CX11252 HSFi Modem Data Sheet

CX11252 HSFi Modem Data Sheet
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CX11252 HSFi Modem
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Host-Processed
V.92/V.90/K56flex
V.92/V.90/K56flex Modem
Device Family for PCI-Bus
Desktop and Mobile
Applications
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Data Sheet (Preliminary)
Doc. No 101309C
May 17, 2001
Conexant Proprietary Information
CX11252 HSFi Modem Data Sheet
Revision Notice
Comments
Rev. C release.
Rev. B release.
Initial release.
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Date
5/17/2001
5/2/2001
12/7/2000
© 2000, 2001 Conexant Systems, Inc.
All Rights Reserved.
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Revision
C
B
A
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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.
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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
INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. CONEXANT FURTHER
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,
OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY
RESULT FROM THE USE OF THESE MATERIALS.
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Conexant products are not intended for use in medical, lifesaving or life sustaining applications. Conexant customers using or selling
Conexant products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages
resulting from such improper use or sale.
The following are trademarks of Conexant Systems, Inc.: Conexant™, the Conexant C symbol, “What’s Next in Communications
Technologies”™, K56flex™, and MNP 10EC™. Product names or services listed in this publication are for identification purposes
only, and may be trademarks of third parties. Third-party brands and names are the property of their respective owners.
For additional disclaimer information, please consult Conexant’s Legal Information posted at www.conexant.com, which is
incorporated by reference.
Reader Response: Conexant strives to produce quality documentation and welcomes your feedback. Please send comments and
suggestions to tech.pubs@conexant.com. For technical questions, contact your local Conexant sales office or field applications
engineer.
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Conexant
101309C
CX11252 HSFi Modem Data Sheet
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Contents
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Revision History ............................................................................................................................................ vi
Introduction ......................................................................................................................................... 1-1
1.1
1.2
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1.3
Overview .....................................................................................................................................................................1-1
Features ......................................................................................................................................................................1-4
1.2.1
Applications.................................................................................................................................................1-5
Technical Overview......................................................................................................................................................1-6
1.3.1
General Description .....................................................................................................................................1-6
1.3.2
Host Modem Software.................................................................................................................................1-6
1.3.3
Operating Modes .........................................................................................................................................1-6
Data/Fax Modes ...................................................................................................................................1-6
V.44 Data Compression .......................................................................................................................1-7
Synchronous Access Mode (SAM) - Video Conferencing.....................................................................1-7
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Internal Switching Circuit.....................................................................................................................1-7
TAM Mode...........................................................................................................................................1-8
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1.4
Software Speakerphone .......................................................................................................................1-8
1.3.4
Reference Design ........................................................................................................................................1-8
Hardware Signal Interfaces..........................................................................................................................................1-9
1.4.1
PCI Bus/Mini PCI Bus Host Interface ...........................................................................................................1-9
1.4.2
Serial EEPROM Interface .............................................................................................................................1-9
1.4.3
Telephone Line Interface............................................................................................................................1-10
1.4.4
Call Progress Digital Speaker Output .........................................................................................................1-10
Technical Specifications ...................................................................................................................... 2-1
Establishing Data Modem Connections .......................................................................................................................2-1
2.1.1
Dialing .........................................................................................................................................................2-1
2.1.2
Modem Handshaking Protocol ....................................................................................................................2-1
2.1.3
Call Progress Tone Detection.......................................................................................................................2-1
2.1.4
Answer Tone Detection................................................................................................................................2-1
2.1.5
Ring Detection.............................................................................................................................................2-1
2.1.6
Billing Protection .........................................................................................................................................2-1
2.1.7
Connection Speeds......................................................................................................................................2-2
2.1.8
Automode....................................................................................................................................................2-2
Data Mode...................................................................................................................................................................2-2
2.2.1
Speed Buffering (Normal Mode) ..................................................................................................................2-2
2.2.2
DTE-to-Modem Flow Control .......................................................................................................................2-2
2.2.3
Escape Sequence Detection .........................................................................................................................2-2
2.2.4
GSTN Cleardown (V.92/V.90/K56flex, V.34, V.32 bis, V.32).........................................................................2-2
2.2.5
Fall Forward/Fallback (V.92/V.90/K56flex, V.34/V.32 bis/V.32) ....................................................................2-2
