QRZ! Ham Radio 1/QRZ Ham Radio Callsign Database - December 1993.iso/ucsd/packet/dsp/finland

Internet Message Format | 1992-10-15 | 5.2 KB

From [e-mail] Tue May 12 22:14:47 1992
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    Tue, 12 May 92 22:14:43 -0700 for brian
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From: Kaj Wiik <[e-mail]>
Message-Id: <[e-mail]>
Subject: Re: DSP2232 modems
To: [e-mail] (Brian Kantor)
Date: Wed, 13 May 92 8:14:40 EET DST
Cc: [e-mail] (Jarkko Vuori)
In-Reply-To: <[e-mail]>; from "Brian Kantor" at May 12, 92 7:51 am
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Status: RO

    Brian,

    You can find all the documents from funic.funet.fi
    pub/ham/dsp/packet/doc.zip. It is a compressed PostScript file
    containing schematics.

    We produced only a batch of 10 DSPCARD 3 beta-test boards. The design
    had an annoying memory problem, which can be cured with external
    ground and VCC planes. The board itself worked fine otherwise.

    Then we heard that Motorola will discontinue the production of
    56001 in ZL20 package we were using. Also the FLASH-EPROM technology
    and a vastly superior CODEC was going to be available. Because of
    these reasons we started to work on a new design, called DSPCARD 4
    (imaginative eh? :)).

    The highlights are listed below. After verifying
    and beta-testing the board we are going to let our club to produce a
    kit. The PCB layout and schematics plus all sources of the software
    (unlike    AEA and Grace :)) will be published by anonymous ftp.

    When this will happen? Well, I have just completed routing all
    connections between memories and the processor, so I would think
    that we get the board to testing phase during summer and it could
    be available in the fall. However as we do this mainly for our fun,
    we do not want to commit ourselves very much....

    73, Kaj OH6EH/2

    PS. These are not (yet?) plug-and-play boards. The available software
    is still quite limited. However we hope that due to the totally open
    design, some able programmers will get motivated...


------------------------------------------------------------------------------

DSP CARD 4 Technical Summary:
    E1 size (100mm * 160mm) four layer board

    Motorola DSP56001 Digital Signal Processor
        Maximum clock frequency depends on DSP type and SRAM speed,
        currently 27 MHz is maximum, 33 MHz with higher speed SRAMs

    Crystal CS4215 16-bit Stereo A/D & D/A Codec
        This chip contains line-level inputs and output, mic-level
        inputs and headphones driver. Maximum sampling rate is
        48 kHz.

    32 KW (96 KB) zero wait-state RAM
        Three 35 ns 32K*8bit SRAM chips

    32 KB FLASH EPROM
        With this EPROM the card can operate independently. FLASH
        EPROM can be programmed via serial line, so there is no
        need for tedious chip changing when revising the software.

    Optoisolated synchronous/asynchronous high-speed serial line
        Maximum datarate 114 Kbit/s, interface is RS232-type
        with MAXims new high-speed level-converters MAX232A.

    General purpose I/O
        Four protected general purpose inputs and eight
        buffered (via ULN2803) outputs available.

    Switched mode power supply
        Allows wide range input voltage (7 - 24 V), high
        efficiency and easy power generation for the isolated
        serial interface.

>     Brian Kantor

Kaj OH6EH/2



From [e-mail] Thu Oct 15 12:46:47 1992
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Date: Thu, 15 Oct 92 21:43:20 +0200
From: Jarkko Vuori <[e-mail]>
To: [e-mail], [e-mail], [e-mail],
        [e-mail], cmgit![e-mail], [e-mail],
        [e-mail], [e-mail],
        [e-mail], [e-mail],
        aurs01!aurw6b![e-mail], [e-mail],
        [e-mail], [e-mail],
        [e-mail], [e-mail],
        [e-mail], [e-mail], [e-mail],
        [e-mail], [e-mail], [e-mail], [e-mail],
        [e-mail], [e-mail], [e-mail]
Subject: DSP CARD 4 now working
Status: R

Finally we got DSP CARD 4 to work correctly. Now everything has been tested
and modified to operate correctly. Some errors have been detectedm and the
latest version (and the final version, hopefully!) is available at nic.funet.fi
directory /pub/ham/dsp/packet, file dsp4schema.zip.

Just now we begin to polish our software drivers for Crystal's codec and
interrupt based serial communications. After that we will begin to port
our DSP CARD 3 software to the new DSP CARD 4.

The new PCB layout may be available after two or three months, after which
there will, perhaps, available limited amout of beta test boards for DSP
fanatics. Of course all the design files will be available freely.

    Jarkko Vuori        Kaj Wiik
    [e-mail]    [e-mail]