From kwi@lesti.hut.fi Tue May 12 22:14:47 1992 Received: from lesti.hut.fi by ucsd.edu; id AA18844 sendmail 5.64/UCSD-2.2-sun via SMTP Tue, 12 May 92 22:14:43 -0700 for brian Received: by lesti.hut.fi (5.65c/7.1/S-TeKoLa) id AA42958; Wed, 13 May 1992 05:14:40 GMT From: Kaj Wiik Message-Id: <199205130514.AA42958@lesti.hut.fi> Subject: Re: DSP2232 modems To: brian@UCSD.EDU (Brian Kantor) Date: Wed, 13 May 92 8:14:40 EET DST Cc: mimic@lesti.hut.fi (Jarkko Vuori) In-Reply-To: <9205121451.AA20497@ucsd.edu>; from "Brian Kantor" at May 12, 92 7:51 am X-Mailer: ELM [version 2.3 PL11] 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 jarkko@sally.hut.fi Thu Oct 15 12:46:47 1992 Received: from santra.hut.fi by ucsd.edu; id AA06339 sendmail 5.67/UCSD-2.2-sun via SMTP Thu, 15 Oct 92 12:45:28 -0700 for brian Received: from sally.hut.fi by santra.hut.fi (5.65c/8.0/TeKoLa) id AA26593; Thu, 15 Oct 1992 21:42:41 +0200 Message-Id: <199210151942.AA26593@santra.hut.fi> Received: by sally.hut.fi (16.8/16.2) id AA02085; Thu, 15 Oct 92 21:43:20 +0200 Date: Thu, 15 Oct 92 21:43:20 +0200 From: Jarkko Vuori To: beacker@mips.com, 76334.337@CompuServe.COM, barryc@devnull.mpd.tandem.com, rcocl@minyos.xx.rmit.oz.au, cmgit!rob@nluug.nl, barry@dgbt.doc.ca, FABSOLON%ESOC.BITNET@FINHUT.hut.fi, moises@asterix.fi.upm.es, erweka@cs.tu-berlin.de, wittlin@sci.kun.nl, aurs01!aurw6b!gingell@mcnc.org, brian@ucsd.edu, mayfield@itd.adelaide.edu.au, wkt@csadfa.cs.adfa.oz.au, dsp4@minnie.cs.adfa.oz.au, szikora%licr.ucl.ac.be@FINHUTC.hut.fi, harm@cs.rug.nl, toml@ziggy.sps.mot.com, jaervinen@bhajee.enet.dec.com, PSYXSG@otago.ac.nz, antsu@utu.fi, mattila@tik.vtt.fi, ple@tik.vtt.fi, tiger@sally.hut.fi, kwi@sally.hut.fi, mimic@sally.hut.fi 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 Jarkko.Vuori@hut.fi kwi@vipunen.hut.fi