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Re: tiny board

From	<698839253X6D445TD@nospam.org>
Newsgroups	sci.electronics.design
Subject	Re: tiny board
Date	2018-10-12 17:57 +0000
Organization	Aioe.org NNTP Server
Message-ID	<ppqna4$q0c$1@gioia.aioe.org> (permalink)
References	<0frqrdhr318tkcq2psfqpfj4e36eafcap8@4ax.com> <ppk6an$1vqi$1@gioia.aioe.org> <h7esrdl6ni0gbf3m0iutjn6uambclocetc@4ax.com> <ppliub$hb4$1@gioia.aioe.org> <l7ksrdt7ur1k4br3hh1mdb864f81m8ovn9@4ax.com>

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John Larkin wrote
>On Wed, 10 Oct 2018 19:12:10 GMT, <698839253X6D445TD@nospam.org>
>>Been coding a Linux test program for the LMX2332 PLL chip,
>>very hard to read datasheet,
>>could not register on TI site to download their windows program,
>>so writing my own.
>
>We had to develop c code to drive the LMX2571 synth chip. It has a 62
>page data sheet and about 4000 registers, and involves all sorts of
>rules and number-theory stuff. 
>
>TI wasn't any help. They obviously have procedures to go from
>frequency to register settings, and they obviously have c code in
>their eval kits, and they refused to let us see any of that.

I have the software framework running now, hard to find test vectors, 
but one thing bugs me in this chip:
there is one output pin that seems multiplexed to show different signals in the chip,
like outputs from different dividers etc...
But in the control registers you can set bits that connect more than one signal
at the same time to that pin.

So in theory it seems you can destroy the chip by sending the wrong config data.
That is very bad chip design IMO.

Maybe there is some protection, but then the datasheet is wrong.
So I added a software abort in case the wrong bits are set.

Thread

tiny board John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-09 20:22 -0700
  Re: tiny board <698839253X6D445TD@nospam.org> - 2018-10-10 06:30 +0000
    Re: tiny board tabbypurr@gmail.com - 2018-10-10 02:39 -0700
      Re: tiny board <698839253X6D445TD@nospam.org> - 2018-10-10 14:08 +0000
        Re: tiny board tabbypurr@gmail.com - 2018-10-10 08:34 -0700
    Re: tiny board DecadentLinuxUserNumeroUno@decadence.org - 2018-10-10 09:54 +0000
    Re: tiny board John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-10 07:43 -0700
    Re: tiny board John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-10 11:12 -0700
      Re: tiny board <698839253X6D445TD@nospam.org> - 2018-10-10 19:12 +0000
        Re: tiny board John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-10 12:26 -0700
          Re: tiny board <698839253X6D445TD@nospam.org> - 2018-10-12 17:57 +0000
            Re: tiny board John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 12:55 -0700
              Re: tiny board <698839253X6D445TD@nospam.org> - 2018-10-13 06:59 +0000
                Re: tiny board John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-13 08:54 -0700
                Re: tiny board <698839253X6D445TD@nospam.org> - 2018-10-13 18:19 +0000
  Re: tiny board George Herold <gherold@teachspin.com> - 2018-10-10 06:40 -0700
    Re: tiny board John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-10 07:38 -0700

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