[Coco] [Color Computer] USB Anyone?

[j_e_daggett]

--- In ColorComputer at yahoogroups.com, Phill Harvey-Smith <dragon at a...>
wrote:
> j_e_daggett wrote:
> > 

> > Beisdes most PLD chips are $0.75 to $1.25. The IDE interface that is
> > functional equivalent to the Glennside IDE takes only 26 macrocells of
> > a 9572 series CPLD. IT won't fit into a 9536 do to the lack of
pinouts. 
> 
> Would be interested in seeing the HDL code for that.
> 
****************
Phil 

It was so simple that I used schematic editor to do the circuit. I may
rewrite it in VHDL for the heck of it. 

****************
> > I still contend that one large CPLD device will beable to shrink the
> > board size significantly such that teh savings in board costs will
> > overide any extrra cost in the CPLD. It is a trade off. 
> 
> A CPLD also has the major advantage, thta if you get the logic wrong on 
> the first design (and in my experience of such things you almost 
> cirtainly won't get it completely correct first time), you can mostly 
> change it by changing the VHDL/Verilog that you program into the CPLD, 
> which saves you having to cut tracks, and rewire.
> 
> Another things to considder is that using a CPLD does not nesescrally 
> mean using surface mount, as for example the 9536, 9572 and 95103 are 
> alll available in PLCC, which is somewhat easier to work with. I have 
> done surface mount and whilst is's not a difficult to do as I initially 
> thought, PLCC/DIP is definatly easier :)
> 
> Phill.

*******

I am not afraid smd devices. I have worked with them nearly a quarter
century. T he hardest is the darn 20x40 chip caps and resistors. They
need a magnifying glass to read them.


james





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