
It/Ot2
Port PB6. Leave open.
PD7
53
I/O
It/Ot2
Port PD7. Leave open.
PE6
31
I/O
It/Ot2
Port PE6. Leave open.
RESERVED
98-101
102228A
Reserved. Connected to internal circuitry. Leave open.
Conexant
3-13
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-3. CX06833 Pin Signal Definitions (Continued)
Label
Pin
I/O
I/O Type
Signal Name/Description
SERIAL DTE INTERFACE CONFIGURATION ONLY (PARIF = LOW)
V.24 (EIA/TIA-232-E) DTE Serial Interface
XTCLK#
(P_GP01)
58
I
It/Ot2
External Data Clock. Synchronous External Transmit Data Clock input in
synchronous modes. Leave open if not used.
RDCLK#
(P_PA07)
57
O
Itpu/Ot2
Receive Data Clock. Synchronous Receive Data Clock output in
synchronous modes. The RDCLK frequency is the data rate (±0.01%) with a
duty cycle of 50±1%. Leave open if not used.
TDCLK#
(P_PA03)
60
O
Itpu/Ot2
Transmit Data Clock. Synchronous Transmit Data Clock output in
synchronous modes. The TDCLK# frequency is the data rate (±0.01%) with a
duty cycle of 50±1%. Leave open if not used.
TXD# (PA2)
35
I
It/Ot2
Transmitted Data (EIA BA/ITU-T CT103). The DTE uses the TXD# line to
send data to the modem for transmission over the telephone line or to
transmit commands to the modem.
RXD# (PA6)
39
O
It/Ot2
Received Data (EIA BB/ITU-T CT104). The modem uses the RXD# line to
send data received from the telephone line to the DTE and to send modem
responses to the DTE. During command mode, RXD# data represents the
modem responses to the DTE.
CTS# (PC1)
124
O
Ith/Ot8
Clear To Send (EIA CB/ITU-T CT106). CTS# output ON (low) indicates that
the modem is ready to accept data from the DTE. In asynchronous
operation, in error correction or normal mode, CTS# is always ON (low)
unless RTS/CTS flow control is selected by the &Kn command.
In synchronous operation, the modem also holds CTS# ON during
asynchronous command state. The modem turns CTS# OFF immediately
upon going off-hook and holds CTS# OFF until both DSR# and RLSD# are
ON and the modem is ready to transmit and receive synchronous data. The
modem can also be commanded by the &Rn command to turn CTS# ON in
response to an RTS# OFF-to-ON transition.
DSR# (PC0)
123
O
Ith/Ot8
Data Set Ready (EIA CC/ITU-T CT107). DSR# indicates modem status to
the DTE. DSR# OFF (high) indicates that the DTE is to disregard all signals
appearing on the interchange circuits except Ring Indicator (RI#). DSR#
output is controlled by the AT&Sn command.
RLSD# (PC2)
126
O
Ith/Ot8
Received Line Signal Detector (EIA CF/ITU-T CT109). When AT&C0
command is not in effect, RLSD# output is ON when a carrier is detected on
the telephone line or OFF when carrier is not detected.
RI# (PC5)
130
O
Ith/Ot8
Ring Indicator (EIA CE/ITU-T CT125). RI# output ON (low) indicates the
presence of an ON segment of a ring signal on the telephone line.
DTR# (PD4)
21
I
It
Data Terminal Ready (EIA CD/ITU-T CT108). The DTR# input is turned ON
(low) by the DTE when the DTE is ready to transmit or receive data. DTR#
ON prepares the modem to be connected to the telephone line, and
maintains the connection established by the DTE (manual answering) or
internally (automatic answering). DTR# OFF places the modem in the
disconnect state under control of the &Dn and &Qn commands.
RTS# (PD6)
23
I
Ithpu
Request To Send (EIA CA/ITU-T CT105). RTS# input ON (low) indicates
that the DTE is ready to send data to the modem. In the command state, the
modem ignores RTS#.
In asynchronous operation, the modem ignores RTS# unless RTS/CTS flow
control is selected by the &Kn command. In synchronous on-line operation,
the modem can be commanded by the &Rn command to ignore RTS# or to
respond to RTS# by turning on CTS# after the delay specified by Register
S26.
3-14
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-3. CX06833 Pin Signal Definitions (Continued)
Label
Pin
I/O
I/O Type
Signal Name/Description
SERIAL DTE INTERFACE CONFIGURATION ONLY (PARIF = LOW) (CONTINUED)
LED Indicator Interface
AAIND# (PC4)
128
O
Ith/Ot8
DTRIND# (PD0)
17
O
Ithpd/Ot2
BD2CLK
65
O
Itpu/Ot2
Not Used. Leave open.
PHS2
122
O
Ot2
Not Used. Leave open.
Auto Answer Indicator. AAIND# output ON (low) corresponds to the
indicator on. AAIND# output is active when the modem is configured to
answer the ring automatically (ATS0 command ≠ 0).
DTR Indicator. DTRIND# output ON (low) corresponds to the indicator on.
The DTRIND# state reflects the DTR# output state except when the &D0
command is active, in which case DTRIND# is low.
Not Used (In Serial DTE Interface Configuration)
TESTP
113
I
Itpu
Not Used. Leave open.
XXCLK
55
O
It/Ot2
Not Used. Leave open.
P_PA00
61
I/O
Itpu/Ot2
Port P_PA00. Leave open.
PA1
34
I/O
It/Ot2
Port PA1. Leave open.
PA3
36
I/O
Itpu/Ot2
Port PA3. Leave open.
PA4
37
I/O
Itpu/Ot2
Port PA4. Leave open.
PA5
38
I/O
It/Ot2
Port PA5. Leave open.
PB1
104
I/O
It/Ot2
Port PB1. Leave open.
PB6
110
I/O
It/Ot2
Port PB6. Leave open.
PC6
132
I/O
Ith/Ot8
Port PC6. Leave open.
PD1
18
I/O
Ithpd/Ot2
Port PD1. Leave open.
PD2
19
I/O
Ithpd/Ot2
Port PD2. Leave open.
PD5
22
I/O
Ithpu
Port PD5. Leave open.
PD7
53
I/O
It/Ot2
Port PD7. Leave open.
PE2
26
I/O
It/Ot2
Port PE2. Leave open.
PE6
31
I/O
It/Ot2
Port PE6. Leave open.
RESERVED
98-101
Reserved. Connected to internal circuitry. Leave open.
Notes:
1. I/O Types: See Table 3-4.
2. Interface Legend:
EB
Expansion Bus
HB
Host Bus
NC
No internal pin connection
VC
Voice Codec
RESERVED = No external connection allowed (may have internal connection).
102228A
Conexant
3-15
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-4. CX06833 I/O Type Definitions
I/O Type
Ix/Ox
It/Ot2
Description
Digital input, +5V tolerant/ Digital output, 2 mA, ZINT = 120 Ω
Itk/Ot2
Digital input, +5V tolerant, keeper/ Digital output, 2 mA, ZINT = 120 Ω
Itpu/Ot2
Digital input, +5V tolerant, 75k Ω pull up/ Digital output, 2 mA, ZINT = 120 Ω
It/Ot8
Digital input, +5V tolerant,/ Digital output, 8 mA, ZINT = 50 Ω
Ithpd/Ot2
Digital input, +5V tolerant, hysteresis, 75k Ω pull down/ Digital output, 2 mA, ZINT = 120 Ω
Ith/Ot2
Digital input, +5V tolerant, hysteresis/Digital output, 2 mA, ZINT = 120 Ω
Ith/Ot8
Digital input, +5V tolerant, hysteresis/Digital output, 8 mA, ZINT = 50 Ω
It
Itk
Itkpu
Digital input, +5V tolerant
Digital input, +5V tolerant, keeper
Itpu
Digital input, +5V tolerant, 75k Ω pull up
Ithpu
Digital input, +5V tolerant, hysteresis, 75k Ω pull up
Ot2
Digital output, three-state, 2 mA, ZINT = 120 Ω
I/O, wire
Digital input, +5V tolerant, keeper, 75k Ω pull up
PWR
VCC Power
PWRG
VGG Power
GND
Ground
Notes:
1. See DC characteristics in Table 3-5.
2. I/O Type corresponds to the device Pad Type. The I/O column in signal interface tables refers to signal I/O direction used in
the application.