2.2.6
Retrain ........................................................................................................................................................2-3
Modem-on-Hold..........................................................................................................................................................2-3
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2.1
2.2
2.3
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CX11252 HSFi Modem Data Sheet
2.4
Error Correction and Data Compression ......................................................................................................................2-3
V.44 Data Compression .......................................................................................................................2-3
V.42 Error Correction...........................................................................................................................2-4
MNP 2-4 Error Correction....................................................................................................................2-4
V.42 bis Data Compression..................................................................................................................2-4
2.9
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2.5
2.6
MNP 5 Data Compression....................................................................................................................2-4
Fax Class 1 and Fax Class 1.0 Operation......................................................................................................................2-4
Voice/TAM Mode.........................................................................................................................................................2-4
2.6.1
Online Voice Command Mode .....................................................................................................................2-5
2.6.2
Voice Receive Mode ....................................................................................................................................2-5
2.6.3
Voice Transmit Mode...................................................................................................................................2-5
Caller ID ......................................................................................................................................................................2-5
Multiple Country Support ............................................................................................................................................2-5
2.8.1
OEM Programmable Parameters..................................................................................................................2-6
2.8.2
Blacklist Parameters ....................................................................................................................................2-6
Diagnostics .................................................................................................................................................................2-6
2.9.1
Commanded Tests.......................................................................................................................................2-6
Low Power Sleep Mode...............................................................................................................................................2-6
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Conexant
101309C
CX11252 HSFi Modem Data Sheet
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Figures
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Figure 1-1. CX11252 HSFi Modem Simplified Interface ...................................................................................................1-3
Figure 1-2. CX11252 HSFi Modem Major Interfaces ........................................................................................................1-3
Figure 3-1. CX11252 Hardware Interface Signals.............................................................................................................3-2
Figure 3-2. CX11252 100-pin TQFP Pin Signals...............................................................................................................3-3
Figure 3-3. Waveforms - Serial EEPROM Interface ........................................................................................................3-13
Figure 4-1. 100-Pin TQFP Dimensions.............................................................................................................................4-1
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Tables
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Table 1-1. Modem Models and Functions ........................................................................................................................1-3
Table 3-1. CX11252 100-Pin TQFP Pin Signals................................................................................................................3-4
Table 3-2. CX11252 Pin Signal Definitions ......................................................................................................................3-5
Table 3-3. CX11252 I/O Type Definitions .........................................................................................................................3-8
Table 3-4. CX11252 DC Electrical Characteristics ............................................................................................................3-9
Table 3-5. Operating Conditions ....................................................................................................................................3-10
Table 3-6. Absolute Maximum Ratings ..........................................................................................................................3-10
Table 3-7. Current and Power Requirements .................................................................................................................3-11
Table 3-8. Timing - Serial EEPROM Interface.................................................................................................................3-12
Table 3-9. Crystal Specifications....................................................................................................................................3-14
Table 5-1. EEPROM Data Location...................................................................................................................................5-1
Table 5-2. Conexant Device ID and Subsystem Device ID Values.....................................................................................5-2
101309C
Conexant
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CX11252 HSFi Modem Data Sheet
Revision History
Changes Incorporated in Doc. No. 101309C
Figure 4-1. Replaced with correct dimension drawing.
Changes Incorporated in Doc. No. 101309B
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1.
Throughout: Deleted SmartDAA models and interface.
3.
Section 1.1: Added V.92 and V.44 introductory text.
4.
Table 1-1: Revised ordering information.
5.
Section 1.2: Added V.92, V.44, and Caller ID features, and updated system
compatibility.
6.
Section 1.3.3: Added V.92 and V.44 information.
7.
Section 2.5: Added section with modem-on-hold information.
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Section 2.4: Added V.44 information.
9.
Section 3.5, Crystal Specifications: Added.
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10. Table 3-9: Added VPCI3V and VAUX limit.
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11. Table 3-10: Added current and power requirements.
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12. Section 4: Added.
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Conexant
101309C
Introduction
1.1
Overview
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CX11252 HSFi Modem Data Sheet
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The Conexant CX11252 (HSFi) Host-Processed V.92/V.90/K56flex Modem supports
V.92 and V.90 analog data modem operation with V.44 data compression and supports
14.4 kbps fax modem operation. In addition, the modem supports remote telephone
answering machine (TAM), soft speakerphone, and PCI/Mini PCI Bus interface
operation. The modem operates with PSTN telephone lines in the U.S./Japan/Canada and
worldwide. Available models are listed Table 1-1.
