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EMBEDDED MODEM DEVELOPMENT KIT USER’S GUIDE

1. Kit Contents

The Embedded Modem Development Kit contains the following items:

“ C8051F120 Target Board

* AB3 Modem Adapter Board

* Si2457FT18-EVB Modem Board

* Silicon Laboratories Evaluation Kit IDE and Product Information CD-ROM. CD content includes the following:
* Silicon Laboratories Integrated Development Environment (IDE)
* Keil Software 8051 Development Tools (evaluation assembler, linker and 'C' compiler)
* Source code examples and register definition files
* Documentation
* TCP/IP Configuration Wizard
* Embedded Modem Development Kit User's Guide (this document)

* AC to DC Power Adapter

* USB Debug Adapter (USB to Debug Interface)

* USB Cable

2. Kit Overview

This Embedded Modem Development kit provides a means to develop real-world embedded modem applications
based on the CMX Micronet™ protocol stack running on Silicon Laboratories MCU devices. See application note
"AN237: TCP/IP Library Programmer's Guide" for detailed information about the TCP/IP stack. The kit includes
three development boards along with the Silicon Laboratories TCP/IP Configuration Wizard and Integrated
Development Environment (IDE) to expedite embedded modem designs. Section 3 takes the designer through an
example illustrating each of the steps to create an application using the included software.

A C8051F120 Target Board, an AB3 Modem Adapter board, and a Si2457FT18-EVB Modem Board are included in
the Embedded Modem Development kit. These boards are shown in Figure 1. The C8051F120 Target Board is a
Silicon Laboratories standard development board featuring the 100 MIPs, 8051-based C8051F120 MCU. The AB3
Modem Adaptor Board connects the C8051F120 board to the Si2457 modem chipset board, the Si2457FT18-EVB.

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Figure 1. Embedded Modem Development Kit Hardware Overview

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3. Development Kit Embedded Modem Demonstration

The example detailed below describes the steps necessary to run a simple demonstration. This example steps
through hardware setup and code configuration using the TCP/IP Configuration Wizard and the Silicon
Laboratories IDE to create and debug an example ping application.

3.1. Hardware Setup

Connect the hardware included with the kit according to the instructions listed below. Diagrams of the hardware
setup are shown in Figure 2 and Figure 3.

1. Connect the Si2457FT18-EVB Modem Board to the AB3 Modem Adapter Board at JP1 and JP2.
2. Connect the AB3 Modem Adapter Board to the C8051F120 Target Board at J24.

3. Using the ribbon cable, connect the USB Debug Adapter to the C8051F120 Target Board at the JTAG
header.

4. Connect one end of the provided USB cable to any available USB port on the PC.
Connect the other end of the USB cable into the USB connector on the USB Debug Adapter.

6. Connect the ac/dc Power Adapter to the C8051F120 Target Board at P1. This connection should power
the boards. Power is indicated by the "PWR" LED.

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Figure 2. Embedded Modem Demo Board Connections

AB3 Modem Adapter Board

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USB Port

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Figure 3. Embedded Modem Demo Debug Connections

3.2. Phone Line Hardware Setup
Connect the phone lines and modems according to the instructions listed below. A diagram of the phone line setup
is shown in Figure 4.

1. Connect a phone cable from the target PC and modem to a phone line simulator or a phone line outlet.

2. Connect a phone cable from the AB3 Modem Adapter Board at the RJ11 connector to the phone line
simulator or a phone line outlet.

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Phone Line
Outlets Modem

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Modem
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Figure 4. Embedded Modem Demo Phone Line Connections

3.3. Software Installation
Install the software included with the Embedded Modem Development kit according to the instructions below.

1.
2.
3.

G >

Place the Embedded Modem Development Kit CD-ROM into the PC for application install.
An installation dialogue box will appear. Click the Install Development Tools button.

Follow the installation prompts to install the development tools. The Silicon Laboratories IDE will be
installed by default in the “C:\SiLabs\MCU” directory, the Embedded Modem examples will be installed by
default in the “C:\SiLabs\MCU\Examples\Modem’ directory, and the TCP/IP Configuration Wizard will be
installed by default in the “C:\SiLabs\MCU\TCP-IP Config" directory. In addition, shortcuts to the applica-
tions will be placed in the Start Programs menu.

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3.4. Configuring PC Modem Settings

The target PC and modem must be configured to receive communications from the Si2457 in the Embedded
Modem Development Kit. Follow the steps below to configure the PC.

1.

2
3.
4

о

9.

Open the Network Connections window. Links сап be found in the Start menu or the Control Panel.
Select Create a New Connection from the File menu in the Network Connections window.
The New Connection Wizard will open. Click the Next button.

Select the Set up an advanced connection option. Click the Next button. (This window might appear with
all operating systems.)

Select the Accept incoming connections option. Click the Next button.

The next window should show all of the available devices on the PC. Check the modem that will be used
for the demo.

The Incoming Virtual Private Network (VPN) Connection window does not require any selections. Click
the Next button.

