🚀 go-pugleaf

In article <4000@copper.Denver.Colorado.EDU> ssarmast@ucdacm.denver.colorado.edu (Sam Sarmast)  
writes:
>I'm beginning a project using a NeXTstation for real time digital
>signal processing and I'm having a little trouble finding
>information on how to interface an A/D board to the DSP port on the
>back of the   machine.  Anyone have any thoughts on where I could
>find such information? 

You typically need 4 wires like below to interface A/D's to the
DSP port.  Actual pin# for signals may vary depending on the
operating mode of the DSP (whether transmitter and receivers are
synchronized or not).  NeXT DSP port presents directly what comes
out of Port-C of DSP56001.  You should get the DSP56000/1 User's
Manual from Motorola for more detail.

;; DSP56001 signal name         NeXT DSP port(DB15) pin#
;; -----------------------------------------------------
;; SCK (SSI bit clock)           1
;; SRD (SSI received data)       2
;; SC2 (frame sync)              12
;; GND (ground)                  9, 10, 11, (15)

--
Izumi Ohzawa
USMail: University of California, 360 Minor Hall, Berkeley, CA 94720
Telephone: (510) 642-6440     Fax:  (510) 642-6341
Internet: izumi@pinoko.berkeley.edu (NeXT Mail OK)
r not).  NeXT DSP port presents directly what comes
out of Port-C of DSP56001.  You should get the DSP56000/1 Use

ssarmast@ucdacm.denver.colorado.edu (Sam Sarmast) writes:
>I'm beginning a project using a NeXTstation for real time digital
>signal processing and I'm having a little trouble finding information
>on how to interface an A/D board to the DSP port on the back of the
>machine.  Anyone have any thoughts on where I could find such information?

I took a look at the Motorola DSP56ADC16 converters - they have a 
56001 application in their data-sheet. 
What I don't understand (don't have my DSP Uman yet) is, if this is the
32 bit - network mode mentioned in MonsterScope and if this is usable 
with the SoundKit ?

Somebody at NeXT or some other 'enlighted' please (PLEASE) ?

Greetings, Bjoern


-- 
bkr@drdhh.hanse.de - Bjoern Kriews - Stormsweg 6 - D-2000 Hamburg 76 - FRG
"Advent, Advent das Holzbein brennt" - Weihnachtsbasteleien die Freude machen 

ssarmast@ucdacm.denver.colorado.edu (Sam Sarmast) writes:
>I'm beginning a project using a NeXTstation for real time digital
>signal processing and I'm having a little trouble finding information
>on how to interface an A/D board to the DSP port on the back of the
>machine.  Anyone have any thoughts on where I could find such information?

Well... I'm trying to make a A/D converter board for my NeXT and I
have had some nice info about A Burr-Brown A/D converter which
interfaces directly to the DSP (conversion time 5usec). Unfortunately
I lost the data-sheet and I can't give you the device number, until I
have another one...

Annard

P.S. Does anyone have a schematic diagram of a nice low pass filter
with a cut-off frequency of about 20kHz? :-)))
-- 
| Annard Brouwer                        Bitnet             : rcgbbaab@heitue51
| small-sized NeXT mail appreciated!    Internet           : rcbaab@urc.tue.nl