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Introduction

The CONEXANT

RP56LD, RP336LD, and RP144LD

Modem Data Pump (MDP) families support data/fax
modem, voice coding/decoding, optional full-duplex
speakerphone, and optional AudioSpan (Table 1). Low
voltage and low power consumption support portable
applications. Downloadable architecture allows upgrading
of MDP code from the host/DTE.

In V.90/K56flex mode (RP56), the MDP can receive data
at speeds up to 56 kbps from a digitally connected V.90-
or K56flex-compatible central site modem. These MDPs
take 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. The MDP can send upstream data at
speeds up to V.34 rates.

In V.34 data mode (RP56 and RP336), the MDP can
connect at the highest data rate the channel can support
from 33.6 kbps to 2400 bps with auto-fallback to V.32bis.

In V.32 bis mode, the MDP can connect at the highest
data rate the channel can support from 14.4 kbps to 4800
bps with optional auto-fallback to lower rate modulations.

Internal HDLC support eliminates the need for an external
serial input/output (SIO) device in the DTE for products
incorporating error correction and T.30 protocols.

Voice mode includes an Adaptive Differential Pulse Code
Modulation (ADPCM) voice coder and decoder (codec).
The codec compresses and decompresses voice signals
for efficient digital storage of voice messages. The codec
operates at 28.8k, 21.6k, or 14.4k bps (4-bit, 3-bit, or 2-bit
quantization, respectively) with a 7.2 kHz or 8.0 kHz
sample rate.

A voice pass-through mode allows the host to transmit
and receive uncompressed voice samples in 16-bit linear
form at 7.2 kHz, 8.0 kHz, or 11.025 kHz sample rate, or in
8-bit A-Law/µ-Law PCM form at 8.0 kHz sample rate.

SP models support position-independent full-duplex
speakerphone (FDSP) operation using a dual internal
integrated analog circuit to interface with the telephone
line and the audio input/out (i.e., a headset, handset, or a
microphone with external speaker).

SP models in 144-pin TQFP also support a 4-line voice
serial interface used to transfer 16-bit linear or 8-bit A-
Law/µ-Law PCM FDSP voice samples with acoustic echo
cancellation to and from the host.

SP models also support AudioSpan (analog simultaneous
audio/voice and data) operation at a data rate of 4.8 kbps.

The MDP operates over the public switched telephone
network (PSTN) through the appropriate line termination.

Features

Downloadable MDP code from the host/DTE

2-wire full-duplex

V.90 and K56flex (RP56 models)

V.34 (33.6 kbps) (RP56 and RP336 models)

V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21

Bell 212 and 103

2-wire half-duplex

V.34 fax, V.17, V.33, V.29, V.27 ter, and V.21 ch 2

Bell 208

Short train option in V.17 and V.27 ter

Serial synchronous and asynchronous data

Parallel synchronous and asynchronous data

Parallel synchronous SDLC/HDLC support

In-band secondary channel (V.34 and V.32 bis)

Automatic mode selection (AMS)

Automatic rate adaption (ARA)

Digital near-end and far-end echo cancellation

Bulk delay for satellite transmission

ADPCM voice mode (7.2 kHz or 8.0 kHz)

Voice pass-through mode (7.2 kHz, 8.0 kHz, or 11.025 kHz)

Full-duplex speakerphone (SP models)

Acoustic and line echo cancellation

Programmable microphone AGC

Microphone volume selection and muting

Speaker volume control and muting; room monitor

Voice serial data interface (144-pin TQFP, SP models)

16-bit linear or 8-bit A-Law/µ-Law PCM voice

samples

FDSP support with acoustic echo cancellation

AudioSpan (SP models)

ITU-T V.61 modulation (4.8 kbps data plus audio)

Handset, headset, or half-duplex speakerphone

TTL and CMOS compatible DTE interface

ITU-T V.24 (EIA/TIA-232-E) (data/control)

Microprocessor bus (data/configuration/control)

Dynamic range: -9 dBm to -43 dBm

Adjustable speaker output to monitor received signal

DMA support interrupt lines

Transmit and receive (16+128)-byte FIFO data buffers

NRZI encoding/decoding

511 pattern generation/detection

V.8 and V.8 bis signaling

V.13 signaling

Diagnostic capability

V.54 inter-DCE signaling

V.54 local analog and remote digital loopback

+3.3V operation with +5V tolerant inputs

+5V or +3.3V analog signal interface

Low power consumption:

Normal Mode = 260 mW; Sleep Mode = 40 mW

Low profile, small footprint package

100-pin PQFP or 144-pin TQFP

Meets PC Card Type II envelope requirements

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Information provided by CONEXANT SYSTEMS, INC. is believed to be accurate and reliable. However, no responsibility is assumed by CONEXANT for its use, nor
any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of
CONEXANT other than for circuitry embodied in CONEXANT products. CONEXANT reserves the right to change circuitry at any time without notice. This document
is subject to change without notice.

