73M2901CLIH データシートの表示（PDF） - TDK Corporation

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73M2901CLIH

V.22bis Single Chip Modem

TDK Corporation 

FIRMWARE DESCRIPTION*

An “AT” command interpreter provides command

and configuration of the 73M2901CL. This provides

the user a uniform interface to control the modem in

embedded applications.

The signal processing is performed to provide data

to the DAC and process data from the A/D

converter. A MAC hardware coprocessor is provided

for computation.

To provide maximum flexibility, the system host

processor can access the internal RAM and Control

Register space in the modem. This will allow the

OEM user to modify parameters such as filter

response, transmit levels through the AT command

set using proprietary commands. The host processor

can also access the modem I/O port pins, providing

extended I/O capability.

FIRMWARE REQUIREMENTS

The modem always powers up in the idle (on hook)

mode. “AT” commands are issued via the serial

interface from the host. All modem configuration

commands are received in this manner. The data

modem firmware is contained in an internal ROM.

The firmware will automatically enter a power saving

idle mode if the modem is on hook and there are no

incoming host commands. The modem automatically

powers up upon receiving the next command. This

power up sequence occurs without delay to the host.

This function, while saving power, is transparent to

the host processor and can be disabled by the host

via an “AT” command. The host can also program

the modem to power down via external pin (DTR) or

via a firmware command.

73M2901CL

V.22bis Single Chip Modem

FIRMWARE FEATURES

• “AT” command set

• Supports data standards through V.22bis

• Provides DAA control firmware (e.g. ring detect,

hook control)

• Multinational Call progress support (FCC68,

CTR21, JATE, etc.)

• Caller ID capability

o FSK demodulation (V23 or Bell202)

o DTMF demodulation

o Intra 1st/2nd ring CID data operation

o Post Line reversal CID data

operation

• On hook Line-In-Use detection support (No line

seizure will occur when a Line-In-Use condition

is detected)

o Tip/Ring voltage sensing

o Quiescent line validation

• Off hook Parallel Pick-Up detection support

(Line seizure will be aborted as soon as a

Parallel Pick-Up condition is detected)

• Directly interfaces with standard V.24/EIA-232

bus drivers (3.3V inverted level) serial interface

using the built in serial port and firmware control

of port pins

• Provides tone generation and detection

including four imprecise and four precise call

progress detect filters with programmable

frequency and detection threshold

• Blacklisting capability

• Long Space disconnect

• Inactivity timeout

• Host access to program RAM provided

• User programmable general purpose I/O

* Refer to the TDK 73M2901CL User Guide for a complete description of the software.

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