Table 3-5. CX06833 DC Electrical Characteristics
Parameter
Symbol
Min.
Typ.
Max.
Units
Input Voltage Low
+5V tolerant
+5V tolerant hysteresis
Input Voltage High
+5V tolerant
+5V tolerant hysteresis
Input Hysteresis
+3V hysteresis
+5V tolerant, hysteresis
Output Voltage Low
VIL
0
0
0.8
0.3 *VGG
5.25
5.25
0.5
0.3
–
–
–
–
–
–
–
–
V
V
V
V
V
V
V
V
0
–
0.4
V
IOL = 2 mA
0
–
0.4
V
IOL = 8 mA
ZINT = 120 Ω
2.4
–
–
VDD
V
V
IOL = -2 mA
ZINT = 50 Ω
Pull-Up Resistance
2.4
–
VDD
V
IOL = -8 mA
Rpu
50
–
200
kΩ
Pull-Down Resistance
Rpd
50
–
200
VIH
2
0.7 * VDD
VH
VOL
ZINT = 120 Ω
ZINT = 50 Ω
Output Voltage High
Test Conditions
VOH
kΩ
Test Conditions unless otherwise stated: VDD = +3.3 ± 0.3 VDC; TA = 0°C to 70°C; external load = 50 pF.
3-16
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
3.2
CX20442 VC Hardware Pins and Signals (S Models)
3.2.1
CX20442 VC Signal Summary
Microphone and analog speaker interface signals, as well as telephone handset/headset
interface signals are provided to support functions such as speakerphone mode, telephone
emulation, microphone voice record, speaker voice playback, and call progress monitor.
3.2.1.1
Speakerphone Interface
The following signals are supported:
•
•
3.2.1.2
Speaker Out (M_SPKR_OUT); analog output - Should be used in speakerphone
designs where sound quality is important
Microphone (M_MIC_IN); analog input
Telephone Handset/Headset Interface
The following interface signals are supported:
•
•
•
3.2.1.3
Telephone Input (M_LINE_IN), input (TELIN) - Optional connection to a telephone
handset interface circuit
Telephone output (M_LINE_OUTP); output (TELOUT) - Optional connection to a
telephone handset interface circuit
Center Voltage (VC); output reference voltage
CX06833 Modem Interface
The following interface signals are supported:
•
•
•
•
•
•
•
3.2.1.4
Sleep (SLEEP); input
Master Clock (M_CLKIN); input
Serial Clock (M_SCK); output
Control (M_CNTRLSIN); input
Serial Frame Sync (M_STROBE); output
Serial Transmit Data (M_TXSIN); input
Serial Receive Data (M_RXOUT); output
Host Interface
The following interface signals are supported:
•
102228A
Reset (POR); input
Conexant
3-17
CX06833-3x/4x SMXXD Modem Data Sheet
3.2.2
CX20442 VC Pin Assignments and Signal Definitions
VC 32-pin TQFP hardware interface signals are shown by major interface in Figure 3-5,
are shown by pin number in Figure 3-6, and are listed by pin number in Table 3-6.
VC hardware interface signals are defined in Table 3-7.
VC pin signal DC electrical characteristics are defined in
Table 3-8.
VC pin signal analog electrical characteristics are defined in Table 3-9.
3-18
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Figure 3-5. CX20442 VC Hardware Interface Signals
CX06833
1
4
19
21
23
20
22
18
IASLEEP
DRESET#
M_CLK
V_SCLK
V_STROBE
V_TXSIN
V_RXOUT
V_CTRL
2
M_DIG_SPEAKER
SLEEP
POR
M_CLKIN
M_SCK
M_STROBE
M_TXSIN
M_RXOUT
M_CNTRLSIN
M_MIC_IN
M_SPKR_OUT
14
9
M_LINE_IN
M_LINE_OUTP
17
25
5
VAA (+3.3V)
28
26
MAVDD
VSS
SET3V_BAR2
CX20442
Voice Codec
(VC)
32-Pin TQFP
AUDIO
CIRCUIT
TELIN
TELOUT
HANDSET
INTERFACE
11
0.1uF
VDD
VDD
MIC
SPKOUT
10
M_LINE_OUTM
VREF
+3.3V
NC
13
3
12
VC
10uF
AGND
0.1uF
10uF
GND
6
27
MAVSS
VSUB
15
24
16
29
30
31
7
8
32
M_MIC_BIAS
M_RELAYA
M_RELAYB
M_ACT90
M_1BIT_OUT
D_LPBK_BAR
NC
NC
NC
AGND
AGND
NC
102228_007
M_ACT90
VSS
VSUB
SET3V_BAR2
VDD
29
28
27
26
25
NC
D_LPBK_BAR
M_1BIT_OUT
32
31
30
Figure 3-6. CX20442 VC 32-Pin TQFP Pin Signals
M_RELAYA
SLEEP
1
24
M_DIG_SPEAKER
2
23
M_STROBE
M_SPKR_OUT
3
22
M_RXOUT
POR
4
21
M_SCK
MAVDD
5
20
M_TXSIN
MAVSS
6
19
M_CLKIN
NC
7
18
M_CNTRLSIN
NC
8
17
VDD
9
10
11
12
13
14
15
16
M_LINE_OUTP
M_LINE_OUTM
VREF
VC
M_MIC_IN
M_LINE_IN
M_MIC_BIAS
M_RELAYB
CX20442
102228_008
102228A
Conexant
3-19
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-6. CX20442 VC 32-Pin TQFP Pin Signals
Pin
Signal Label
I/O
Interface
1
SLEEP
I
CX06833: IASLEEP
2
M_DIG_SPEAKER
O
NC
3
M_SPKR_OUT
O
Speaker interface circuit
4
POR
I
Host: RESET# or reset circuit
5
MAVDD
P
VAA (+3.3V)
6
MAVSS
G
AGND
7
NC
8
NC
9
M_LINE_OUTP
O
Handset interface circuit: TELOUT
10
M_LINE_OUTM
O
NC
11
VREF
AGND through capacitors
12
VC
AGND through capacitors
NC
NC
13
M_MIC_IN
I
Microphone interface circuit
14
M_LINE_IN
I
Handset interface circuit: TELIN
15
M_MIC_BIAS
16
M_RELAYB
NC
17
VDD
P
+3.3V
18
M_CNTRLSIN
I
CX06833: V_CTRL
NC
19
M_CLKIN
I
CX06833: M_CLK
20
M_TXSIN
I
CX06833: V_TXSIN
21
M_SCK
O
CX06833: V_SCLK
22
M_RXOUT
O
CX06833: V_RXOUT
23
M_STROBE
O
CX06833: V_STROBE
24
M_RELAYA
O
NC
25
VDD
P
+3.3V
26
M_SET3V_BAR2
I
GND
27
VSUB
G
AGND
28
VSS
G
GND
29
M_ACT90
I
NC
30
M_1BIT_OUT
O
NC
31
D_LPBK_BAR
I
NC
32
NC
3-20
NC
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-7. CX20442 VC Pin Signal Definitions
Label
Pin
I/O
I/O Type
Signal Name/Description
System Signals
VDD
17, 25
P
PWR
Digital Power Supply. Connect to +3.3V and digital circuits power
supply filter.