K56flex is a trademark of CONEXANT SYSTEMS, INC. and Lucent Technologies.
CONEXANT and "What's Next in Communications Technologies" are trademarks of CONEXANT SYSTEMS, INC.

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Technical Description

The MDP functional interface is illustrated in Figure 1.

Configurations and Rates

The selectable MDP configurations, signaling rates, and
data rates are listed in Table 2.

MD212F1 FID

RS0-RS4

CRYSTAL

CIRCUIT

XTLI**

XTLO**

TELEPHONE LINE/

TELEPHONE/

AUDIO INTERFACE

INTERFACE

TELEPHONE

LINE

~RLYA

~RLYB

RINGD

RIN

TXA1

TXA2

MICM

SPK

SPKMD

MICV/NC*

TELIN/NC*

TELOUT/NC*

RXA

TXA

VCC (+3.3V)

AGND

DGND

POWER

SUPPLY

HOST

PROCESSOR

DECODER

~CS

~READ

~WRITE

DATA BUS (8) D0-D7

ADDRESS BUS (5) A0-A4

~RESET

IRQ

MIC/

SPEAKER

SPKR

MIC

TELEPHONE

LINE

TELOUT

TELIN

V.24

SERIAL

DTE

INTERFACE

~RDCLK

TDCLK

XTCLK

TXD

RXD

~RTS

~CTS

~DTR

~DSR

~RLSD

~RI

MODEM DATA PUMP

(MDP)

[R6785: 144-PIN TQFP

R6764: 100-PIN PQFP]

VGG (+5V OR 3.3V)

CLOCK

CIRCUIT

CLKIN**

* PINS ARE INTERNAL NO CONNECT (NC) ON NON-SP MODELS.

** SEPARATE PINS FOR CLOCK AND CRYSTAL INPUT ON R6785 144-PIN TQFP WITH USE DETERMINED BY INPUT CONTROL SIGNAL;
R6764 100-PIN PQFP SUPPORTS CLOCK INPUT ONLY.

*** VOICE SERIAL INTERFACE SUPPORTED FOR R6785 144-PIN SP MODEL.

VAA (+3.3V)

HOST

PROCESSOR

SR8OUT***

SR8IN***

SR4CLK***

SA4CLK***

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V.90/K56flex PCM*

PCM

56000R/V.34ratesT4

8000

Dynamic

V.34 33600 TCM**

TCM

Note 2

33600

Note 2

V.34 31200 TCM**

TCM

Note 2

31200

Note 2

V.34 28800 TCM**

TCM

Note 2

28800

Note 2

V.34 26400 TCM**

TCM

Note 2

26400

Note 2

V.34 24000 TCM**

TCM

Note 2

24000

Note 2

V.34 21600 TCM**

TCM

Note 2

21600

Note 2

V.34 19200 TCM**

TCM

Note 2

19200

Note 2

V.34 16800 TCM**

TCM

Note 2

16800

Note 2

V.34 14400 TCM**

TCM

Note 2

14400

Note 2

V.34 12000 TCM**

TCM

Note 2

12000

Note 2

V.34 9600 TCM**

TCM

Note 2

9600

Note 2

V.34 7200 TCM**

TCM

Note 2

7200

Note 2

V.34 4800 TCM**

TCM

Note 2

4800

Note 2

V.34 2400 TCM**

TCM

Note 2

2400

Note 2

V.32 bis 14400 TCM

TCM

1800

14400

2400

128

V.32 bis 12000 TCM

TCM

1800

12000

2400

V.32 bis 9600 TCM

TCM

1800

9600

2400

V.32 bis 7200 TCM

TCM

1800

7200

2400

V.32 bis 4800

QAM

1800

4800

2400

V.32 9600 TCM

TCM

1800

9600

2400

V.32 9600

QAM

1800

9600

2400

V.32 4800

QAM

1800

4800

2400

V.22 bis 2400

QAM

1200/2400

2400

600

V.22 bis 1200

DPSK

1200/2400

1200

600

V.22 1200

DPSK

1200/2400

1200

600

V.22 600

DPSK

1200/2400

600

V.23 1200/75

FSK

1700/420

1200/75

1200

V.21

FSK

1080/1750

0300

300

Bell 208 4800

DPSK

1800

4800

1600

Bell 212A

DPSK

1200/2400

1200

600

Bell 103

FSK

1170/2125

0300

300

V.23 1200/75

FSK

1700/420

1200/75

1200

V.21

FSK

1080/1750

0300

300

V.17 14400 TCM/V.333

TCM

1800

14400

2400

128

V.17 12000 TCM/V.333

TCM

1800

12000

2400

V.17 9600 TCM3

TCM

1800

9600

2400

V.17 7200 TCM3

TCM

1800

7200

2400

V.29 96003

QAM

1700

9600

2400

V.29 72003

QAM

1700

7200

2400

V.29 48003

QAM

1700

4800

2400

V.27 48003

DPSK

1800

4800

1600

V.27 24003

DPSK

1800

2400

1200

V.21 Channel 23

FSK

1750

300

Tone Transmit

Notes:

1. Modulation legend:

TCM: Trellis-Coded Modulation

QAM:

Quadrature Amplitude Modulation

FSK:

Frequency Shift Keying

DPSK: Differential Phase Shift Keying

2. Adaptive; established during handshake:

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4. Maximum data rate.
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** RP56 and RP336 models only.