The CX11252 alone supports an analog interface to an OEM-provided DAA (Figure 1-1).
This configuration supports data/fax/telephone answering machine (TAM) and software
speakerphone. Discrete input/output lines interface to off-hook relay control and ring
detection circuits. This is the lowest-cost solution for operation in the U.S./Japan
/Canada/China/South America/CTR21 (TBR21). The countries supported are defined by
the OEM-provided DAA.
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Optimized to provide the lowest-cost design in the price-sensitive modem markets, the
CX11252 is ideally suited for host-processed PCI/Mini PCI Bus-based desktop or mobile
applications such as motherboards, system boards, plug-in cards.
The CX11252 incorporates the following circuits internally to reduce the application
board bill of material (BOM) cost:
An internal voltage regulator allows operation in +5 V PCI systems without
requiring an external regulator.
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An internal power switching circuit detects and selects operation from one of
three power sources: PCI +5 V, PCI +3.3 V, or Vaux +3.3 V, which may be
available in different combinations to a modem from a PC. This allows a single
modem configuration to be used with different PCI-based PC designs.
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An internal ringwake filter eliminates the need for an external
diode/resistor/capacitor circuit.
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External pin strapping options can be used to select PCI ID from internal ROM
eliminating the need for external EEPROM.
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The CX11252 integrates all digital and analog circuits into a single VLSI (very large
scale integration) die packaged in a 100-pin thin quad flat pack (TQFP). Internal digital
circuits include PCI Bus interface logic, +5 V voltage regulator, PCI Bus power
switching, ROM, RAM, control and status registers, general purpose input/output,
internal ringwake filter, and codec interface (Figure 1-2). The analog codec circuit
includes a differential transmit analog output, a single-ended receive analog input, and an
analog modem speaker output. Modem data pump and controller functions, traditionally
implemented in dedicated hardware, are processed in a Pentium MMX-compatible PC
using host-signal processing modem software.
101309C
Conexant
1-1
CX11252 HSFi Modem Data Sheet
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In V.92/V.90/K56flex data mode, the modem can receive data at speeds up to 56 kbps
from a digitally connected V.92/V.90 or K56flex-compatible central site modem. A
V.92/V.90/K56flex modem takes advantage of the PSTN which is primarily digital
except for the client modem to central office local loop and are ideal for applications such
as remote access to an Internet Service Provider (ISP), on-line service, or corporate site.
In this mode, the modem can transmit data at speeds up to 48 kbps in V.92 or up to V.34
rates in V.90.
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Data compression (V.44/V.42 bis/MNP 5) and error correction (V.42/MNP 2-4) modes
are supported to maximize data throughput and data transfer integrity. V.44 is a more
efficient data compression than V.42 bis that significantly increases downstream
throughput thus reducing the download time for the types of files associated with Internet
use, such as Web pages and other uncompressed graphics, image, audio, and document
files. V.44 data compression can achieve compression rates of more than 25% over
V.42bis. Typical compression ratio for V.44 on Web type data is approximately 6-1
resulting in overall effective data throughput rate up to 300 kbps for a 56-kbps
connection. Non-error-correcting mode is also supported.
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All models support remote audio recording and remote audio playback over the telephone
line interface using A-Law, µ-Law, or linear coding at 8 or 7.2 kHz sample rate to
support applications such as digital telephone answering machine (TAM).
Hardware-based position independent, full-duplex speakerphone (FDSP) is optionally
supported.
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Fax Group 3 send and receive rates are supported up to 14.4 kbps with T.30 protocol.
V.80 synchronous access mode supports host-controlled communication protocols, e. g.,
H.324 video conferencing.
PCI and Mini-PCI reference design kits are available to minimize application design time
and costs.
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This data sheet describes the modem hardware capabilities. Commands and parameters
are defined in the Commands Reference Manual (Order No. 100498).