Check the User that will be allowed to connect. Take note of the User name and Password that are
required for this connection. These will be needed in Section 3.6 (Step 6). Click the Next button.

Check the Internet Protocol (TCP/IP) option. Click the Next button.

10. Click the Finish button.

3.5. Creating Initialization Firmware with the TCP/IP Configuration Wizard

The next step is to create TCP/IP initialization firmware for the C8051F 120 device. This is done using the TCP/IP
Configuration Wizard included with the Embedded Modem Development Kit.

1.

9.

To run the program, select TCP/IP Configuration Wizard from the Start Silicon Laboratories menu or
run TCPIP Config.exe located by default in the “C:\SiLabs\MCU\TCP-IP Config" directory.

In the Hardware Settings section in the left window, check Si245x.
In the Settings section in the right window, select your country from the Country Codes list.

In the Settings section in the right window, enter the phone number of the target modem in the Outgoing
phone number text box.

In the Protocol Settings Link/Physical Layer section in the left window, check PPP and PAP. No PPP
or PAP setting changes are required for this demonstration.

In the Protocol Settings Transport Layer section іп the left window, check UDP.
Next, to create the firmware and project select Generate Project from the File menu.

When prompted for a folder to save the project, browse to the “C:\SiLabs\MCU\Examples\Modem\Demo”
directory. Click the OK button.

Click the OK button when the the "Project generated successfully" message appears.

10. Close the TCP/IP Configuration Wizard.

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3.6. Configuring the Firmware with the IDE

The next step is to customize the firmware created by the TCP/IP Configuration Wizard. This is done using the
Silicon Laboratories IDE included with the Embedded Modem Development Kit.

1. То run the IDE, select Silicon Laboratories IDE from the StartoSilicon Laboratories menu or run
IDE.exe located by default іп the “C:\SiLabs\MCU” directory.

2. Select Project Open Project to open the Open Workspace window. Browse to the project file created іп
Section 3.5 located in the “C:\SiLabs\MCU\Examples\Modem\Demo’ directory. Select TCP/P_Project.wsp,
and click the Open button.

3. Next, the file containing the Demo function must be added to the project. Right click on the Source Files
file group in the Project Workspace window, and select Add file to group Source Files. Browse to the
“C:\SiLabs\MCU\Examples\Modem\Demo’ directory. Select demo.c and click the Open button.

4. Inthe Project Workspace window, right click on demo.c, and select Add demo.c to build.

Next, the main () function needs to be edited to call the function in demo.c. Open main.c and add
DEMO () ; to the line above the final while (1); statement. After making the edit, Save and close main.c.
The main function is listed below.

void main (void) {

PSOCKET INFO socket ptr;

// Disable watchdog timer
WDTCN = Oxde;
WDTCN = Oxad;

// Initialize the MCU
PORT Init ();
SYSCLK Init();

// Initialize the TCP/IP stack

if (mn init() « 0)

(
// If code execution enters this while(1) loop, the stack failed to initialize.
// Verify that all boards are connected and powered properly.
while(1);

)

DEMO ();

while(1);

6. Next, the DEMO () function needs to be edited to include the correct connection information for the target
modem. Open demo.c and edit the following lines using the User name and Password from Section 3.4,

Step 8.
char pap user[] - "user";
char pap pwd[] = "password";

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3.7. Running the Embedded Modem Demo

Once all the changes have been made to the firmware, the project must be built, downloaded to the C8051F120
device, and then run. Follow the instructions below to perform these steps.

1.

тов oN

Build the project by clicking on the Build/Make Project button in the toolbar or selecting Project
Build/Make Project from the menu.

Click the Connect button іп the toolbar or select Debug Connect from the menu to connect to the device.
Download the project to the target by clicking the Download Code button in the toolbar.
Run the demo by clicking the Go button in the toolbar or selecting Debug Go from the menu.

To test the connection, the IP Address assigned to the Embedded Modem kit must be retrieved.
a. Open the Network Connections window from the Control Panel.

b. Wait for the connection to be established. When the connection is complete a Network status icon will appear in
the system tray. Additionally, the connection, titled with the User name, will appear in the Network Connections
window.

c. Double click on the User name connection to open the Connection Status window.
d. Select the Details tab and take note of the Client IP Address shown.

Open a Windows Command Prompt window to perform a ping test to verify that the $12457 modem was
successfully able to connect to the target modem

Using the IP Address from step 5, type the following in the Command Prompt window: ping /P Address

If the communication was successful “Reply” messages will appear. If the communication was NOT suc-
cessful "Request Timed Out” messages will appear.

3.8. Troubleshooting

If the modems are unable to establish a connection, verify the following:

1.

The pap user апа pap риа variables in demo.c correspond to the User name and Password of one ої
the users who is allowed to connect to the incoming connection.

It is possible that there is no DHCP server to allocate an IP address. From the Network Connections win-
dow, open up the connection and go to the Networking tab. Highlight Internet Protocol (TCP/IP) and
click the Properties button. Under "TCP/IP address assignment," select "Specifiy TCP/IP addresses" and
specify a range of IP addresses that is valid on your network in the "From:" and "То:" dialog boxes.