MAVDD
5
P
PWR
Analog Power Supply. Connect to +3.3V and analog circuits
power supply filter.
VSS
28
G
GND
Digital Ground. Connect to GND.
MAVSS
6
G
AGND
Analog Ground. Connect to AGND.
VSUB
27
G
GND
Analog Ground. Connect to AGND.
POR
4
I
Itpu
Power-On Reset. Active low reset input. Connect to Host
RESET# or reset circuit.
SET3V_BAR2
26
I
Itpu
Set +3.3V Analog Reference. Connect to GND.
CX06833 Interconnect
SLEEP
1
I
Itpd
IA Sleep. Active high sleep input. Connect to CX06833 IASLEEP
pin.
M_CLKIN
19
I
Itpd
Master Clock Input. Connect to CX06833 M_CLK pin.
M_SCK
21
O
Ot2
Serial Clock Output. Connect to CX06833 V_SCLK pin.
M_CNTRL_SIN
18
I
Itpd
Control Input. Connect to CX06833 V_CTRL pin.
M_STROBE
23
O
Ot2
Serial Frame Sync. Connect to CX06833 V_STROBE pin.
M_TXSIN
20
I
Itpd
Serial Transmit Data. Connect to CX06833 V_TXSIN pin.
M_RXOUT
22
O
Ot2
M_MIC_IN
13
I
I(DA)
M_SPKR_OUT
3
O
O(DF)
M_LINE_OUTP
9
O
O(DF)
Telephone Handset Out (TELOUT). Single-ended analog data
output to the telephone handset circuit. The output can drive a
300 Ω load.
M_LINE_IN
14
I
I(DA)
Telephone Handset Out (TELIN). Single-ended analog data input
from the telephone handset circuit.
102228A
Serial Receive Data. Connect to CX06833 V_RXOUT pin.
Microphone/Speaker Interface
Microphone Input. Single-ended analog input from the
microphone circuit.
Modem Speaker Analog Output. The M_SPKR_OUT analog
output reflects the received analog input signal. The
M_SPKR_OUT on/off and three levels of attenuation are controlled
by bits in DSP RAM. When the speaker is turned off, the
M_SPKR_OUT output is clamped to the voltage at the VC pin. The
M_SPKR_OUT output can drive an impedance as low as 300 Ω. In
a typical application, the M_SPKR_OUT output is an input to an
external LM386 audio power amplifier.
Handset/Headset Interface
Conexant
3-21
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-7. CX20442 VC Pin Signal Definitions (Continued)
Label
Pin
I/O
I/O Type
Signal Name/Description
Reference Voltage
VREF
11
R
REF
High Voltage Reference. Connect to analog ground through
10 µF (polarized, + terminal to VREF) and 0.1 µF (ceramic) in
parallel. Ensure a very close proximity between these capacitors
and VREF pin.
VC
12
R
REF
Low Voltage Reference. Connect to analog ground through 10 µF
(polarized, + terminal to VC) and 0.1 µF (ceramic) in parallel.
Ensure a very close proximity between these capacitors and VC
pin.
For handset interface, also connect to handset interface circuit
(VC_HAND).
Not Used
M_DIG_SPEAKER
2
O
Ot2
Not Used. Leave open.
M_LINE_OUTM
10
O
Oa
Not Used. Leave open.
M_RELAYA
24
O
Ot
Not Used. Leave open.
M_RELAYB
16
O
Ot
Not Used. Leave open.
M_MIC_BIAS
15
O
Oa
Not Used. Leave open.
M_ACT90
29
I
Itpu
Not Used. Leave open.
M_1BIT_OUT
30
O
Ot2
Not Used. Leave open.
D_LPBK_BAR
31
I
It
Not Used. Leave open.
NC
7, 8, 32
Notes:
1. I/O types*:
Ia
It
Itpd
Itpu
Oa
Ot2
Internal No Connect. Leave open.
Analog input
Digital input, TTL-compatible
Digital input, TTL-compatible, internal 75k ± 25k Ω pull-down
Digital input, TTL-compatible, internal 75k ± 25k Ω pull-up
Analog output
Digital output, TTL-compatible, 2 mA, ZINTERNAL = 120 Ω
Ot2od
Digital output, TTL-compatible, 2 mA, open drain, ZINTERNAL = 120 Ω
AGND
GND
Analog Ground
Digital Ground
Table 3-8. CX20442 VC DC Electrical Characteristics
Symbol
Min.
Typ.
Max.
Units
Input Voltage
Parameter
VIN
-0.30
–
VDD+0.3
V
Input Voltage Low
VIL
VIH
-0.30
–
0.2 *VDD
V
Input Voltage High
0.4*VDD
–
VDD+0.3
V
Output Voltage Low
VOL
0
–
0.4
V
Test Conditions
Output Voltage High
VOH
0.8*VDD
–
VDD
V
Input Leakage Current
–
-10
–
10
µA
Output Leakage Current (High
–
-10
–
10
µA
Impedance)
Test Conditions unless otherwise stated: VDD = +3.3 ± 0.3 VDC; TA = 0°C to 70°C; external load = 50 pF
3-22
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-9. CX20442 VC Analog Electrical Characteristics
Signal Name
M_LINE_IN,
Type
I (DA)
Characteristic
Input Impedance
O (DD)
AC Input Voltage Range
Reference Voltage
Minimum Load
M_MIC_IN
M_LINE_OUTP
Maximum Capacitive Load
Output Impedance
AC Output Voltage Range
M_SPKR_OUT
O (DF)
Reference Voltage
DC Offset Voltage
Minimum Load
Maximum Capacitive Load
Output Impedance
Value
> 70K Ω
1.1 VP-P
+1.35 VDC
300 Ω
0 µF
10 Ω
1.4 VP-P (with reference to ground and a
600 Ω load)
+1.35 VDC
± 200 mV
300 Ω
0.01 µF
10 Ω
AC Output Voltage Range
1.4 VP-P
Reference Voltage
+1.35 VDC
DC Offset Voltage
± 20 mV
Test Conditions unless otherwise stated: VDD = +3.3 ± 0.3 VDC; MAVDD = +3.3 ± 0.3 VDC, TA = 0°C to 70°C
Parameter
Min
DAC to Line Driver output (600Ω load, 3dB in SCF and CTF) SNR/SDR at:
4Vp-p differential
2Vp-p differential
-10dBm differential
Typ
Max
Units
dB
88/85
82/95
72/100
dB
DAC to Speaker Driver output (150Ω load, 3dB in SCF and CTF, -6dB in
speaker driver) SNR/SDR at:
2Vp-p
1Vp-p
-10dBm
88/75
82/80
72/83
80/95
Line Input to ADC (6dB in AAF) SNR/SDR at –10 dBm
Input Leakage Current (analog inputs)
-10
10
µA
Output Leakage Current (analog outputs)
-10
10
µA
102228A
Conexant
dB
3-23
CX06833-3x/4x SMXXD Modem Data Sheet
3.3
Electrical and Environmental Specifications
3.3.1
Operating Conditions, Absolute Maximum Ratings, and Power Requirements
The operating conditions are specified in Table 3-10.
