On Sat, 20 Aug 2011, Chris Morley wrote:
> Date: Sat, 20 Aug 2011 04:29:20 +0000
> From: Chris Morley <[email protected]>
> Reply-To: EMC developers <[email protected]>
> To: EMC DEV <[email protected]>
> Subject: Re: [Emc-developers] 7i48 mux encoder numbering system
>
>
>
>
>
> > This would suggest that mux 6 was on top of 0 , 7 on 1 etc.
>>> Except for two things:
>>> -seems strange to have the mux encoder enable for 6 on the P3
>>> connector if 6 is actually on P2
>>
>> The muxed encoder pins A,B,I pins are numbered per encoder _pair_ so for
>> example MUXA0 is for encoders 0 and 1, and MUXA5 is for encoders 10 and 11
>> This means encoders 0 through 5 are on P2 and encoders 6 through 11 are on P3
>>
>> The encoder select numbers are chosen so that the Hostmot2 driver enables
>> them
>> at the proper point depending on the number of encoders enabled.
>>
>> For example with the bit file you are using, if any encoders are enabled, the
>> select signal on P2 will be enabled as an output, but only if 6 or more
>> encoders are enabled will the select signal on P3 be enabled.
>>
>
> Ok thanks Pete I will now correct PNCconf. I find the numbering system un
> -intuative
> but no problem now !
>
Well the pins are simply enumerated like all other HostMot2 pins, I would not
want to change this basic scheme. They are multiplexed so 2 logical encoders
are supported by each physical pin.
Choosing the first actual logical encoder on a connector as the one that
enables the per connector select signal is the simplest so far as giving a
hint to the driver as to which select signal needs to be driven for a given
number of muxed encoders enabled on the command line. I suppose this number
could have been associated with thr physical pin (so the second connector
select signal was #3) but thats seems a toss up to me
Peter Wallace
Mesa Electronics
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