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Conexant
101309C
CX11252 HSFi Modem Data Sheet
Table 1-1. Modem Models and Functions
Application/Supported Functions
Desktop or Mobile
Application
CX11252-11
CX11252-11
Desktop
DS56-L483-021
CX11252-11
Mobile
Figure 1-1. CX11252 HSFi Modem Simplified Interface
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S ta nda rd
DAA
TIP
RIN G
TE LEP HO N E LINE
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C X 11 252
H S F M o d em
10 0-P in T Q F P
PCI Bus
V.92/V.90 Data,
V.44 Data Compression,
TAM, V.17 Fax, Software Speakerphone
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Modem
100-Pin TQFP Part No.
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Model/Order/Part Numbers
Device Set
Order Number
S o und ucer
(O ption al)
Call P rogress
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N o te: C all progress and speakerphone capablility can be im plem ented with Conexant software drivers using PC audio
hardware without the need for dedicated m odem sounducer or other audio hardware.
101 571_ 001
Figure 1-2. CX11252 HSFi Modem Major Interfaces
C onexant M odem Product
C onexant
M odem
Softw are
H o st C o m p u ter
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O EM /
C ustom er
Supplied
Softw are
C onexant M odem Hardw are
H SF i M o d em
C X112 52: 1 00-Pin T Q F P
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C ontro l an d
Status
R egiste rs
M o dem
Softwa re
D rivers
PC I Bu s
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O perating
System
Softwa re an d
M o dem
C om m unica tion
App lication
Softwa re
101309C
O EM
Supplied
H ardw are
PC I Bu s
Interface
Pow er
Sw itching
DMA
C ontro lle r
D ata and
Voice DM A
Buffers/
R AM a nd
M u ltiplexers
C ode c
an d C ode c
Interface
RXA
T X A 1, T X A 2
G P IO s
G PIO
OH#
M _ D IG _ S P K R (C all P rog ress )
ROM
M isc
Lo gic
D A A H ardw are
T elepho ne
Line In terface
D iscrete
C om pone nts
T E LEP HO N E
LIN E
T IP
R IN G
D igital Spea ker
C ircuit (O ptiona l),
e.g , Sou nducer
N o te : Call progress and speakerphone capablility can be im plem ented
with C onexant software drivers using PC audio hardware without the
need for dedicated m odem sounducer or other audio hardware.
101571_002
Conexant
1-3
CX11252 HSFi Modem Data Sheet
1.2
Features
Data modem with receive rates up to 56k bps and send rates up to 48 kbps (V.92
mode) or up to V.34 rates (V.90 mode)
− V.92, V.90, K56flex, V.34, V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21; Bell
212A and Bell 103 modulation modes
− Quick connect
− Modem-on-hold
− V.250 and V.251 commands
Data compression and error correction
− V.44 data compression for optimal downloading of Internet Web pages and files
− V.42 bis and MNP 5 data compression
− V.42 LAPM and MNP 2-4 error correction
Fax modem with 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 commands
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, or V.32
Telephony/remote TAM
− V.253 commands
− 8-bit µ-Law/A-Law coding (G.711)
− 8-bit/16-bit linear coding
− 8 kHz sample rate
− Concurrent DTMF detect, ring detect and caller ID detect
V.80 synchronous access mode supports host-controlled communication protocols
with H.324 interface support
V.8/V.8bis and V.251 commands
Data/Fax call discrimination
Internal circuits eliminate external components
− EEPROM
− +5 V to +3.3V voltage regulator
− PCI +5V, PCI +3.3V, and Vaux +3.3V power switching circuit
− Ringwake eliminating external diode/resistor/capacitor circuit
Worldwide operation including U.S./Japan/Canada
− Complies to requirements of TBR21 and all other countries
− Caller ID detection
− Call progress, blacklisting
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Conexant
101309C
CX11252 HSFi Modem Data Sheet
Single configuration profile stored in host
Modem and audio paths concurrent across PCI Bus
System compatibility
− Windows 95/98 operating system on an MMX 200 MHz-based computer with
32 MB RAM, or equivalent
− Windows 98SE/ME/2000 operating system on a MMX 200 MHz-based
computer with 64 MB RAM, or equivalent
− Microsoft's PC 2001 Design Initiative compliant
− Unimodem/V compliant
− Linux Kernel 2.2.16, 2.2.17, and 2.4
Operates from +5 V PCI, +3.3 V PCI, or +3.3 V Vaux
− Automatic PCI +5 V, PCI +3.3 V, or Vaux internal power switching
− +5 V operation or +3.3 V operation with +5 V tolerant digital inputs
+3.3 V analog operation
32-bit PCI Local Bus interface
− Compliant with PCI Local Bus Specification Rev. 2.2 and Mini PCI
Specification Draft 1.0.