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Automatic Mode Selection

When automatic mode selection (AMS) is enabled, the
MDP configures itself to the highest compatible data rate
supported by the remote modem (AUTO bit). Automode
operation is supported in V.90, K56flex, V.34, V.32 bis,
V.32 V.22 bis, V.22, V.21, V.23, Bell 212A, and Bell 103
modes.

Automatic Rate Adaption (ARA)

In V.90, K56flex, V.34, and V.32 bis modes, automatic
rate adaption (ARA) can be enabled to select the highest
data rate possible based on the measured eye quality
monitor (EQM) (EARC bit). This selection occurs during
handshake/retrain and rate renegotiation.

Tone Generation

The MDP can generate single or dual voice-band tones
from 0 Hz to 3600 Hz with a resolution of 0.15 Hz and an
accuracy of ± 0.01%. Tones over 3000 Hz are attenuated.
DTMF tone generation allows the MDP to operate as a
programmable DTMF dialer.

Data Encoding

The data encoding conforms to ITU-T recommendations
V.90, V.34, V.32 bis, V.32, V.17, V.33, V.29, V.27 ter,
V.22 bis, V.22, V.23, or V.21, and is compatible with Bell
208, 212A, or 103, depending on the model and selected
configuration.

RTS - CTS Response Time

The response times of CTS relative to a corresponding
transition of RTS are listed in Table 3.

Transmit Level

The transmitter output level is selectable from -4 dBm to
-19 dBm (VAA = +3.3V) or 0 dBm to -15 dBm (VAA = +5V)
in 1 dB steps and is accurate to ±0.5 dB when used with
an external hybrid. The output level can also be fine tuned
by changing a gain constant in MDP DSP RAM. The
maximum V.34/V.32 bis/V.32 transmit level for acceptable
receive performance should not exceed -9 dBm.

Note: In V.34 mode, the transmit level may be
automatically changed during the handshake. This
automatic adjustment of the transmit level may be
disabled via a parameter in DSP RAM.

Transmitter Timing

Transmitter timing is selectable between internal
(±0.01%), external, or slave.

Scrambler/Descrambler

A self-synchronizing scrambler/descrambler is used in
accordance with the selected configuration.

Answer Tone

When the NV25 bit is a zero, the MDP generates a 2100
Hz answer tone at the beginning of the answer handshake
for 5.0 seconds (V.8) or 3.6 seconds (V.32 bis, V.32, V.22
bis, V.22, V.23, and V.21). The answer tone has 180°
phase reversals every 0.45 second to disable network
echo cancellers (V.8, V.32 bis, V.32).

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RTS-CTS Response

Configuration

Constant

Carrier

Controlled

Carrier

Turn-Off

Sequence

V.90, K56flex, V.34,
V.32 bis, V.32

± 2 ms

N/A

V.33/V.17 Long

N/A

1393 ms

15 ms

V.33/V.17 Short

N/A

142 ms

15 ms

V.29

N/A

253 ms

12 ms

V.27 4800 Long

N/A

708 ms

7 ms

V.27 4800 Short

N/A

50 ms

7 ms

V.27 2400 Long

N/A

943 ms

10 ms

V.27 2400 Short

N/A

67 ms

10 ms

V.22 bis, V.22,
Bell 212A

± 2 ms

270 ms

N/A

V.21

500 ms

N/A

V.23, Bell 103

210 ms

N/A

Notes:

1. Times listed are CTS turn-on. The CTS OFF-to-ON

response time is host programmable in DSP RAM. (Full-
duplex modes only.)

2. Add echo protector tone duration plus 20 ms when echo

protector tone is used during turn-on.

3. Turn-off sequence consists of transmission of remaining

data and scrambled ones for controlled carrier operation.
CTS turn-off is less than 2 ms for all configurations.

4. Plus 20 ms of no transmitted energy.

5. N/A = not applicable.

Receive Level

The MDP satisfies performance requirements for received
line signal levels from 9 dBm to 43 dBm measured at
the Receiver Analog (RXA) (TIP and RING) input (-15
dBm at RIN).

Note: A 6 dB pad is required between TIP and RING and
the RIN input.

Receiver Timing

The timing recovery circuit can track a frequency error in
the associated transmit timing source of ±0.035% (V.22
bis) or ±0.01% (other configurations).

Carrier Recovery

The carrier recovery circuit can track a ±7 Hz frequency
offset in the received carrier.

Clamping

Received Data (RXD) is clamped to a constant mark
whenever the Received Line Signal Detector (~RLSD) is
off. ~RLSD can be clamped off (RLSDE bit).

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