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4. Software Setup

The included CD-ROM contains the Silicon Laboratories IDE, Keil software 8051 tools, and additional
documentation. Insert the CD-ROM into your PC’s CD-ROM drive. An installer will automatically launch, allowing
you to install the IDE software or read documentation by clicking buttons on the Installation Panel. If the installer
does not automatically start when you insert the CD-ROM, run autorun.exe found in the root directory of the CD-
ROM. Refer to the readme.txt file on the CD-ROM for the latest information regarding known IDE problems and
restrictions.

5. Silicon Laboratories IDE (Integrated Development Environment)

The Silicon Laboratories IDE integrates a source-code editor, source-level debugger and in-system Flash
programmer. The use of third-party compilers and assemblers is also supported. This development kit includes the
Keil Software А51 macro assembler, BL51 linker and evaluation version C51 "С" compiler. These tools can be used
from within the Silicon Laboratories IDE.

5.1. System Requirements
The Silicon Laboratories IDE requirements:

* Pentium-class host PC running Microsoft Windows 95 or later, or Microsoft Windows NT or later.
* One available USB port.
* 64 MB RAM and 40 MB free HD space recommended.

5.2. Assembler and Linker

A full-version Keil A51 macro assembler and BL51 banking linker are included with the development kit and are
installed during IDE installation. The complete assembler and linker reference manual can be found on-line under
the Help menu in the IDE or in the “SiLabs\MCU\hIp” directory (A51.pdf).

5.3. Evaluation C51 'C' Compiler

An evaluation version of the Keil C51 'C' compiler is included with the development kit and is installed during IDE
installation. The evaluation version of the C51 compiler is the same as the full professional version except code
size is limited to 4 kB and the floating point library is not included. Additionally, support is included for importing
TCP/IP Library object code. The C51 compiler reference manual can be found under the Help menu in the IDE or
in the “SiLabs\MCU\hIp” directory (C51.pdf).

5.4. Using the Keil Software 8051 Tools with the Silicon Laboratories IDE

To perform source-level debugging with the IDE, you must configure the Keil 8051 tools to generate an absolute
object file in the OMF-51 format with object extensions and debug records enabled. You may build the OMF-51
absolute object file by calling the Keil 8051 tools at the command line (e.g., batch file or make file) or by using the
project manager built into the IDE. The default configuration when using the Silicon Laboratories IDE project
manager enables object extension and debug record generation. Refer to application note “AN104: Integrating Keil
8051 Tools Into the Silicon Labs IDE" in the “SiLabs\MCU\Documentation\Appnotes” directory on the CD-ROM for
additional information on using the Keil 8051 tools with the Silicon Laboratories IDE.

To build an absolute object file using the Silicon Laboratories IDE project manager, you must first create a project.
A project consists of a set of files, IDE configuration, debug views, and a target build configuration (list of files and
tool configurations used as input to the assembler, compiler, and linker when building an output object file).

The following sections illustrate the steps necessary to manually create a project with one or more source files,
build a program and download the program to the target in preparation for debugging. (The IDE will automatically
create a single-file project using the currently open and active source file if you select Build/Make Project before a
project is defined.)

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5.4.1. Creating a New Project

1.
2.

Select Project New Project to open a new project and reset all configuration settings to default.

Select File New File to open an editor window. Create your source file(s) and save the file(s) with a rec-
ognized extension, such as .c, .h, or .asm, to enable color syntax highlighting.

Right-click on “New Project” in the Project Window. Select Add files to project. Select files in the file
browser and click Open. Continue adding files until all project files have been added.

For each of the files in the Project Window that you want assembled, compiled, and linked into the target
build, right-click on the file name and select Add file to build. Each file will be assembled or compiled as
appropriate (based on file extension) and linked into the build of the absolute object file.

Note: If a project contains a large number of files, the "Group" feature of the IDE can be used to organize.
Right-click on “New Project’ in the Project Window. Select Add Groups to project. Add pre-defined
groups or add customized groups. Right-click on the group name and choose Add file to group. Select files
to be added. Continue adding files until all project files have been added.

5.4.2. Building and Downloading the Program for Debugging

1.

Once all source files have been added to the target build, build the project by clicking on the Build/Make
Project button in the toolbar or selecting Project Build/Make Project from the menu.

Note: After the project has been built the first time, the Build/Make Project command will only build the
files that have been changed since the previous build. To rebuild all files and project dependencies, click
on the Rebuild АП button in the toolbar or select Project Rebuild All from the menu.

Before connecting to the target device, several connection options may need to be set. Open the
Connection Options window by selecting Options Connection Options... in the IDE menu. First, select
the appropriate adapter in the "Serial Adapter" section. Next, the correct "Debug Interface" must be selected.
C8051F 12x family devices use the JTAG debug interface. Once all the selections are made, click the OK
button to close the window.