− PCI Bus Mastering interface
− 33 MHz PCI clock support
− Meets PCI Bus Power Management Spec. Rev. 1.1
− ACPI Power Management Registers
− APM support
− PME# support
CX11252 packaged in small 100-pin TQFP
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Applications
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1.2.1
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PCI plug-in cards
Embedded PC motherboards
System boards
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1-5
CX11252 HSFi Modem Data Sheet
Technical Overview
1.3.1
General Description
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The CX11252 provides the processing core for a complete modem system design
featuring data/fax/remote TAM modem. Modem operation, including dialing, call
progress, telephone line interface, and host interface functions, are supported and
controlled through the command set.
Modem operation, including dialing, call progress, telephone line interface, telephone
handset interface, voice/speakerphone interface, and host interface functions are
supported and controlled through the V.250, V.251, and V.253-compatible command set.
1.3.2
Host Modem Software
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The modem hardware connects to the host processor via a PCI or Mini PCI interface. The
OEM adds a crystal circuit and standard DAA circuit to complete the system.
The host modem software performs the following tasks:
General modem control, which includes command sets, fax Class 1 and 1.0, remote
TAM, voice/speakerphone, error correction, data compression, and operating system
interface functions.
2.
Modem data pump signal processing, which includes data and facsimile modulation
and demodulation, as well as voice sample formatting.
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1.
1.3.3
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Modem software is provided to support modem models listed in Table 1-1 (see Software
Release Notices).
Operating Modes
Data/Fax Modes
V.92 data modem mode, the modem supports the following:
Receive data from a digital source supporting V.92 over the digital telephone
network portion of the PSTN at line speeds up to 56 kbps.
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PCM upstream which transmits data at line speeds from 24 kbps up to 48 kbps in
increments of 1.33 kbps.
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Quick connect which allows quicker subsequent connection to a V.92 server using
stored line parameters obtained during the initial connection.
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Modem-on-hold which 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 server pre-defined amount of time of holding the data connection for a
brief conversation. The data connection resumes upon termination of the incoming
call.
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V.92 mode can fallback to V.90 mode.
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In V.90/K56flex data modem mode, the modem can receive data from a digital source
using a V.90- or K56flex-compatible central site modem over the digital telephone
network portion of the PSTN at line speeds up to 56 kbps. Asymmetrical data
1-6
Conexant
101309C
CX11252 HSFi Modem Data Sheet
transmission supports sending data at line speeds up to V.34 rates. This mode can
fallback to full-duplex V.34 mode, and to slower rates as dictated by line conditions.
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In V.34 data modem mode, the modem can operate in 2-wire, full-duplex, asynchronous
modes at line rates up to 33.6 kbps. Data modem modes perform complete handshake and
data rate negotiations. Using V.34 modulation to optimize modem configuration for line
conditions, the modem can connect at the highest data rate that the channel can support
from 33600 bps down to 2400 bps with automatic fallback. 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 standard are
supported.
V.44 Data Compression
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In fax modem mode, the modem can operate in 2-wire, 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 fax EIA/TIA-578 Class 1 or T.31 Class 1.0
command interface. Full HDLC formatting, zero insertion/deletion, and CRC
generation/checking are provided.
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V.44 provides efficient data compression that decreases the download time for the types
of files associated with Internet use. This significant 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.)
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.
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Voice-call-first (VCF) before switching to a videophone call is also supported.
Internal Switching Circuit
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An internal power switching circuit detects and selects operation from one of three power
sources: PCI +5 V, PCI +3.3 V, or Vaux +3.3 V, which may be available in different
combinations to a modem from a PC in the retail and OEM markets. The combinations
supported are:
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PCI +3.3 V
0
0
0
0
1
1
1
1
101309C
PCI +5 V
0
0
1
1
0
0
1
1
Vaux +3.3 V
0
1
0
1
0
1
0
1
Conexant
Device Power Source
0
Vaux +3.3V
PCI +5V
PCI +5V in D0 or Vaux +3.3V in D3cold
PCI +3.3V
PCI +3.3V in D0 or Vaux +3.3V in D3cold
PCI +3.3V
PCI +3.3V in D0 or Vaux +3.3V in D3cold
1-7
CX11252 HSFi Modem Data Sheet
TAM Mode
TAM Mode is supported by three submodes:
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TAM Mode features include 8-bit µ-Law, A-Law, and linear coding at 8 kHz sample rate.