The absolute maximum ratings are listed in Table 3-11.
The current and power requirements are listed in Table 3-12.
Table 3-10. Operating Conditions
Parameter
Supply Voltage
Operating Ambient Temperature
Symbol
VDD
T
A
Limits
+3.0 to +3.6
0 to +70
Units
VDC
°C
Symbol
VDD
V
IN
T
STG
V
IN
V
HZ
Limits
-0.5 to +4.0
-0.5 to (VGG +0.5)*
Units
VDC
VDC
-55 to +125
°C
-0.3 to (VAA + 0.5)
VDC
-0.5 to (VGG +0.5)*
VDC
±20
mA
±20
mA
±2500
VDC
±400
mA
Table 3-11. Absolute Maximum Ratings
Parameter
Supply Voltage
Input Voltage
Storage Temperature Range
Analog Inputs
Voltage Applied to Outputs in High
Impedance (Off) State
DC Input Clamp Current
I
DC Output Clamp Current
I
Static Discharge Voltage (25°C)
V
Latch-up Current (25°C)
I
IK
OK
ESD
TRIG
* VGG = +3.3V ± 0.3V or +5V ± 5%.
Handling CMOS Devices
The device contains circuitry to protect the inputs against damage due to high static
voltages. However, it is advised that normal precautions be taken to avoid application of
any voltage higher than maximum rated voltage.
An unterminated input can acquire unpredictable voltages through coupling with stray
capacitance and internal cross talk. Both power dissipation and device noise immunity
degrades. Therefore, all inputs should be connected to an appropriate supply voltage.
Input signals should never exceed the voltage range from -0.5V to VGG + 0.5V. This
prevents forward biasing the input protection diodes and possibly entering a latch up
mode due to high current transients.
3-24
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Table 3-12. Current and Power Requirements
Mode
Typical
Current
(Ityp)
(mA)
Maximum
Current
(Imax)
(mA)
Typical
Power
(Ptyp)
(mW)
Maximum
Power
(Pmax)
(mW)
CX06833
Normal Mode: Off-hook, normal data
58
64
191
230
connection
Normal Mode: On-hook, idle, waiting for ring
58
64
191
230
Sleep Mode
16
17.6
52.8
63.4
CX20437 VC (Optional)
Normal Mode
1.5
2
5
7
Notes:
1. Operating voltage: VDD = +3.3V ± 0.3V.
2. Test conditions: VDD = +3.3V for typical values; VDD = +3.6V for maximum values.
3. Input Ripple ≤ 0.1 Vpeak-peak.
4. f = Internal frequency.
5. Maximum current computed from Ityp: Imax = Ityp * 1.1.
6. Typical power (Ptyp) computed from Ityp: Ptyp = Ityp * 3.3V; Maximum power (Pmax) computed from
Imax: Pmax = Imax * 3.6V.
102228A
Conexant
Notes
f = 28.224 MHz
f = 28.224 MHz
f = 0 MHz
3-25
CX06833-3x/4x SMXXD Modem Data Sheet
3.4
Interface and Timing Waveforms
3.4.1
External Memory Bus Timing
The external memory bus timing is listed in Table 3-13 and illustrated in Figure 3-7.
Table 3-13. Timing - External Memory Bus
Symbol
t
t
FI
CYC
Parameter
Internal Operating Frequency
Min
28.224
Internal Operating Clock Cycle
35.43
Typ.
Max
Units
MHz
ns
Read
t
t
t
t
t
AS
ES
RW
RDS
RDH
READ# High to Address Valid
READ# High to ES Valid
READ# Pulse Width
–
11.2
–
12.2
17.72
12.5
ns
13.5
ns
124.01
ns
Read Data Valid to READ# High
6.1
–
ns
READ# High to Read Data Hold
0
–
ns
12.5
ns
Write
t
t
t
t
AS
ES
WW
WTD
t
WRITE# High to Address Valid
WRITE# High to ES Valid
WRITE# to WRITE# Pulse Width
–
11.2
–
12.2
17.72
WRITE# Low to Write Data Valid
–
WRITE# High to Write Data Hold
5.0
7.1
13.5
ns
124.01
ns
8.0
ns
–
ns
WTH
Notes:
1. ES = RAMSEL# or ROMSEL#.
2. Read pulse width and write pulse width:
RAM: t
,t
= 0.5 t
= 17.72 for Non-Extended Cycle Timing
RW WW
CYC
ROM: t
,t
= 3.5 t
= 124.01 for Extended Cycle Timing
RW WW
CYC
3. Memory speed determination:
RAM: tACCESS = t
-t
-t
= 35.43 - 13.5 - 6.3 = 15.63 ns (i.e., use 15 ns memory)
CYC ES RDS
ROM: tACCESS = 4(t
)-t
-t
= 4(35.43) - 13.5 - 6.3 = 121.92 ns (i.e., use 90 ns memory).
CYC ES RDS
4. Output Enable to Output Delay Timing:
RAM: t
=t
-t
= 0.5(t
)-t
= 17.72 - 6.3 = 11.42 ns
OE RW RDS
CYC RDS
ROM: t
=t
-t
= 3.5(t
)-t
= 124.01 - 6.3 = 117.71 ns.
OE RW RDS
CYC RDS
3-26
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Figure 3-7. Waveforms - External Memory Bus
t
CYC
C2*
t
AS
A[18:0]
t
ES
ES#**
t
RW
READ#
t
RDS
t
D[7:0]
RDH
* C2 = Internal Phase 2 clock.
** ES# = RAMSEL# or ROMSEL#.
Read Timing
t
CYC
C2*
t
AS
A[18:0]
t
ES
ES#**
t
WW
WRITE#
t
t
WTD
WTH
D[7:0]
* C2 = Internal Phase 2 clock.
** ES# = RAMSEL# or ROMSEL#.
Write Timing
102228A
Conexant
100491 F3-09 WF EB
3-27
CX06833-3x/4x SMXXD Modem Data Sheet
3.4.2
Parallel Host Bus Timing
The parallel host bus timing is listed in Table 3-14 and illustrated in Figure 3-8.
Table 3-14. Timing - Parallel Host Bus
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
AS
AH
CS
CH
RD
DD
DRH
AS
AH
CS
CH
WT
DS
Parameter
Max.
Units
READ (See Notes 1, 2, 3, 4, 5, and 6)
5
–
ns
Address Hold
10
–
ns
Chip Select Setup
0
–
ns
Chip Select Hold
10
–
ns
HRD# Strobe Width
51
–
ns
Read Data Delay
–
45
ns
Read Data Hold
10
–
ns
–
ns
Address Setup
Address Setup
Min.
WRITE (See Notes 1, 2, 3, 4, 5, and 6)
5
Address Hold
10
–
ns
Chip Select Setup
0
–
ns
Chip Select Hold
10
–
ns
HWT# Strobe Width
50
–
ns
Write Data Setup (see Note 4)
–
35
ns
t
Write Data Hold (see Note 5)
5
–
ns
DWH
Notes:
1. When the host executes consecutive Rx FIFO reads, a minimum delay of 2 times the internal CPU clock cycle
plus 15 ns (85.86 ns at 28.224 MHz) is required from the falling edge of HRD# to the falling edge of the next Host
Rx FIFO HRD# clock.
