[sdiy] Small MCU MIPS, DMIPS?

[Noah Vawter]

On Mar 1, 2011, at 12:46 PM, Matthew Smith wrote:

> Quoth Noah Vawter at 02/03/11 02:29...
> ...
>> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ATF750C-10PU-ND
>> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ATF2500C-20PU-ND
>> smaller on is 24-pin dip 10 macrocell, 100 MHz.    $5.15
>> the larger one is a 40-pin dip, 24 macrocell. 50 MHz, $7.55
>> anyone use these?  mini-review?
>
> Haven't used those but, if you're looking for DIP for solderability,  
> Xilinx does a few CPLDs in PLCC packages - and they're not a lot  
> harder to solder than DIP, plus you don't have to muck around  
> drilling holes.

thanks for the hint.  I found these Xilinx CPLDs on DigiKey:

low-cost entry, beginning at $1.07 in single qty!  36 macrocell, 100  
MHz, 44-pin Jlead:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=122-1570-ND

maximum computational power:   $10-$14 qty 100-1, 108 Macrocell,  
66MHz, 84-pin Jlead:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=122-1460-ND

most bang for the buck:   $2.04 (only single qty available?) 72  
Macrocell, 	44-pin Jlead, 100 MHz
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=122-1466-ND


for reference purposes only cuz comparison is fishy due to a different  
chip, but from opencores:
- Adder - 385 CLBs - 87 MHz, 6-stage pipelined
- Multiplier - 119 CLBs - 90 MHz, 4-stage pipelined

so perhaps an almost single precision multiplier could fit into a $10  
cpld.... perhaps, but
adder looks harder :0

I also checked into FPGAs in Jlead format and found this at digikey:
Altera flex 8000A, 208 logic elements, 26 LABs/CLBs, 84-pin Jlead, $13
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=544-2251-5-ND