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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.
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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.
©1998, CONEXANT SYSTEMS, INC.
Printed in U.S.A.
All Rights Reserved
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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.
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~RDCLK
TDCLK
XTCLK
TXD
V.24
SERIAL
DTE
INTERFACE
RXD
~RTS
~CTS
~DTR
~DSR
~RLSD
~RI
CLKIN**
CLOCK
CIRCUIT
XTLI**
XTLO**
CRYSTAL
CIRCUIT
~RLYA
~RLYB
RINGD
RXA
TXA
TELEPHONE
LINE
RIN
TXA1
TXA2
MICM
SPK
SPKMD
RS0-RS4
MICV/NC*
TELIN/NC*
SPKR
TELOUT/NC*
TELEPHONE LINE/
TELIN
TELEPHONE/
TELEPHONE
AUDIO INTERFACE TELOUT
LINE
INTERFACE
MIC
MIC/
SPEAKER
~READ
~WRITE
DATA BUS (8) D0-D7
ADDRESS BUS (5) A0-A4
HOST
PROCESSOR
DECODER
IRQ
~RESET
~CS
MODEM DATA PUMP
(MDP)
[R6785: 144-PIN TQFP
R6764: 100-PIN PQFP]
VGG (+5V OR 3.3V)
VCC (+3.3V)
VAA (+3.3V)
SR8OUT***
HOST
PROCESSOR
SR8IN***
SR4CLK***
SA4CLK***
AGND
DGND
POWER
SUPPLY
*
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.
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56000R/V.34ratesT4
33600
31200
28800
26400
24000
21600
19200
16800
14400
12000
9600
7200
4800
2400
14400
12000
9600
7200
4800
9600
9600
4800
2400
1200
1200
600
1200/75
0–300
4800
1200
0–300
1200/75
0–300
14400
12000
9600
7200
9600
7200
4800
4800
2400
300
–
7DEOH &RQILJXUDWLRQV 6LJQDOLQJ 5DWHV DQG 'DWD 5DWHV
&RQILJXUDWLRQ
V.90/K56flex PCM*
V.34 33600 TCM**
V.34 31200 TCM**
V.34 28800 TCM**
V.34 26400 TCM**
V.34 24000 TCM**
V.34 21600 TCM**
V.34 19200 TCM**
V.34 16800 TCM**
V.34 14400 TCM**
V.34 12000 TCM**
V.34 9600 TCM**
V.34 7200 TCM**
V.34 4800 TCM**
V.34 2400 TCM**
V.32 bis 14400 TCM
V.32 bis 12000 TCM
V.32 bis 9600 TCM
V.32 bis 7200 TCM
V.32 bis 4800
V.32 9600 TCM
V.32 9600
V.32 4800
V.22 bis 2400
V.22 bis 1200
V.22 1200
V.22 600
V.23 1200/75
V.21
Bell 208 4800
Bell 212A
Bell 103
V.23 1200/75
V.21
V.17 14400 TCM/V.333
V.17 12000 TCM/V.333
V.17 9600 TCM3
V.17 7200 TCM3
V.29 96003
V.29 72003
V.29 48003
V.27 48003
V.27 24003
V.21 Channel 23
Tone Transmit
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PCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
QAM
TCM
QAM
QAM
QAM
DPSK
DPSK
DPSK
FSK
FSK
DPSK
DPSK
FSK
FSK
FSK
TCM
TCM
TCM
TCM
QAM
QAM
QAM
DPSK
DPSK
FSK
–
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–
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
1800
1800
1800
1800
1800
1800
1800
1800
1200/2400
1200/2400
1200/2400
1200/2400
1700/420
1080/1750
1800
1200/2400
1170/2125
1700/420
1080/1750
1800
1800
1800
1800
1700
1700
1700
1800
1800
1750
–
6\PERO 5DWH %LWV6\PERO %LWV6\PERO
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7&0
8000
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
2400
2400
2400
2400
2400
2400
2400
2400
600
600
600
600
1200
300
1600
600
300
1200
300
2400
2400
2400
2400
2400
2400
2400
1600
1200
300
–
Dynamic
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
6
5
4
3
2
4
4
2
4
2
2
1
1
1
3
2
1
1
1
6
5
4
3
4
3
2
3
2
1
–
–
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
1
1
1
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
–
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3RLQWV
–
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
128
64
32
16
4
32
16
4
16
4
4
4
–
–
8
4
–
–
–
128
64
32
16
16
8
4
8
4
–
–
Notes:
1. Modulation legend:
TCM: Trellis-Coded Modulation
FSK: Frequency Shift Keying
2. Adaptive; established during handshake:
QAM: Quadrature Amplitude Modulation
DPSK: Differential Phase Shift Keying
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3. Models with fax support only.
4. Maximum data rate.
* RP56 models only.
** 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 Response1
Configuration
V.90, K56flex, V.34,
V.32 bis, V.32
V.33/V.17 Long
V.33/V.17 Short
V.29
V.27 4800 Long
V.27 4800 Short
V.27 2400 Long
V.27 2400 Short
V.22 bis, V.22,
Bell 212A
V.21
V.23, Bell 103
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.
Constant
Carrier
± 2 ms
N/A
N/A
N/A
N/A
N/A
N/A
N/A
± 2 ms
500 ms
210 ms
Controlled
Carrier
N/A
1393 ms2
142 ms2
253 ms2
708 ms2
50 ms2
943 ms2
67 ms2
270 ms
500 ms
210 ms
Turn-Off
Sequence3
N/A
15 ms4
15 ms4
12 ms
7 ms4
7 ms4
10 ms4
10 ms4
N/A
N/A
N/A
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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