Click the Connect button іп the toolbar or select Debug Connect from the menu to connect to the device.
Download the project to the target by clicking the Download Code button in the toolbar.

Note: To enable automatic downloading if the program build is successful select Enable automatic con-
nect/download after build in the Project Target Build Configuration dialog. If errors occur during the
build process, the IDE will not attempt the download.

Save the project when finished with the debug session to preserve the current target build configuration,
editor settings and the location of all open debug views. To save the project, select Project Save Project
As... from the menu. Create a new name for the project and click on Save.

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6. Example Source Code

Example source code, libraries, and register definition files are provided in the “SiLabs\MCU\Examples\Modem”
directory during IDE installation. These files may be used as a template for code development. Example
applications include an HTTP web server, SMTP mail client, TCP echo client/server, and UDP echo client/server.
See "Appendix A—Protocols Supported by the TCP/IP Configuration Wizard" оп page 24 for a short description of
each protocol supported by the TCP/IP Configuration Wizard. Each of these examples were created using the
TCP/IP Configuration Wizard.

6.1. HTTP Web Server

The example project HTTPwsp, located by default in the “SiLabs\MCU\Examples\Modem\HTTP” directory,
configures the embedded modem to act as an HTTP web server. The modem places an outgoing call and
establishes a PPP connection with the PC. The number that the modem dials is defined as MODEM DIAL in
mn userconst.h. The number must be in the format “АТОТ#\г” (where ЯҒ is the phone number of the PC's modem
with no spaces or dashes). The PC must be configured to accept incoming connections (See "Appendix B—
Connecting the Embedded Modem to a PC" on page 25). The user can specify the modem's IP address
(IP SRC ADDR in mn userconst.h) or the PC can be configured to assign an IP address to the modem. To
establish a PPP connection, the variables pap user and pap pwd in main.c must match the username and
password of one of the user profiles on the PC. Once the PPP connection has been established, the user can type
"http WXXX.XXX.XXX.XXX" (where XXX.XXX.XXX.XXX is the IP address of the modem) into а web browser to
view а “Hello World" HTML document served by the embedded modem.

Note: HTML files can be converted to C files using the HTML2C.exe utility located by default in the
“SiLabs\MCU\Witilities\HTML2C” directory.

6.2. SMTP Mail Client

The example project SMTP.wsp, located by default in the “SiLabs\MCU\Examples\Modem\SMTP” directory,
configures the embedded modem to act as an SMTP mail client. The modem places an outgoing call and
establishes a PPP connection with the PC. The number that the modem dials is defined as MODEM DIAL in
mn userconst.h. The number must be in the format “АТОТ#\г” (where ‘# is the phone number of the PC's modem
with no spaces or dashes). The PC must be configured to accept incoming connections (See "Appendix B—
Connecting the Embedded Modem to a PC" on page 25). The user can specify the modem's IP address
(IP SRC ADDR in mn userconst.h) or the PC can be configured to assign an IP address to the modem. To
establish a PPP connection, the variables pap user and pap pwd in main.c must match the username and
password of one of the user profiles on the PC. Once the PPP connection is established, the modem will send two
emails to the SMTP server at the address defined by ІР SMTP ADDR in mn userconst.h. The SMTP server will
then forward those emails to the email address defined by the variable to[] іп main.c. One email has a text file
attached, and the other has no attachments.

6.3. TCP Echo Client/Server

The example project TCP.wsp, located by default in the “SiLabs\MCU\Examples\Modem\TCP\firmware’” directory,
configures the embedded modem to act as either a TCP echo client or a TCP echo server. To place the modem in
server mode, change the value of variable SERVER MODE to 1 in main.c. To place it in client mode, change
SERVER MODE to 0. The user can specify the modem's IP address (ІР SRC ADDR in mn userconst.h) or the PC
can be configured to assign an IP address to the modem. To establish a PPP connection, the variables pap user
and pap рма in main.c must match the username and password of one of the user profiles on the PC.

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In client mode, the modem places an outgoing call and establishes a PPP connection with the PC. The number
that the modem dials is defined as MODEM DIAL in mn userconst.h. The number must be in the format "ATDT?Ar"
(where # is the phone number of the PC's modem with no spaces or dashes). The PC must be configured to
accept incoming connections (See "Appendix B—Connecting the Embedded Modem to a PC" on page 25). To run
the example, first run the ТСР Echo Server application ("..ModemW CPMApplicationTCP SVR.exe") on the PC
and then start running code on the C8051F120. Once the PPP connection is established, ТСР SVR will wait for
the embedded modem to send a string, then echo the received string back to the embedded modem. The
embedded modem will then take the string Тот ТСР SVR and send it back and so forth.

