Anyone with specs for old Hitachi components?

[Christian Hack]

Hi

If you find anything on the 46506 I would be very very interested.
My Nissan JECS ECU runs on a 6802 and sounds very similar
to what you're looking at. Mine has a 42pin DIP except it's 46510
which would have to be a damn close relation. Does your ECU
have JECS mentioned on it anywhere?

Mine also has a big 64 pin ASIC with pins spaced less than 0.1"
I take it yours doesn't.

I am sure from the disassembled code that one of these two chips
has a hardware multiply in it used for table interpolation.

Don't assume that because you know that one chip is a (P)ROM
that there won't be any others. My ECU has a 16kx8 (P)ROM but
also has a 1kx8 Bipolar PROM in it too. I don't know exactly what
it does but it only appears on the turbo charged engines ECU which
have a knock sensor. It's contents look like a table so I am guessing
that it is a lookup for the knock sensor or something.

Mine also has another NEC chip which appears to be RAM although
the code seems to use the internal RAM of the 6802 as well. Is yours
a 6802?

I take it a nerd novel is a databook right? I haven't come even close
to getting a datasheet in my searching. A guy emailed me once 
claiming that the 46510 was listed in an old Farnell catalogue and
he was trying to get a datasheet but he never came back to me 
with anything.

Christian

> 
> Date: Fri, 3 Nov 2000 16:18:03 -0800 
> From: "Buchholz, Steven" <Steven.Buchholz at kla-tencor.com>
> Subject: RE: Anyone with specs for old Hitachi components?
> 
> Thanks to all for the suggestions!  Perhaps I should have been a bit more
> clear in my original post ... I do know that the part is not a ROM device of
> some sort as there is a 2764 or 27128 device on the board.  I really doubt
> that EEPROM devices were available for general manufacture back in the early
> to mid '80s in any event.  No problem though, I welcome all hunches or leads
> I can get, and appreciate the folks who are taking time to help!  
> 
> I suspect this part is likely to be a companion chip to the microprocessor
> ... having I/O ports, timers, interrupt controller, perhaps a small bit of
> RAM and maybe even an A/D converter (given the application).  While I can't
> seem to find it in the Hitachi nerd novels I've dug up, the fact that I've
> seen the part used on several different versions of the controller box
> (dating from the mid to late '80s) I thought that perhaps there would be a
> data sheet with a register map somewhere out there ...
> 
> Thanks again!
> Steve Buchholz
> 
> > 
> > D2808C:  My failing memory says it is 8k EEPROM.
> > 
> > On Thu, 2 Nov 2000 23:01:42 -0800, you wrote:
> > 
> > >I have been hacking around inside some old ECUs for old Audi 
> > turbocharged engines which were built
> > >for Audi by Hitachi.  I have been able to acquire spec 
> > sheets and programming information for the
> > >microprocessors (MC680X-based), but there are a couple 
> > custom LSI devices for which I haven't been
> > >able to obtain any sort of information.  One part that does 
> > seem to be commonly used is a 42 (yes,
> > >that's right!) pin DIP which has a part number of D2808C on 
> > the cover, and another is a ceramic
> > >substrate with 52 pins and a label HD46506.  Both parts have 
> > Hitachi logos on them.  If anyone has
> > >any leads as to where I could get specs I would most 
> > certainly appreciate it!
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Christian Hack
DESIGN ENGINEER
christianh at pdd.edmi.com.au
EDMI Product Development Division
Ph : +61 7 3881 6444
FAX : +61 7 3881 6420


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