Re: Easy question re: TPU parameter RAM

According to the microcode, ERROR|TCR2_VALUE is indeed placed in 
register 6 on channel 15 so the $YFFFFC is correct.

Paul Helmuth wrote:

> All,
>
> I am trying to work with the PMM/PMA function(s) and have a simple
> question regarding the location of the ERROR/TCR2_VALUE parameter word.
>
> Referencing the Programming Note (TPUPN15B/D - for PMM), figure 3 (on
> page 5) shows some space between the PERIOD_LOW_WORD and the next
> parameter word (ERROR/TRC2_VALUE). In the left margin there is also
> some "strangeness" with the symbolic addresses.
>
> The first group of parameters are shown to be at a "sequential" (and
> apparently contiguious) series of symbolic addresses. As follows...
>
> $YFFFW0   REF_TIME | CHANNEL_CONTROL
> $YFFFW2   MAX_MISSING | NUM_OF_TEETH
> $YFFFW4   BANK_SIGNAL | ROLLOVER_COUNT
> $YFFFW6   RATIO | TCR2_MAX_VALUE
> $YFFFW8   PERIOD_HIGH_WORD
> $YFFFWA   PERIOD_LOW_WORD
>
> $YFFFFC   ERROR | TCR2_VALUE
>
> Note the switch from $YFFFWx to $YFFFFC.
>
> Is this a typo? Should that address for ERROR/TCR2_VALUE read $YFFFWC
> (this is where I would expect it to be)?
>
> The reason that I ask, is that I am running the function and don't see
> TCR2_VALUE changing (or ERROR for that matter).
>
> Sorry for the lengthy explanation, but I wanted to be clear about the
> point of confusion.
>
> Thanks very kindly in advance to anyone that can confirm the location
> of ERROR/TCR2_VALUE.
>
> -Paul


-- 
Eric McRae, Electro-Logic Machines, Inc.
511 Root St., Port Townsend WA, 98368
Phone/Fax: 360.379.0969, http://www.elmi.com



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