In server mode, the modem waits for an incoming call from the PC before establishing a PPP connection. The PC
must be configured to make an outgoing call to the modem (See "Appendix B—Connecting the Embedded Modem
to a PC" on page 25). To run the example, first run code on the С8051Ғ120 and then initiate а call from the PC.
Once а РРР connection has been established, run the TCP Echo Client application
(“..\WModem\TCP\Application\TCP_CLI.exe’) on the PC. By default, ТСР СИ will send data to 216.233.5.26. If the
embedded modem is using a different IP address, execute TCP_CLI from the command line using this syntax:

TCP_CLI XXX.XXX.XXX.XXX
where ХХХ.ХХХ.ХХХ.ХХХ is the IP address of the embedded modem.

TCP_CLI will send out a string and wait for the embedded modem to echo it back. TCP_CLI will then take the
received string and send it to the embedded modem and so forth.

6.4. UDP Echo Client/Server

The example project UDP. wsp, located by default in the “SiLabs\MCU\Examples\Modem\UDP\Firmware’ directory,
configures the embedded modem to act as either a UDP echo client or a UDP echo server. To place the modem in
server mode, change the value of variable SERVER MODE to 1 іп main.c. To place it in client mode, change
SERVER_MODE to 0. The user can specify the modem’s IP address (IP_SRC_ADDR in mn_userconst.h) or the PC
сап be configured to assign an IP address to the modem. To establish a PPP connection, the variables рар user
and pap_pwd in main.c must match the username and password of one of the user profiles on the PC.

In client mode, the modem places an outgoing call and establishes a PPP connection with the PC. The number
that the modem dials is defined as MODEM DIAL іп mn userconst.h. The number must be іп the format “АТОТ#\г”
(where # is the phone number of the PC's modem with no spaces or dashes). The PC must be configured to
accept incoming connections (See "Appendix B—Connecting the Embedded Modem to a PC" on page 25). To run
the example, first run the UDP Echo Server application (“..\Modem\UDP\Application\UDP_SVR.exe”) on the PC
and then start running code on the C8051F 120. Once the PPP connection is established, ООР SVR will wait for
the embedded modem to send a string, then echo the received string back to the embedded modem. The
embedded modem will then take the string from ООР SVR and send it back апа so forth.

In server mode, the modem waits for an incoming call from the PC before establishing a PPP connection. The PC
must be configured to make an outgoing call to the modem (See "Appendix B—Connecting the Embedded Modem
to a PC" on page 25). To run the example, first run code on the C8051F120 and then initiate a call from the PC.
Once a РРР connection has been established, run the UDP Echo Client application
(“..\Modem\UDP\Application\UDP_CLI.exe”) on the PC. By default, ООР CLI will send data to 216.233.5.26. If the
embedded modem is using a different IP address, execute UDP_CLI from the command line using this syntax:

UDP CLI XXX.XXX.XXX.XXX
where XXX.XXX.XXX.XXX is the IP address of the embedded modem.

UDP CLI will send out a string and wait for the embedded modem to echo it back. UDP CLI will then take the
received string and send it to the embedded modem and so forth.

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7. TCP/IP Configuration Wizard

The TCP/IP Configuration Wizard, shown in Figure 5, generates supporting directory structure and framework

code required to start a new TCP/IP project. The wizard generates a custom library that describes the selected
protocol configuration. То start using the code generated by the wizard, open the TCPIP Project.wsp file using the

Project2 Open command from the Silicon Laboratories IDE. See application note “AN237: TCP/IP Library

Programmer's Guide" for detailed information about the TCP/IP stack.

Note: The CMX Micronet™ protocol stack is only licensed for use on Silicon Laboratories, Inc. MCU devices.
Contact the Silicon Laboratories MCU support team at www.silabs.com for any questions or problems using the

TCP/IP Library.

терр Configuration Wizard o
Ele Help

= Hardware Settings
T Communication Adapter

C] Use Password
= Protocol Settings
TG Link/Physical Layer
О РРР
Г] РАР
L] SLIP
15 Internet Layer
IP
PING
ARP
+ Transport Layer
Г] ТСР
ПП ШОР
+ Application Layer
[] FTP
L] HTTP
L] SMTP
Г] TFTP
= System Settings
TG Virtual Files
@ Sockets
(D SYSCLK
T IP Addresses

г Settings

UART Baud Rate:

[307200
Update UART Baud Rate |

Country Codes:

| United States -]

Protocol:

Гм 30 with automatic fallback |

Dutgoing phone number:

—

No dashes or spaces [e.g., 5551234].

r Code Size

Used Space: | 32 KB
Free Space: | 96 КВ

Figure 5. ТСРЛР Configuration Wizard

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8. C8051F120 Target Board

The Embedded Modem Development Kit includes a target board with a C8051F120 device pre-installed for
evaluation and preliminary software development. Numerous input/output (І/О) connections are provided to
facilitate prototyping using the target board. Refer to Figure 6 for the locations of the various І/О connectors. For
further details, see the “С8051Ғ12х Development Kit User's Guide" located on the kit CD or installed by default in
the “C:\SiLabs\MC U\Documentation\Users Guides" directory.

