On Fri, 21 Aug 2009, Gene Heskett wrote:
>>
>> for a standalone chip version I'd add a ring or R/C oscillator so it does
>> not need a separate clock
>
> Is there room in the cpld for that?
Yes,lots of room left. Currently design uses 48 of 72 cells and could be
squeezed into 36 (for $1.00 part if needed)
RC osc is only a few cells but current PCB has a
separate XTAL osc and RC osc (with 74HC14) So I'd need a new PCB for a builtin
RC osc. Ring osc needs no pins but has less predictable frequency
Design is fairly de-luxe: 15 count input filters, 8 selectable division ratios
(1 to 255 range) selectable index edge polarity. Lots of squeezing possible,
but I just did it in the simplest fastest way by copy+paste.
>
>> I think I only have one assembled CPLD card An I promised that to Steve B
>
> And how much trouble to assemble it, considering I have had a soldering iron
> in hand most of the last 60 years? Used to the fine point in an XYtronic
> bench iron, thermally controlled of course.
Should not be too hard, no fine pitch parts, smallest is 0805 resistors and
capacitors, most parts could be dropped (theres a selectable frequency RC osc,
a push button with debounce, a Xtal osc can (8pin half size) 4 LEDS, jtag
connector, 2 26 pin I/O connectors etc
With existing filter max encoder count rate is ~1/8 FOSC (FOSC up to 50 MHz or
so)
>
> If you make it standalone except for 5V and ground, I want two. Name the
> ransom & I'll have my bank send a check. :-)
CPLD is 3.3V power but 5V tolerant I/O. Seems to run fine on 2 AA cells or 5V
with two diode drops...
>
>> Peter Wallace
>> Mesa Electronics
>>
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>>
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>
>
> --
> Cheers, Gene
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Peter Wallace
Mesa Electronics
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