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RE: [lpc2000] Re: LPC's w/ ENC28J60 for ethernet via SPI

2006-01-09 by Joel Winarske

> > Have you looked at the Atmel AT91SAM7X?
> 
> I took a brief look, but availability concerns me.  Actually, while
> getting into an alternate CPU discussion, I came up with an
> interesting silicon cost comparison for some of my options.  These
> prices below are based on single unit quantities priced via Digikey:
> 
> LPC2292                  $13.46
> CS8900A                   $8.36
> 256Kx16 SRAM              $4.41     Total:  $26.23
> 
> EP9302                   $16.14
> 64Mb (4Mx16) SDRAM        $5.67
> Micrel 10/100 PHY         $3.78
> 4Mb (512KB) SPI flash     $2.15     Total:  $27.74
> 
> Hmm, $26.23 for an ARM7TDMI @ 60MHz, 256KB flash, 512KB SRAM, 10mbps
> ethernet, vs. $27.74 for an ARM920T @ 200MHz, 512KB flash, 8MB SDRAM,
> 10/100 ethernet.  A whole $1.51 additional silicon cost.

In general:
Pricing solely based on single quantity is not realistic.  If you buy in low
quantities, then you get end of the food chain prices.  Some parts get
exponentially cheaper the higher the quantity, others reduce in a more
linear fashion.  If possible the goal is to stay away from the linear
pricing model.

Yes the Cirrus is a good value if that's what you need, and you're tooled to
handle high frequency designs.

The Infineon 10/100 ADM7001 PHY is ~$0.86 in qty of 2500...


Joel

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