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Re: Identification of modules

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rickman wrote:

> Is that five bits each or five bits total?

Five bits each.

> Why do I need to know how many bits this uses?

Because that determines the space of possible solutions.
One bit would could be solved purely by digital means,
16 bits is beyond the capabilities of certain analog techniques.

 > I need to know how you plan to distinguish the board slots.

One option is that a designated pin carries a different voltage
level. The level is generated by an appropriate resistor divider
on the backplane, based on 1% parts.

The type of the board is identified exactly the same way, but
the divider is on the board.

>> Would require a complex backplane routing.
>
> "Complex"?  How do you define "complex"?

Anything that wouldn't fit on a board without vias
and the traces cannot be reinforced with wire.

A board composed of 18 parallel wide traces + 2 per-slot
dedicated lines is considered to be simple.

> I guess I still don't understand your system.  I don't see why any parts
> would need to be on the backplane.

Then how?

> Where are all the pieces?  Where is the CPU?  You still have not
> explained the limitations of your slot identification.  How will the
> board know which slot it is in?

 > Are you trying to identify the boards and positions to a central CPU 
or to the MCUs on each board?

To a central controller composed of 2 redundant CPUs. An MCU on board is 
optional and preferably avoided if possible.

	Best regards, Piotr

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Thread

Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 09:21 +0200
  Re: Identification of modules Don Y <blockedofcourse@foo.invalid> - 2017-03-31 01:31 -0700
    Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 10:36 +0200
      Re: Identification of modules Don Y <blockedofcourse@foo.invalid> - 2017-03-31 02:16 -0700
        Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 11:39 +0200
          Re: Identification of modules Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-03-31 11:32 +0100
            Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 12:59 +0200
          Re: Identification of modules Don Y <blockedofcourse@foo.invalid> - 2017-03-31 11:55 -0700
    Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 11:30 +0200
  Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 05:20 -0400
    Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 11:53 +0200
      Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 06:16 -0400
        Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 12:39 +0200
          Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 13:27 -0400
            Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 22:14 +0200
              Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 17:48 -0400
                Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-04-03 10:57 +0200
    Re: Identification of modules John Devereux <john@devereux.me.uk> - 2017-03-31 11:39 +0100
      Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 13:38 -0400
        Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 22:21 +0200
  Re: Identification of modules Joe Chisolm <jchisolm6@earthlink.net> - 2017-03-31 13:02 -0500
  Re: Identification of modules Tim Wescott <seemywebsite@myfooter.really> - 2017-03-31 16:18 -0500

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