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Path: utzoo!watmath!clyde!caip!im4u!oakhill!dsp
From: dsp@oakhill.UUCP (DSP Account)
Newsgroups: net.arch,net.analog,net.dcom
Subject: Correction to DSP56200 Tech Summary Table I
Message-ID: <744@oakhill.UUCP>
Date: Fri, 8-Aug-86 13:38:57 EDT
Article-I.D.: oakhill.744
Posted: Fri Aug  8 13:38:57 1986
Date-Received: Sat, 9-Aug-86 11:17:31 EDT
Organization: Motorola Inc. Austin, Tx
Lines: 61
Keywords: sampling frequency and number of taps
Xref: watmath net.arch:3717 net.analog:984 net.dcom:2075

<shep siegel at datacube in 3200006@datacube writes>:

>Thanks for the post of the DSP56200. It is good to be able to read of
>new DSP chip architectures here in net.arch. I assume that the DSP56200
>is designed as a peripheral for the 56000.

>Table 1, listing the DSP56200 "performance figures" did not make any
>sense: It seems for a FIR filter application with, say, 32 taps,
>the maximum sampling frequency DECREASES as you add chips. This doesn't
>make any sense. Can anyone explain or correct?

thanks for catching this serious error in the table.  the correction is
below.

 
             TABLE I - DSP56200 Performance Figures

                            SINGLE CHIP
           --------------------------------------------
           |     Maximum Sampling Frequency (KHz)     |
           --------------------------------------------
           |                  |      Number of Taps   |
           |     Mode         |  32   64   128   256  |
           --------------------------------------------
           | FIR Filter       |  227  132   71   37   |
           | Adaptive Filter  |  123  69    37   19   |
           | Dual FIR Filters |  122  68    36   *    |
           --------------------------------------------

                            FOUR CHIPS
           --------------------------------------------
           |     Maximum Sampling Frequency (KHz)     |
           --------------------------------------------
           |                  |      Number of Taps   |
           |     Mode         |  128  256  512  1024  |
           --------------------------------------------
           | FIR Filter       |  222  132   71   37   |
           | Adaptive Filter  |  120  69    37   19   |
           --------------------------------------------

                           EIGHT CHIPS
           --------------------------------------------
           |     Maximum Sampling Frequency (KHz)     |
           --------------------------------------------
           |                  |      Number of Taps   |
           |     Mode         |  256  512  1024  2048 |
           --------------------------------------------
           | FIR Filter       |  204  132   71   37   |
           | Adaptive Filter  |  115  69    37   19   |
           --------------------------------------------

                          SIXTEEN CHIPS
           --------------------------------------------
           |     Maximum Sampling Frequency (KHz)     |
           --------------------------------------------
           |                  |      Number of Taps   |
           |     Mode         |  512  1024 2048  4096 |
           --------------------------------------------
           | FIR Filter       |  175  132   71   37   |
           | Adaptive Filter  |  105  69    37   19   |
           --------------------------------------------