Tone detection/generation, call discrimination, and concurrent DTMF detection are also
supported. This mode supports applications such as digital TAM, voice annotation, and
recording from and playback to the telephone line. ADPCM (4-bit IMA) coding is also
supported to meet Microsoft WHQL logo requirements.
Online Voice Command Mode supports connection to the telephone line or a
microphone/speaker.
2.
Voice Receive Mode supports recording voice or audio data input, typically from the
telephone line or a microphone.
3.
Voice Transmit Mode supports playback of voice or audio data output, typically to
the telephone line or a speaker.
Software Speakerphone
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1.3.4
Reference Design
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Software speakerphone may be accomplished through the system audio using audio
drivers without the addition of dedicated microphone and speaker circuitry to reduce
component cost.
PCI and Mini PCI Type IIIB reference designs are available to minimize application
design time and costs.
These boards are pretested to pass FCC Part 15B, and Part 68 for immediate
manufacturing.
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A design package for each board is available in electronic form. The design package
includes schematics, bill of materials (BOM), vendor parts list (VPL), board layout files
in Gerber format, and complete documentation.
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The designs can also be used for the basis of a custom designs by the OEM to accelerate
design completion for rapid market entry.
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Conexant
101309C
CX11252 HSFi Modem Data Sheet
Hardware Signal Interfaces
1.4.1
PCI Bus/Mini PCI Bus Host Interface
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1.4
The PCI/Mini PCI interface connects directly to an embedded or external PCI/Mini PCI
interface eliminating the need for additional external logic components.
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The Bus Interface conforms to the PCI/Mini PCI Local Bus Specification, Production
Version, Revision 2.2, December 18, 1998 and Mini PCI Specification Draft 1.0. It is a
memory slave (burst transactions) and a bus master for PC host memory accesses (burst
transactions). Configuration is by PCI configuration protocol.
The following interface signals are supported:
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Address and data
− 32 bidirectional Address/Data (AD[31-0]; bidirectional
− Four Bus Command and Byte Enable (CBE [3:0]), bidirectional
− Bidirectional Parity (PAR); bidirectional
Interface control
− Cycle Frame (FRAME#); bidirectional
− Initiator Ready (IRDY#); bidirectional
− Target Ready (TRDY#); bidirectional
− Stop (STOP#); bidirectional
− Initialization Device Select (IDSEL); input
− Device Select (DEVSEL#); bidirectional
Arbitration
− Request (REQ#); output
− Grant (GRANT#); input
Error reporting
− Parity Error (PERR#); bidirectional
− System Error ; bidirectional
System
− Interrupt A (INTA#); output
− Clock (PCICLK); input
− Reset (PCIRST#); input
− Clock Running (CLKRUN#); input
Power Management
− Power Management Event (PME#), output
− Vaux Detect (VauxDET), input
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1.4.2
Serial EEPROM Interface
A serial EEPROM may be used to store the Maximum Latency, Minimum Grant, Device
ID, Vendor ID, Subsystem ID, and Subsystem Vendor ID parameters for the PCI
Configuration Space Header. Contact an FAE the local Conexant sales office to
determine if the EEPROM is required.
101309C
Conexant
1-9
CX11252 HSFi Modem Data Sheet
The serial EEPROM interface optionally connects to a Microchip 93LC66B (256 x 16),
93LC56B (128 x 16), Atmel AT93C66 (256 x 16), AT93C56 (128 x 16), or equivalent
serial EEPROM. Its size can be reduced from the total of 4096 (256 x 16) bits down to
2048 (128 x 16) bits in non-PC card applications.
1.4.3
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The EEPROM is programmable by the PC via the PCI Bus interface (see Section 4).
Telephone Line Interface
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The CX11252 codec connects to the telephone line through a standard discrete DAA.