2. When the Host executes consecutive Tx FIFO writes, a minimum delay of 2 times the internal CPU clock cycle
plus 15 ns (85.86 ns at 28.224 MHz) is required from the falling edge of HWT# to the falling edge of the next Host
Tx FIFO HWT# clock.
3. t , t
=t
+ 15 ns.
RD WT CYC
4. t
is measured from the point at which both HCS# and HWT# are active.
DS
5. t
is measured from the point at which either HCS# and HWT# become inactive.
DWH
6. Clock frequency = 28.224 MHz clock.
3-28
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
Figure 3-8. Waveforms - Parallel Host Bus
HA[2-0]
tAS
tAH
HCS#
tCH
tCS
HRD#
tRD
HWT#
HD[7-0]
tDD
tDRH
a. Host Read
HA[2-0]
tAS
tAH
HCS#
tCH
tCS
HRD#
tWT
HWT#
tDWH
tDS
HD[7-0]
b. Host Write
100491 F3-10 WF-HB
102228A
Conexant
3-29
CX06833-3x/4x SMXXD Modem Data Sheet
3.4.3
Serial DTE Interface
The serial DTE interface waveforms for 4800 and 9600 bps are illustrated in Figure 3-9.
Figure 3-9. Waveforms - Serial DTE Interface
TXCLK
4800 BPS
TXD
4800 BPS
TXCLK
9600 BPS
TXD
9600 BPS
NOTE: THIS FIGURE IS VALID FOR SYNCHRONOUS MODE ONLY. THERE IS NO RELATIONSHIP BETWEEN
NOTE: TXD AND TXCLK IN ASYNCHRONOUS MODE.
a. Transmit
RXCLK
4800 BPS
RXD
4800 BPS
RXCLK
9600 BPS
RXD
9600 BPS
NOTE: THIS FIGURE IS VALID FOR SYNCHRONOUS MODE ONLY. THERE IS NO RELATIONSHIP BETWEEN
NOTE: RXD AND RXCLK IN ASYNCHRONOUS MODE.
b. Receive
3-30
Conexant
1227F3-14 WF-Ser DTE
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
3.5
Crystal Specifications
Crystal specifications are listed in Table 3-15.
Table 3-15. Crystal Specifications
Characteristic
Frequency
Calibration tolerance including effects
due to temperature and aging
Oscillation mode
Calibration mode
Load capacitance, C
L
Shunt Capacitance, C
O
Series resistance, R
1
Drive level
Operating temperature
Storage temperature
102228A
Conexant
Value
28.224 MHz nominal
±100 ppm at 25°C (C = 16.5 and 19.5 pF)
L
Fundamental
Parallel resonant
18 pF nom.
7 pF max.
35-60 Ω max. @20 nW drive level
100µW correlation; 500µW max.
0°C to 70°C
–40°C to 85°C
3-31
CX06833-3x/4x SMXXD Modem Data Sheet
This page is intentionally blank.
3-32
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
4.
Package Dimensions
The 144-pin TQFP package dimensions are shown in Figure 4-1.
The 32-pin TQFP package dimensions are shown in Figure 4-2.
Figure 4-1. Package Dimensions - 144-Pin TQFP
D
D1
D2
PIN 1
REF
D
D1
D1 D2
e
b
DETAIL A
Dim.
A
A1
D1
A2
D
D1
D2
L
A
A2
Inches*
Max.
Min.
Millimeters
Max.
Min.
1.6 MAX
0.15
0.05
1.4 REF
22.25
21.75
20.0 REF
0.0630 MAX
0.0020
0.0059
0.0551 REF
0.8563 0.8760
0.7874 REF
17.5 REF
0.6890 REF
0.0197 0.0295
L1
0.75
0.5
1.0 REF
e
0.50 BSC
0.0197 BSC
0.0394 REF
b
0.17
0.27
0.0067
0.0106
c
0.17
0.11
0.08 MAX
0.0043
0.0067
Coplanarity
0.0031 MAX
Ref: 144-PIN TQFP (GP00-D252)
c
A1
L
* Metric values (millimeters) should be used for
PCB layout. English values (inches) are
converted from metric values and may include
round-off errors.
L1
DETAIL A
PD-TQFP-144 (040395)
102228A
Conexant
4-1
CX06833-3x/4x SMXXD Modem Data Sheet
Figure 4-2. Package Dimensions - 32-Pin TQFP
D
D1
D2
PIN 1
REF
D
D1
D1 D2
b
e
DETAIL A
Dim.
A
A1
D1
A2
D
D1
A
A2
Inches*
Max.
Min.
Millimeters
Max.
Min.
1.6 MAX
0.0630 MAX
0.15
0.05
1.4 REF
0.0020
9.25
8.75
7.0 REF
0.3445
0.0059
0.0551 REF
0.3642
0.2756 REF
D2
5.6 REF
L
0.0197 0.0295
L1
0.75
0.5
1.0 REF
e
0.80 BSC
0.0315 BSC
0.2205 REF
0.0394 REF
b
0.30
0.40
0.0118
0.0157
c
0.19
0.13
0.10 MAX
0.0051
0.0075
Coplanarity
0.004 MAX
Ref: 32-PIN TQFP (GP00-D262)
c
A1
* Metric values (millimeters) should be used for
PCB layout. English values (inches) are
converted from metric values and may include
round-off errors.
L
L1
DETAIL A
PD-TQFP-32 (040395)
4-2
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
5.
Parallel Host Interface
The modem supports a 16550A interface in parallel interface versions. The 16550A
interface can operate in FIFO mode or non-FIFO mode. Non-FIFO mode is the same as
16450 interface operation. FIFO mode unique operations are identified.
5.1
Overview
The parallel interface registers and the corresponding bit assignments are shown in
Table 5-1.
The modem emulates the 16450/16550A interface and includes both a 16-byte receiver
data first-in first-out buffer (RX FIFO) and a 16-byte transmit data first-in first-out buffer
(TX FIFO). When FIFO mode is selected in the FIFO Control Register (FCR0 = 1), both
FIFOs are operative. Furthermore, when FIFO mode is selected, DMA operation of the
FIFO can also be selected (FCR3 = 1). When FIFO mode is not selected, operation is
restricted to 16450 interface operation.
The received data is read by the host from the Receiver Buffer (RX Buffer). The RX
Buffer corresponds to the Receiver Buffer Register in a 16550A device. In FIFO mode,
the RX FIFO operates transparently behind the RX Buffer. Interface operation is
described with reference to the RX Buffer in both FIFO and non-FIFO modes.
The transmit data is loaded by the host into the Transmit Buffer (TX Buffer). The TX
Buffer corresponds to the Transmit Holding Register in a 16550A device. In FIFO mode,
the TX FIFO operates transparently behind the TX Buffer. Interface operation is
described with reference to the TX Buffer in both FIFO and non-FIFO modes.
102228A
Conexant
5-1
CX06833-3x/4x SMXXD Modem Data Sheet
Table 5-1. Parallel Interface Registers
Register
Register
No.
Name
Bit No.
