Evaluation Kit for CMX868

EV8680

© 2000 Consumer Microcircuits Limited

5

UM8680/2

1.3

Quick Start

This section provides instructions for users who wish to experiment immediately with the evaluation

kit. A fuller description of the kit and its use appears later in this document.

1.3.1

Setting-Up

THE EV8680 COMES PRE-CONFIGURED WITH A CMX868 DIP DEVICE FOR OPERATION AT 5.0

VOLTS.

THE IDC HEADER, J2, HAS ALL 5 JUMPERS INSERTED TO PROVIDE ‘C-BUS’

CONTROL FROM THE ON-BOARD PIC.

An RJ11 (US style) phone jack, J1, is provided for 2-wire line connection. Power is connected via the

two-way socket, J5.

Attach the 9-way RS232 cable between connector J4 and the serial port of the PC.

Connect an

external modem/line simulator to the evaluation kit using a suitable RJ11 telephone cable (not

supplied).

1.3.2

Adjustments

The line matching components can be adjusted, as required (refer to CMX868 data sheet and ETAL

transformer recommendations). Telco-specific components may be added, as required.

1.3.3

Operation

The EV8680 Evaluation board allows the user to perform calling, answering and simple data transfer

with a suitable simulator or external third party modem (not supplied). The board also allows the user

to attach laboratory test equipment to perform simple CMX868 device evaluation tests i.e. current

measurement, tone generation and detection.

The board is controlled by the AT command set described in Section 1.6.3, by running a terminal

emulator program on the host PC.

A suitable emulator is the ‘Hyper Terminal’ program which

operates under Windows 95/NT systems. The EV8680 AT command set consists of Basic, Extended

and CML Specific commands.

The board has two modes of operation:

AT Command Mode

In this mode the command processor firmware is constantly checking to see if the user has typed a

valid AT command. When a valid command is received the firmware will execute that command.

While the firmware is operating in this mode, the user can instruct it to manually answer a call,

originate a call, go on/off hook, read/write to S-registers, issue CML specific AT commands, and

perform any number of other AT command functions.

The board always starts in AT Command mode after power is applied and board initialisation is

complete.

The CML specific AT commands allow the user to directly control the CMX868 device for evaluation

purposes.

Note, customer modified CMX868 device registers will be overwritten when Dial and

Answer AT commands are executed.