Power connector (accepts input from 7 to 15 VDC unregulated power adapter)

Connects SW2 to P3.7 pin

Connects LED D3 to P1.6 pin

JTAG connector for Debug Adapter interface
DB-9 connector for UARTO RS232 interface
Connector for UARTO TX (РО.0)

Connector for UARTO RTS (Р4.0)
Connector for UARTO RX (РО.1)

Connector for UARTO CTS (РА.1)

Analog loopback connector

Port 0—7 connectors

Analog I/O terminal block

VREF connector

VDD Monitor Disable

96-pin Expansion І/О connector

Port 5 Port 6 Port 3

Port 2 J3

Figure 6. C8051F120 Target Board

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9. AB3 Modem Adapter Board

The Embedded Modem Development Kit includes an adapter board designed to enable the C8051F 120 device on
the target board to communicate with the Si2457 modem device on the Si2457FT18-EVB Modem Board. This
adapter board provides several LEDs and switches for use in modem communications. Refer to Figure 7 for the
locations of the various I/O connectors.

J1 96-pin Expansion ИО connector

JP1 Connector for Si2457FT18-EVB Modem Board, modem signals
JP2 Connector for Si2457FT18-EVB Modem Board, phone line signals
УРА РСМ Interface connector

RJ11 Dual telephone jack

Д ЁД ЕЈ

SW1 SW2 SW3

Figure 7. AB3 Modem Adapter Board

®
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MODEM-DK

9.1. Switches and LEDs

Three switches are provided on the AB3 Modem Adapter Board. They are connected to C8051F120 GPIO (general
purpose ИО) pins through the J1 96-pin connector. Pressing SW1, SW2, ог SW3 generates a logic low signal on
the port pin. See Table 1 for the port pins corresponding to each switch.

Nine LEDs are also provided on the adapter board. Two LEDS, one red and one green, are provided as general
purpose indicators. These LEDs are connected to C8051F120 GPIO pins through the J1 96-pin connector. Seven
LEDS, one red and six green, are provided as modem signal indicators. These LEDs are connected to C8051F 120
GPIO pins that are used for modem signals to the Si2457 on the modem board. See Table 1 for the port pins
corresponding to each LED.

Table 1. Target Board I/O Descriptions

Description ПО
SW1 P3.4
SW2 P3.5
SW3 P3.6

LED1 (green) P3.2

LED2 (red) P3.3
ESC (red) P3.1

DCD (green) P1.1

RTS (green) P2.7

RXD (green) РО.7

TXD (green) P0.6

CTS (green) P1.0

RI (green) P1.2

9.2. PCM Interface (JP4)

The $12457 РСМ interface is available on JP4. Table 2 lists the pin connections for JP4 designed to connect
directly to the Si3000SSI-EVB JP6.

Table 2. JP4 Connector Pin Descriptions

РА Pin|AB3 Board Signal $12457 Pin Si2457 Signal
1 CLKOUT 3 CLKOUT
2 TXCLK 4 FSYNC
3 GND 6, 20 GND
4 GND 6, 20 GND
5 RXCLK 24 SDO
6 EESD 18 SDI
7 RESET 12 RESET
8 3.3 V 5,21 VD3.3
9 GND 6, 20 GND
10 3.3 V 5,21 VD3.3

&
14 Rev. 0.2 єго

SILICON LABORATORIES

MODEM-DK

9.3. Modem Board Connectors (JP1, JP2)

The AB3 Modem Adapter Board motherboard connects to the Si2457FT18-EVB Modem Board through two
connectors, JP1 and JP2. JP1 is an 8x2 socket providing connection to all Si2457 digital signals and regulated
3.3 V power for the $12457. The 512457 digital signals appearing at JP1 (modem board interface) are LYCMOS
and TTL compatible. JP2 is a 4x1 socket providing connection between the modem board and the RJ11 phone
jack. See Table 3 and Table 4 for JP1 and JP2 pin descriptions.

Table 3. JP2 Connector Pin Descriptions

Pin # Description
1 TIP
2 RING
3,4 NC

Table 4. JP1 Connector Pin Descriptions

$i2457 Pin
Descriptions

C8051F120 Pin Descriptions

Serial
Interface

CLKOUT

EEPROM
Interface

PCA
Interface

P1.4 (CEX4

Serial
Interface

P2.0 (SYSCLK)

Parallel
Interface

Р6.0 (А0)

ЕЕРКОМ
Interface

P0.5 (NSS)

RXCLK

P1.5 (CEX5

P7.5 (Data Bus

P0.2 (SCK)

TXCLK

P1.3 (CEX3

P2.6 (TXCLK)

P7.6 (Data Bus

DCD

P1.1 (CEX1

RTS

Р2.7 (RTS)

(
P7.4 (Data Bus
P7.7 (Data Bus

GND

RXD

P0.7 (RXD)

P4.6 (RD)

ESC

P3.1 (GPO)

P7.3 (Data Bus)

TXD

РО.6 (TXD)

P4.7 (WR)

P7.2 (Data Bus)

P0.4 (MOSI),
P0.3 (MISO)

P6.7 (CS)

P7.1 (Data Bus)

P3.7 (Reset)

P1.7 (/INT1)

P7.0 (Data Bus)

9.4. Dual Telephone Jack (RJ11)

The RJ11 dual telephone jack connector provides an interface from the Si2457 modem to a phone line. Refer to

Table 5 for pin definitions.