7
7
Scratch Register (SCR)
6
Modem Status Register (MSR) Data Carrier
Detect
(DCD)
5
Line Status Register (LSR)
4
Modem Control Register
(MCR)
3
Line Control Register (LCR)
2
Interrupt Identify Register (IIR)
(Read Only)
2
FIFO Control Register (FCR)
(Write Only)
1
Interrupt Enable Register (IER)
(DLAB = 0)
0
Transmitter Buffer Register
(DLAB = 0) (THR)
0
Receiver Buffer Register (RBR)
(DLAB = 0)
6
5
4
3
RX FIFO
Error
0
Ring
Indicator
(RI)
Data Set
Ready
(DSR)
Clear to
Send
(CTS)
1
0
Break
Transmitter Transmitter
Interrupt (BI)
Buffer
Empty
Register
(TEMT)
Empty
(THRE)
0
0
Divisor Latch Set Break
Access Bit
(DLAB)
Local
Loopback
Stick Parity Even Parity
Select (EPS)
Delta Data Delta Clear
to Send
Set Ready
(DCTS)
(DDSR)
Delta Data
Carrier
Detect
(DDCD)
Trailing
Edge of
Ring
Indicator
Framing
Error
(FE)
Parity
Error
(PE)
Overrun
Error
(OE)
Receiver
Data Ready
(DR)
Out 2
Out 1
Request to
Send
(RTS)
Data
Terminal
Ready
(DTR)
Parity
Enable
(PEN)
Word
Number of Word Length
Length
Stop Bits Select Bit 1
(WLS1) Select Bit 0
(STB)
(WLS0)
Pending
Pending
Pending
Interrupt ID Interrupt ID Interrupt ID
Bit 0
Bit 1
Bit 2
FIFOs
Enabled
FIFOs
Enabled
0
0
Receiver
Trigger MSB
Receiver
Trigger
LSB
Reserved
Reserved
DMA Mode
Select
0
0
0
0
Enable
Modem
Status
Interrupt
(EDSSI)
TX FIFO
Reset
RX FIFO
Reset
Enable
Enable
Receiver Transmitter
Holding
Line Status
Register
Interrupt
Empty
(ELSI)
Interrupt
(ETBEI)
“0" if
Interrupt
Pending
FIFO
Enable
Enable
Received
Data
Available
Interrupt
(ERBFI)
Transmitter FIFO Buffer Register (Write Only)
Receiver FIFO Buffer Register (Read Only)
1
Divisor Latch MSB Register
(DLAB = 1) (DLM)
Divisor Latch MSB
0
Divisor Latch LSB Register
(DLAB = 1) (DLL)
Divisor Latch LSB
5-2
2
Scratch Register
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
5.2
Register Signal Definitions
5.2.1
IER - Interrupt Enable Register (Addr = 1, DLAB = 0)
The IER enables five types of interrupts that can separately assert the HINT output signal
(Table 5-2). A selected interrupt can be enabled by setting the corresponding enable bit
to a 1, or disabled by setting the corresponding enable bit to a 0. Disabling an interrupt in
the IER prohibits setting the corresponding indication in the IIR and assertion of HINT.
Disabling all interrupts (resetting IER0 - IER3 to a 0) inhibits setting of any Interrupt
Identifier Register (IIR) bits and inhibits assertion of the HINT output. All other system
functions operate normally, including the setting of the Line Status Register (LSR) and
the Modem Status Register (MSR).
Bits 7-4
Not used.
Always 0.
Bit 3
Enable Modem Status Interrupt (EDSSI).
This bit, when a 1, enables assertion of the HINT output whenever the Delta
CTS (MSR0), Delta DSR (MSR1), Delta TER (MSR2), or Delta DCD (MSR3)
bit in the Modem Status Register (MSR) is a 1. This bit, when a 0, disables
assertion of HINT due to setting of any of these four MSR bits.
Bit 2
Enable Receiver Line Status Interrupt (ELSI).
This bit, when a 1, enables assertion of the HINT output whenever the Overrun
Error (LSR1), Parity Error (LSR2), Framing Error (LSR3), or Break Interrupt
(LSR4) receiver status bit in the Line Status Register (LSR) changes state. This
bit, when a 0, disables assertion of HINT due to change of the receiver LSR bits
1-4.
Bit 1
Enable Transmitter Holding Register Empty Interrupt (ETBEI).
This bit, when a 1, enables assertion of the HINT output when the Transmitter
Empty bit in the Line Status Register (LSR5) is a 1. This bit, when a 0, disables
assertion of HINT due to LSR5.
Bit 0
Enable Receiver Data Available Interrupt (ERBFI) and Character
Timeout in FIFO Mode.
This bit, when a 1, enables assertion of the HINT output when the Receiver Data
Ready bit in the Line Status Register (LSR0) is a1 or character timeout occurs in
the FIFO mode. This bit, when a 0, disables assertion of HINT due to the LSR0
or character timeout.
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Conexant
5-3
CX06833-3x/4x SMXXD Modem Data Sheet
5.2.2
FCR - FIFO Control Register (Addr = 2, Write Only)
The FCR is a write-only register used to enable FIFO mode, clear the RX FIFO and TX
FIFO, enable DMA mode, and set the RX FIFO trigger level.
Bits 7-6
RX FIFO Trigger Level.
FCR7 and FCR6 set the trigger level for the RX FIFO (Receiver Data Available)
interrupt.
FCR7
0
0
1
1
FCR6
0
1
0
1
RX FIFO Trigger Level (Bytes)
01
04
08
14
Bits 5-4
Not used.
Bit 3
DMA Mode Select.
When FIFO mode is selected (FCR0 = 1), FCR3 selects non-DMA operation
(FCR3 = 0) or DMA operation (FCR3 = 1). When FIFO mode is not selected
(FCR0 = 0), this bit is not used (the modem operates in non-DMA mode in
16450 operation).
DMA operation in FIFO mode
RXRDY will be asserted when the number of characters in the RX FIFO is
equal to or greater than the value in the RX FIFO Trigger Level (IIR0-IIR3 =
4h) or the received character timeout (IIR0-IIR3 = Ch) has occurred. RXRDY
will go inactive when there are no more characters in the RX FIFO.
TXRDY will be asserted when there are one or more empty (unfilled) locations
in the TX FIFO. TXRDY will go inactive when the TX FIFO is completely full.
Non-DMA operation in FIFO mode
RXRDY will be asserted when there are one or more characters in the RX FIFO.
RXRDY will go inactive when there are no more characters in the RX FIFO.
TXRDY will be asserted when there are no characters in the TX FIFO. TXRDY
will go inactive when the first character is loaded into the TX FIFO Buffer.
Bit 2
TX FIFO Reset.
When FCR2 is a 1, all bytes in the TX FIFO are cleared. This bit is cleared
automatically by the modem.
Bit 1
RX FIFO Reset.
When FCR1 is a 1, all bytes in the RX FIFO are cleared. This bit is cleared
automatically by the modem.
Bit 0
FIFO Enable.
When FCR0 is a 0, 16450 mode is selected and all bits are cleared in both
FIFOs. When FCR0 is a 1, FIFO mode (16550A mode) is selected and both
FIFOs are enabled. FCR0 must be a 1 when other bits in the FCR are written or
they will not be acted upon.
5-4
Conexant
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CX06833-3x/4x SMXXD Modem Data Sheet
5.2.3
IIR - Interrupt Identifier Register (Addr = 2)
The Interrupt Identifier Register (IIR) identifies the existence and type of up to five
prioritized pending interrupts. Four priority levels are set to assist interrupt processing in
the host. The four levels, in order of decreasing priority, are: Highest: Receiver Line
Status, 2: Receiver Data Available or Receiver Character Timeout, 3: TX Buffer Empty,
and 4: Modem Status.
When the IIR is accessed, the modem freezes all interrupts and indicates the highest
priority interrupt pending to the host. Any change occurring in interrupt conditions are
not indicated until this access is complete.
Bits 7-6
FIFO Mode.
These two bits copy FCR0.
Bits 5-4
Not Used.
Always 0.
Bits 3-1
Highest Priority Pending Interrupt.