The following DAA interface signals are supported:
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•
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1.4.4
A single-ended Receive Analog input (RXA) and a differential Transmit Analog
output (TXA1 and TXA2) to the telephone line.
An Off-hook (OH#) relay control output for connecting the modem to the telephone
line.
A Ring Indicate (IRING#) input for sensing a raw incoming ring signal.
General purpose inputs/outputs (GPIOs)
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Call Progress Digital Speaker Output
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A digital speaker output (DSPKOUT) is provided which can be directed to a low-cost
OEM-supplied speaker circuit for call progress in Data/Fax mode. Alternatively, call
progress may be accomplished through the system audio using modem audio drivers in
order to reduce component cost, in which case the digital speaker circuitry would not be
needed.
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Conexant
101309C
Technical Specifications
2.1
Establishing Data Modem Connections
2.1.1
Dialing
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2
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CX11252 HSFi Modem Data Sheet
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.
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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.
2.1.2
Modem Handshaking Protocol
2.1.3
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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.
Call Progress Tone Detection
2.1.4
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Ringback, equipment busy, and progress tones can be detected in accordance with the
applicable standard represented by the country profile currently in affect.
Answer Tone Detection
2.1.5
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Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T modes
and 2225 ± 40 Hz in Bell modes.
Ring Detection
A ring signal can be detected from a TTL-compatible square wave input (frequency is
country-dependent).
Billing Protection
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2.1.6
When the modem goes off-hook to answer an incoming call, both transmission and
reception of data are prevented for a period of time determined by country requirement to
allow transmission of the billing signal.
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2-1
CX11252 HSFi Modem Data Sheet
2.1.7
Connection Speeds
2.1.8
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Data modem line speed can be selected using the +MS command in accordance with
V.250. The +MS command selects modulation, enables/disables automode, and selects
transmit and receive minimum and maximum line speeds.
Automode
2.2
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Automode detection can be enabled by the +MS command to allow the modem to
connect to a remote modem in accordance with V.250.
Data Mode
2.2.1
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Data mode exists when a telephone line connection has been established between
modems and all handshaking has been completed.
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.
DTE-to-Modem Flow Control
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2.2.2
If the modem-to-line speed is less than the DTE-to-modem speed, the modem supports
XOFF/XON or RTS/CTS flow control with the DTE to ensure data integrity.
Escape Sequence Detection
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2.2.3
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.
2.2.4
GSTN Cleardown (V.92/V.90/K56flex, V.34, V.32 bis, V.32)
2.2.5
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Upon receiving GSTN Cleardown from the remote modem in a non-error correcting
mode, the modem cleanly terminates the call.
Fall Forward/Fallback (V.92/V.90/K56flex, V.34/V.32 bis/V.32)
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During the initial handshake, the modem will connect at the appropriate speed to provide
optimal modem throughput within V.92/V.90/K56flex/V.34/V.32 bis/V.32 mode
depending upon signal quality and line conditions.
When connected in V.92/V.90/K56flex/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.
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Conexant
101309C
CX11252 HSFi Modem Data Sheet
2.2.6
Retrain
Modem-on-Hold
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2.3
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The modem may lose synchronization with the received line signal under poor line
conditions. If this occurs, retrain is initiated to attempt recovery depending on the type of
connection. Under such line conditions, retrain is also initiated after three consecutive
renegotiations when the modem receives errors and retransmits data. If 30 seconds of
retrain elapse without the modem connecting, the call will be terminated.
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 V.92 server and can be
executed through two methods.
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One method is to enable MOH through the +PMH command. With Call Waiting
Detection (+PCW command) enabled, an incoming call can be detected while on-line.
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.
2.4
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An alternative method is to use communications software that makes use of the Conexant
modem-on-hold drivers. Using this method, the software can detect an incoming call,
place the data connection on hold, and switch back to a data connection.
Error Correction and Data Compression
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V.44 Data Compression
V.44 data compression encodes pages and files associated with Web pages more
efficiently than V.42 bis. 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.
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V.44 data compression is controlled by the +DS44 extended-format compound parameter
which accepts the following subparameters:
Direction: Specifies the desired direction(s) of operation of the data compression
function (from the DTE point of view).
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Compression_negotiation: Specifies whether or not the modem should continue to
operate if the desired result is not obtained.
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•
Capability: Specifies the use of stream method, packet method, or multi-packet
method.