AINO.0 (AINO.0),
P3.0 (GPIO)

Р1.6 (/INTO)

Table 5. RJ11 Connector Pin Descriptions

G >

SILICON LABORATORIES

Pin # Description
1, 2, 5, 6, 7, 8, 11, 12 NC
3,9 TIP
4,10 RING
Rev. 0.2

MODEM-DK

9.5. Expansion ИО Connector (J1)

The 96-pin expansion I/O connector J1 is used to connect the AB3 Modem Adapter Board to the C8051F120
Target Board. J1 provides access to many C8051F120 signal pins. Pins for +3 V, digital ground, analog ground and
the unregulated power supply (VUNREG) are also available. The VUNREG pin is connected directly to the
unregulated *V pin of the P1 power connector. See Table 6 for a complete list of pins available at J1.

Table 6. J1 Pin Descriptions

Pin # Description Pin # Description Pin # Description
A-1 *3 VD2 (*3.3 VDC) B-1 DGND (Digital Gnd) C-1 XTAL1
A-2 MONEN B-2 P1.7 C-2 P1.6
A-3 P1.5 B-3 P1.4 C-3 P1.3
А-4 Р1.2 В-4 Р1.1 С-4 Р1.0
А-5 Р2.7 В-5 Р2.6 С-5 Р2.5
А-6 Р2.4 В-6 Р2.3 С-6 Р2.2
А-7 Р2.1 В-7 Р2.0 С-7 Р3.7
А-8 P3.6 B-8 P3.5 C-8 P3.4
A-9 P3.3 B-9 P3.2 C-9 P3.1
A-10 P3.0 B-10 РО.7 С-10 P0.6
A-11 P0.5 B-11 P0.4 С-11 P0.3
A-12 P0.2 B-12 PO.1 C-12 P0.0
А-13 P7.7 B-13 P7.6 C-13 P7.5
A-14 P7.4 B-14 P7.3 C-14 P7.2
A-15 P7.1 B-15 P7.0 C-15 P6.7
A-16 P6.6 B-16 P6.5 C-16 P6.4
A-17 P6.3 B-17 P6.2 C-17 P6.1
A-18 P6.0 B-18 P5.7 C-18 P5.6
A-19 P5.5 B-19 P5.4 C-19 P5.3
A-20 P5.2 B-20 P5.1 C-20 P5.0
A-21 P4.7 B-21 P4.6 C-21 P4.5
A-22 P4.4 B-22 P4.3 C-22 P4.2
A-23 P4.1 B-23 P4.0 C-23 TMS
A-24 TCK B-24 TDI C-24 TDO
A-25 /RST B-25 | DGND (Digital Gnd) C-25 VUNREG
A-26 | AGND (Analog Gnd) B-26 DAC1 C-26 DACO
A-27 CP1- B-27 CP1+ C-27 СРО-
А-28 СРО+ В-28 VREF C-28 VREFD
A-29 VREFO B-29 VREF1 C-29 AINO.7
A-30 AINO.6 B-30 AINO.5 C-30 AINO.4
A-31 AINO.3 B-31 AINO.2 C-31 AINO.1
A-32 AINO.O B-32 | AGND (Analog Gnd) C-32 AV+ (+3.3 VDC Analog)

&
16 Rev. 0.2 єго

SILICON LABORATORIES

MODEM-DK

10. Si2457FT18-EVB Modem Board

The Si2457FT18-EVB Modem Board includes a complete controller-based modem chipset with an integrated and
programmable direct access arrangement (DAA) that meets global telephone line requirements. This board is a
complete modem solution suited for use in an embedded system. The modem board requires a 3.3 V supply
capable of providing at least 35 тА and communicates with the system via LVCMOS/TTL-compatible digital
signals on JP1. When using the Embedded Modem Development Kit, the power supply and communication signals
are provided by the C8051F120 Target Board through the AB3 Modem Adapter Board. The RJ-11 jack is
connected via JP2. See Section 9.3 for JP1 and JP2 pin descriptions.

JP1 Connector for AB3 Modem Adapter Board, modem signals
JP2 Connector for AB3 Modem Adapter Board, phone line signals

512457

Figure 8. Si2457FT18-EVB Modem Board

&
e. э Rev. 0.2 17

SILICON LABORATORIES

MODEM-DK

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MODEM-DK

APPENDIX A—PROTOCOLS SUPPORTED BY THE TCP/IP CONFIGURATION

WIZARD

Link/Physical Layer:

SLIP (Serial Line Internet Protocol)—SLIP is a simple
protocol for sending TCP/IP packages along a serial
line. It provides no error-correction and requires that the
device on each end of the connection know the identity
of the device on the other end. SLIP is typically used on
low noise RS232 links between two fixed processors.