These three bits identify the highest priority pending interrupt (Table 5-2). Bit 3
is applicable only when FIFO mode is selected, otherwise bit 3 is a 0.
Bit 0
Interrupt Pending.
When this bit is a 0, an interrupt is pending; IIR bits 1-3 can be used to
determine the source of the interrupt. When this bit is a1, an interrupt is not
pending.
Table 5-2. Interrupt Sources and Reset Control
Interrupt Identification Register
Interrupt Set and Reset Functions
Bit
31
Bit 2
Bit 1
Bit 0
Priority
Level
Interrupt Type
0
0
0
1
—
None
None
—
0
1
1
0
Highest
Receiver Line
Status
Overrun Error OE (LSR1),
Parity Error (PE) (LSR2),
Framing Error (FE) (LSR3),
or Break Interrupt (BI) (LSR4)
Reading the LSR
0
1
0
0
2
Received Data
Available
Received Data Available (LSR0) or
RX FIFO Trigger Level (FCR61
FCR7) Reached
Reading the RX Buffer or the RX
FIFO drops below the Trigger
Level
1
1
0
0
2
Character Time-out
1
The RX FIFO contains at least 1
character and no characters have
been removed from or input to the
RX FIFO during the last 4 character
times.
Reading the RX Buffer
Indication
Interrupt Source
Interrupt Reset Control
0
0
1
0
3
TX Buffer Empty
TX Buffer Empty
Reading the IIR or writing to the
TX Buffer
0
0
0
0
4
Modem Status
Delta CTS (DCTS) (MSR0),
Delta DSR (DDSR) (MSR1),
Trailing Edge Ring Indicator (TERI)
(MSR3), or Delta DCD (DCD)
(MSR4)
Reading the MSR
Notes:
1. FIFO Mode only.
102228A
Conexant
5-5
CX06833-3x/4x SMXXD Modem Data Sheet
5.2.4
LCR - Line Control Register (Addr = 3)
The Line Control Register (LCR) specifies the format of the asynchronous data
communications exchange.
Bit 7
Divisor Latch Access Bit (DLAB).
This bit must be set to a 1 to access the Divisor latch registers during a read or
write operation. It must be reset to a 0 to access the Receiver Buffer, the
Transmitter Buffer, or the Interrupt Enable Register.
Bit 6
Set Break.
When bit 6 is a 1, the transmit data is forced to the break condition, i.e., space
(0) is sent. When bit 6 is a 0, break is not sent. The Set Break bit acts only on
the transmit data and has no effect on the serial in logic.
Bit 5
Stick Parity.
When parity is enabled (LCR3 = 1) and stick parity is selected (LCR5 = 1), the
parity bit is transmitted and checked by the receiver as a 0 if even parity is
selected (LCR4 = 1) or as a 1 if odd parity is selected (LCR4 = 0). When stick
parity is not selected (LCR3 = 0), parity is transmit and checked as determined
by the LCR3 and LCR4 bits.
Bit 4
Even Parity Select (EPS).
When parity is enabled (LCR3 = 1) and stick parity is not selected (LCR5 = 0),
the number of 1s transmitted or checked by the receiver in the data word bits
and parity bit is either even (LCR4 = 1) or odd (LCR4 = 0).
Bit 3
Enable Parity (PEN).
When bit 3 is a 1, a parity bit is generated in the serial out (transmit) data stream
and checked in the serial in (receive) data stream as determined by the LCR 4
and LCR5 bits. The parity bit is located between the last data bit and the first
stop bit.
Bit 2
Number of Stop Bits (STB).
This bit specifies the number of stop bits in each serial out character. If bit 2 is a
0, one stop bit is generated regardless of word length. If bit 2 is a 1 and 5-bit
word length is selected, one and one-half stop bits are generated. If bit 2 is a 1
and a 6-, 7-, or 8-bit word length is selected, two stop bits are generated. The
serial in logic checks the first stop bit only, regardless of the number of stop bits
selected.
Bits 1-0
Word Length Select (WLS0 and WLS1).
These two bits specify the number of bits in each serial in or serial out character.
The encoding of bits 0 and 1 is:
Bit 1
0
0
1
1
5-6
Bit 0
0
1
0
1
Word Length
5 Bits (Not supported)
6 Bits (Not supported)
7 Bits
8 Bits
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
5.2.5
MCR - Modem Control Register (Addr = 4)
The Modem Control Register (MCR) controls the interface with the modem or data set.
Bit 7-5
Not used.
Always 0.
Bit 4
Local Loopback.
When this bit is set to a 1, the diagnostic mode is selected and the following
occurs:
1.
Data written to the Transmit Buffer is looped back to the Receiver Buffer.
2.
The DTS (MCR0), RTS (MCR1), Out1 (MCR2), and Out2 (MCR3) modem control
register bits are internally connected to the DSR (MSR5), CTS (MSR4), RI (MSR6),
and DCD (MSR7) modem status register bits, respectively.
Bit 3
Output 2.
When this bit is a 1, HINT is enabled. When this bit is a 0, HINT is in the high
impedance state.
Bit 2
Output 1.
This bit is used in local loopback (see MCR4).
Bit 1
Request to Send (RTS).
This bit controls the Request to Send (RTS) function. When this bit is a 1, RTS
is on. When this bit is a 0, RTS is off.
Bit 0
Data Terminal Ready (DTR).
This bit controls the Data Terminal Ready (DTR) function. When this bit is a 1,
DTR is on. When this bit is a 0, DTR is off.
5.2.6
LSR - Line Status Register (Addr = 5)
This 8-bit register provides status information to the host concerning data transfer.
Bit 7
RX FIFO Error.
In the 16450 mode, this bit is not used and is always 0.
In the FIFO mode, this bit is set if there are one or more characters in the RX
FIFO with a parity error, framing error, or break indication detected. This bit is
reset to a 0 when the host reads the LSR and none of the above conditions exist
in the RX FIFO.
Bit 6
Transmitter Empty (TEMT).
This bit is set to a 1 whenever the TX Buffer (THR) and equivalent of the
Transmitter Shift Register (TSR) are both empty. It is reset to a 0 whenever
either the THR or the equivalent of the TSR contains a character.
In the FIFO mode, this bit is set to a 1 when ever the TX FIFO and the
equivalent of the TSR are both empty.
102228A
Conexant
5-7
CX06833-3x/4x SMXXD Modem Data Sheet
Bit 5
Transmitter Holding Register Empty (THRE) [TX Buffer Empty].
This bit, when set, indicates that the TX Buffer is empty and the modem can
accept a new character for transmission. In addition, this bit causes the modem
to issue an interrupt to the host when the Transmit Holding Register Empty
Interrupt Enable bit (IIR1) is set to 1. The THRE bit is set to a 1 when a
character is transferred from the TX Buffer. The bit is reset to 0 when a byte is
written into the TX Buffer by the host.
In the FIFO mode, this bit is set when the TX FIFO is empty; it is cleared when
at least one byte is in the TX FIFO.
Bit 4
Break Interrupt (BI).
This bit is set to a 1 whenever the received data input is a space (logic 0) for
longer than two full word lengths plus 3 bits. The BI bit is reset when the host
reads the LSR.
Bit 3
Framing Error (FE).
This bit indicates that the received character did not have a valid stop bit. The
FE bit is set to a 1 whenever the stop bit following the last data bit or parity bit
is detected as a logic o (space). The FE bit is reset to a 0 when the host reads the
LSR.