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Max_codewords_tx: Specifies the maximum number of codewords which should be
negotiated in the transmit direction.
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Max_codewords_rx: Specifies the maximum number of codewords which should be
negotiated in the receive direction.
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Max_string_tx: Specifies the maximum string length to be negotiated in the transmit
direction.
Conexant
2-3
CX11252 HSFi Modem Data Sheet
Max_string_rx: Specifies the maximum string length to be negotiated in the receive
direction.
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Max_history_tx: Specifies the maximum size of the history buffer to be negotiated in
the transmit direction.
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Max_history_rx: Specifies the maximum size of the history buffer to be negotiated in
the receive direction.
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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.
MNP 2-4 Error Correction
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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.
V.42 bis Data Compression
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V.42 bis data compression mode operates when a LAPM or MNP 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 dictionaries,
dynamically updated during normal operation, are used to store the strings.
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MNP 5 Data Compression
MNP 5 data compression mode 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.
Fax Class 1 and Fax Class 1.0 Operation
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2.5
Facsimile functions operate in response to Fax Class 1 commands when +FCLASS=1 or
to Fax Class 1.0 commands when +FCLASS=1.0.
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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.
2.6
Voice/TAM Mode
Voice and audio functions are supported by the Voice Mode. Voice Mode includes three
submodes: Online Voice Command Mode, Voice Receive Mode, and Voice Transmit
Mode.
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Conexant
101309C
CX11252 HSFi Modem Data Sheet
2.6.1
Online Voice Command Mode
2.6.2
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This mode results from the connection to the telephone line or a voice/audio I/O device
(e.g., microphone or speaker) through the use of the +FCLASS=8 and +VLS commands.
After mode entry, AT commands can be entered without aborting the connection.
Voice Receive Mode
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This mode is entered when the +VRX command is active in order to record from the
telephone line.
Received analog voice samples are converted to digital form and compressed for reading
by the host. AT commands control the codec sample rate.
2.6.3
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Received analog mono audio samples are converted to digital form and formatted into 8bit µ-Law, A Law, or linear format for reading by the host. AT commands control the bit
length and sampling rate. Concurrent DTMF/tone detection is available.
Voice Transmit Mode
2.7
Caller ID
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This mode is entered when the +VTX command is active in order to playback voice to
the telephone line. Concurrent DTMF/tone detection is available. Digitized audio data is
converted to analog form.
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Both Type I Caller ID (On-Hook Caller ID) and Type II Caller ID (Call Waiting Caller
ID) are supported. 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.
2.8
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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.
Multiple Country Support
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Modem operation supports all countries. The following capabilities are provided in
addition to the data modem functions previously described. Country dependent
parameters are included in the .INF file for customization by the OEM Programmable
Parameters.
The OEM supplies the DAA. Country support depends on the OEM-supplied DAA.
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Conexant
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CX11252 HSFi Modem Data Sheet
2.8.1
OEM Programmable Parameters
The following country-dependent parameters are programmable:
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2.8.2
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Dial tone detection levels and frequency ranges.
DTMF dialing transmit output level, DTMF signal duration, and DTMF interdigit
interval parameters.
Pulse dialing parameters such as make/break times, set/clear times, and dial codes.
Ring detection frequency range.
Blind dialing disable/enable.
The maximum, minimum, and default carrier transmit level values.
Calling tone, generated in accordance with V.25, may also be disabled.
Call progress frequency and tone cadence for busy, ringback, congested, dial tone 1,
and dial tone 2.
Answer tone detection period.
On-hook/off-hook, make/break, and set/clear relay control parameters.
Blacklist Parameters
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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").
Up to 20 such numbers may be tabulated. The blacklist parameters are programmable.
The current blacklisted and delayed numbers can be queried via AT*B and AT*D
commands, respectively.
Diagnostics
2.9.1
Commanded Tests
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2.9
Diagnostics are performed in response to the &T1 command per V.54:
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Analog Loopback (&T1 Command). Data from the local DTE is sent to the
modem, which loops the data back to the local DTE.
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Diagnostic testing with the Conexant ModemXpert Modem Diagnostic Program is
supported.
2.10
Low Power Sleep Mode
When not being used, the modem assumes low power (D3) state.
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Conexant
101309C
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