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V.34 Modem
DATA PUMP REFERENCE DESIGN
OVERVIEW
The V.34 modem uses a 33-MIPS DSP to execute with no external memory required. Implementation requires only a single Analog Devices DSP to execute. Clock recovery and resampling is done entirely in software. This feature enables easy interfacing with a wide variety of codecs such as the AD1843. For digital modem implementations, no Codec is needed, since the sampling rate conversions can be done in software.
Hardware Architecture
All software executes from internal memory and can be loaded from an external storage device such as an EPROM or via the host interface. Under these circumstances, the architecture can support a DSP memory upload of 80K within 70 msec.
Host Processor
IDMA 512K x 8 EPROM (Optional) Serial NOVRAM 256K x 8 (Optional)
DSP 33 MIPS ser1 ser0
CODEC AD1843 (Optional)
DAA
Line
Software Architecture
Host
Host Control Interface
Kernel Control Interface
Kernel Digital Data Interface
Kernel Digital Data Interface
Kernel Analog Data Interface
DSP
Modem Core
The V.34 Modem Data Pump package consists of a relocatable modem core in object format. All interfaces to external systems such as host, Codec and bulk memory are available in source format for easy integration with user applications. Kernel drivers are available for the AD1843 codec and for direct ISDN connection at an 8 kHz PCM sampling rate.
A/D D/A
Kernel Bulk Management
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Analog. Digital. Solutions.
V.34 Modem
Boot Mechanism
The V.34 software is divided among several pages. Only one page is contained in the internal memory of the DSP at any given time. Page BOOT DIAL V22bis V32bis FAX FSK V8 INFO V34 PM 716 1832 6029 9408 6953 2881 2709 9265 13734 DM 683 1240 2249 12297 9501 1972 2521 7432 13375
Performance
45 40 Required SNR - dB 35 30 25 20 15 10 5 0 26400 24000 21600 19200 16800 14400 12000 9600 28800 7200 Competitor 1 Competitor 2 Competitor 3 ADI
Average Line (M1025) With Noise
Table 2
Table 1
competitors. From the graph, one can see that Competitor 3 will only connect at 28.8 Kbit/s, with 8 dB less noise and Competitor 2 cannot connect on this line at speeds higher than 16.8 Kbit/s.
Applications Include:
* Video conferencing * Cable modems * PC modems * Laptop Fax modems
Table 1 indicates the amount of memory used in words (three bytes for PM, two bytes for DM). From this table, the amount of memory left for user applications on each page can be deducted. The total amount of available memory is 16 KWord for PM space and DM space. Two boot cores are supported: * from EPROM * using IDMA for host download Table 2 shows a performance comparison between the ADI modem and three major
EUROPE HEADQUARTERS
Am Westpark 1-3, D-81373 Munchen, Germany Tel: +89 76903-0; Fax: +89 76903-557
Adding Applications
A major advantage of this solution is that other applications can be integrated with the modem software, even running concurrently on the same DSP. How large the application can be depends on which ITU recommendation is running concurrently. In V.34 operation a minimum of 4 MIPS is available on the DSP for other purposes. By reducing features, this number may be increased to 11 MIPS.
ADI Technology Partner
Telindus, a designer and manufacturer of high quality modems, is based in Belgium and licenses code to Analog Devices for sales with its chipset solutions.
Ordering Information
ADSST-MOD-2000 Includes DSP and V.34 Modem License ADSST-MOD-2010 Includes DSP and V.34 Modem License
WORLDWIDE HEADQUARTERS
One Technology Way, P.O. Box 9106 Norwood, MA 02062-9106, U.S.A. Tel: +1 781 461 3483, Fax: +1 781 461 4360 World Wide Web Site: http://www.analog.com
JAPAN HEADQUARTERS
New Pier Takeshiba, South Tower Building 1-16-1 Kaigan, Minato-ku, Tokyo 105-6891, Japan Tel: +3 5402 8200; Fax: +3 5402 1063
SOUTHEAST ASIA HEADQUARTERS
4501 Nat West Tower, Times Square Causeway Bay, Hong Kong, PRC Tel: +2 2506 9336; Fax: +2 2506 4755
a
Analog. Digital. Solutions.
PRINTED IN U.S.A.
H02160-.6-9/00(A)
50

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