In the FIFO mode, the error indication is associated with the particular character
in the FIFO it applies to; the FE bit is set to a 1 when this character is loaded
into the RX Buffer.
Bit 2
Parity Error (PE).
This bit indicates that the received data character in the RX Buffer does not have
the correct even or odd parity, as selected by the Even Parity Select bit (LCR4)
and the Stick Parity bit (LCR5). The PE bit is reset to a 0 when the host reads
the LSR.
In the FIFO mode, the error indication is associated with the particular character
in the it applies to; the PE bit is set to a 1 when this character is loaded into the
RX Buffer.
Bit 1
Overrun Error (OE).
This bit is set to a 1 whenever received data is loaded into the RX Buffer before
the host has read the previous data from the RX Buffer. The OE bit is reset to a
0 when the host reads the LSR.
In the FIFO mode, if data continues to fill beyond the trigger level, an overrun
condition will occur only if the RX FIFO is full and the next character has been
completely received.
Bit 0
Receiver Data Ready (DR).
This bit is set to a 1 whenever a complete incoming character has been received
and has been transferred into the RX Buffer. The DR bit is reset to a 0 when the
host reads the RX Buffer.
In the FIFO mode, the DR bit is set when the number of received data bytes in
the RX FIFO equals or exceeds the trigger level specified in FCR0-FCR1.
5-8
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
5.2.7
MSR - Modem Status Register (Addr = 6)
The Modem Status Register (MSR) reports current state and change information of the
modem. Bits 4-7 supply current state and bits 0-3 supply change information. The change
bits are set to a 1 whenever a control input from the modem changes state from the last
MSR read by the host. Bits 0-3 are reset to 0 when the host reads the MSR or upon reset.
Whenever bits 0, 1, 2, or 3 are set to a 1, a Modem Status Interrupt (IIR0-IIR3 = 0) is
generated.
Bit 7
Data Carrier Detect (DCD).
This bit indicates the logic state of the DCD# (RLSD#) output. If Loopback is
selected (MCR4 = 1), this bit reflects the state of the Out2 bit in the MCR
(MCR3).
Bit 6
Ring Indicator (RI).
This bit indicates the logic state of the RI# output. If Loopback is selected
(MCR4 = 1), this bit reflects the state of the Out1 bit in the MCR (MCR2).
Bit 5
Data Set Ready (DSR).
This bit indicates the logic state of the DSR# output. If Loopback is selected
(MCR4 = 1), this bit reflects the state of the DTR bit in the MCR (MCR0).
Bit 4
Clear to Send (CTS).
This bit indicates the logic state of the CTS# output. If Loopback is selected
(MCR4 = 1), this bit reflects the state of the RTS bit in the MCR (MCR1).
Bit 3
Delta Data Carrier Detect (DDCD).
This bit is set to a 1 when the DCD bit changes state since the MSR was last
read by the host.
Bit 2
Trailing Edge of Ring Indicator (TERI).
This bit is set to a 1 when the RI bit changes from a 1 to a 0 state since the MSR
was last read by the host.
Bit 1
Delta Data Set Ready (DDSR).
This bit is set to a 1 when the DSR bit has changed since the MSR was last read
by the host.
Bit 0
Delta Clear to Send (DCTS).
This bit is set to a 1 when the CTS bit has changed since the MSR was last read
by the host.
5.2.8
RBR - RX Buffer (Receiver Buffer Register) (Addr = 0, DLAB = 0)
The RX Buffer (RBR) is a read-only register at location 0 (with DLAB = 0). Bit 0 is the
least significant bit of the data, and is the first bit received.
5.2.9
THR - TX Buffer (Transmitter Holding Register) (Addr = 0, DLAB = 0)
The TX Buffer (THR) is a write-only register at address 0 when DLAB = 0. Bit 0 is the
least significant bit and the first bit sent.
102228A
Conexant
5-9
CX06833-3x/4x SMXXD Modem Data Sheet
5.2.10
Divisor Registers (Addr = 0 and 1, DLAB = 1)
The Divisor Latch LS (least significant byte) and Divisor Latch MS (most significant
byte) are two read-write registers at locations 0 and 1 when DLAB = 1, respectively.
The baud rate is selected by loading each divisor latch with the appropriate hex value.
Programmable values corresponding to the desired baud rate are listed in Table 5-3.
5.2.11
SCR - Scratch Register (Addr = 7)
The Scratchpad Register is a read-write register at location 7. This register is not used by
the modem and can be used by the host for temporary storage.
Table 5-3. Programmable Baud Rates
Divisor Latch (Hex)
MS
06
04
03
01
00
00
00
00
00
00
00
00
00
00
00
LS
00
17
00
80
C0
60
30
18
0C
06
04
03
02
01
00
Divisor (Decimal)
1536
1047
768
384
192
96
48
24
12
6
4
3
2
1
NA
5.3
Receiver FIFO Interrupt Operation
5.3.1
Receiver Data Available Interrupt
Baud Rate
75
110
150
300
600
1200
2400
4800
9600
19200
28800
38400
57600
115200
230400
When the FIFO mode is enabled (FCR0 = 1) and receiver interrupt (RX Data Available)
is enabled (IER0 = 1), receiver interrupt operation is as follows:
5-10
1.
The Receiver Data Available Flag (LSR0) is set as soon as a received data character
is available in the RX FIFO. LSR0 is cleared when the RX FIFO is empty.
2.
The Receiver Data Available interrupt code (IIR0-IIR4 = 4h) is set whenever the
number of received data bytes in the RX FIFO reaches the trigger level specified by
FCR6-FCR7 bits; it is cleared whenever the number of received data bytes in the RX
FIFO drops below the trigger level specified by FCR6-FCR7 bits.
3.
The HINT interrupt is asserted whenever the number of received data bytes in the
RX FIFO reaches the trigger level specified by FCR6-FCR7 bits. HINT interrupt is
de-asserted when the number of received data bytes in the RX FIFO drops below the
trigger level specified by FCR6-FCR7 bits.
Conexant
102228A
CX06833-3x/4x SMXXD Modem Data Sheet
5.3.2
Receiver Character Timeout Interrupts
When the FIFO mode is enabled (FCR0 = 1) and receiver interrupt (Receiver Data
Available) is enabled (IER0 = 1), receiver character timeout interrupt operation is as
follows:
1.
A Receiver character timeout interrupt code (IIR0-IIR3 = Ch) is set if at least one
received character is in the RX FIFO, the most recent received serial character was
longer than four continuous character times ago (if 2 stop bits are specified, the
second stop bit is included in this time period), and the most recent host read of the
RX FIFO was longer than four continuous character times ago.
5.4
Transmitter FIFO Interrupt Operation
5.4.1
Transmitter Empty Interrupt
When the FIFO mode is enabled (FCR0 = 1) and transmitter interrupt (TX Buffer Empty)
is enabled (IER0 = 1), transmitter interrupt operation is as follows:
102228A
1.
The TX Buffer Empty interrupt code (IIR0-IIR3 = 2h) will occur when the TX
Buffer is empty; it is cleared when the TX Buffer is written to (1 to 16 characters) or
the IIR is read.
2.
The TX Buffer Empty indications will be delayed 1 character time minus the last
stop bit time whenever the following occur: THRE = 1 and there have not been at
least two bytes at the same time in the TX FIFO Buffer since the last setting of
THRE was set. The first transmitter interrupt after setting FCR0 will be immediate.
Conexant
5-11
CX06833-3x/4x SMXXD Modem Data Sheet
This page is intentionally blank.
5-12
Conexant
102228A
NOTES
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