PPP (Point to Point Protocol)—PPP is a more robust
protocol for sending TCP/IP packages serially. PPP
provides error correction and provides multiple options
for configuring and connecting across a line. PPP is
commonly used to send TCP/IP packages across
modem lines.

PAP (Password Authentication Protocol)—PAP is a
sub-protocol of PPP which requires that the device
establishing the PPP connection supply a valid
username and password.

Internet Layer:

IP (Internet Protocol)—IP specifies the format of
packets and manages the addressing of all devices on
the network. IP is included in all builds of the TCP/IP
stack.

PING (Packet Internet Groper)—PING is a basic
network program which verifies that a particular IP
address exists and can respond to requests. PING is
included in all builds of the TCP/IP stack.

ARP (Address Resolution Protocol)—ARP converts
higher-level IP addresses to lower-level MAC
addresses. It is not available with SLIP or PPP.

Transport Layer:

TCP (Transmission Control Protocol)—TCP is а
connection-oriented transport protocol. It offers a
reliable, full-duplex data stream that may be written to
and read from by devices on the network.

UDP (User Datagram Protocol)—UDP is а
connectionless, unreliable transport protocol. It formats
data into units called datagrams and sends them across
the network; however, it provides no guarantee that the
data will arrive or that it will be error-free.

Application Layer:

FTP (File Transfer Protocol)—FTP transfers a
complete file from one network device to another. FTP
requires the TCP transport layer. The FTP module in the
TCP/IP stack configures the device to operate as an
FTP server only. It cannot act as an FTP client.

HTTP (HyperText Transfer Protocol)—HTTP sends
and requests files (typically HTML files) across a
network. It is commonly used to transfer files across the
World Wide Web. HTTP requires the TCP transport
layer. The HTTP module in the TCP/IP stack configures
the device to operate as an HTTP server only. It cannot
act as an HTTP client or browser.

SMTP (Simple Mail Transfer Protocol)—SMTP sends
and receives e-mails. It requires the TCP transport
layer. The SMTP module in the TCP/IP stack can only
act as an SMTP client. An SMTP server must be
available on the network to forward emails from the
MODEM-DK to the specified e-mail address.

TFTP (Trivial File Transfer Protocol)—TFTP is а
simplified version of FTP. It requires the UDP transport
layer. The TFTP module in the TCP/IP stack can only
act as a TFTP client. It cannot act as a TFTP server.

24 Rev. 0.2

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MODEM-DK

APPENDIX B—CONNECTING THE EMBEDDED MODEM TO A PC

The TCP/IP stack allows the embedded modem to be Configuring the PC to Dial the Embedded
configured as а client or server. The embedded modem Modem (Client Mode)

can communicate with any other modem through a
standard telephone line (POTS) or telephone simulator.
Any PC running Windows 2000 or Windows XP that has
a modem can be configured to accept calls or dial into
the embedded modem.

Configuring the PC to Accept Calls (Server
Mode)

1. Go to the "Network Connections" dialog in the
Control Panel.

2. Click on "Create New Connection". The New
Connection Wizard should appear.

3. If using Windows XP, select “Setup ап
Advanced Connection" and click “Next”.

4. Select "Accept Incoming Connections" and click
"Next".

5. Place a check mark next to the modem name.

6. Select "Do not allow virtual private connec-
tions".

T. Place a check mark next to all user's who will
be allowed to use the modem.

8. Select Internet Protocol (TCP/IP) and click
"Properties". From this dialog, you can specify
the IP address configuration and provide or
restrict access to the local area network (LAN).
Providing the embedded modem access to the
LAN allows the embedded system to send e-
mail using the SMTP mail server on a corporate
network.

9. Click "Finish" to complete the connection.

1.

Go to the "Network Connections" dialog in the
Control Panel.

Click on "Create new connection". The New
Connection Wizard should appear.

Select "Connect to the Internet" and click
“Next”.

Select “Setup my connection manually” and
click “Next”.

Select "Connect using a dial-up modem" and
click “Next”.

Specify a name for the connection and click
"Next".

Specify the phone number of the embedded
modem.

Select the user's allowed to dial the connection.

Specify the user name and password used to
log into the embedded modem.

10. Click "Finish" to complete the connection.

&
e. э Rev. 0.2

SILICON LABORATORIES

25

MODEM-DK

DOCUMENT CHANGE LIST

Revision 0.1 to Revision 0.2
m Removed Section 9. USB Debug Adapter. See USB Debug Adapter User's Guide.

&
26 Rev. 0.2 єго

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MODEM-DK

NOTES:

G >

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Rev. 0.2

27

MODEM-DK

CONTACT INFORMATION

Silicon Laboratories Inc.
4635 Boston Lane

Austin, TX 78735

Tel: 1+(512) 416-8500

Fax: 1*(512) 416-9669

Toll Free: 1+(877) 444-3032

Email: MCUinfo@silabs.com
Internet: www.silabs.com

The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from
the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features
or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, rep-
resentation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation conse-
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