[Cryptech Tech] PCB prototyping machine [Was: BCP prototyping machine]

[Joachim Strömbergson]

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Aloha!

Павел Шатов wrote:
> Current EIM arbiter implementation takes on average 12 BCLK cycles
> to transfer 32 bits of data over EIM. BCLK is now 33 MHz, so the raw 
> bandwidth is about 10 megabytes per second right now. This can be 
> increased if necessary by changing BCLK to 66 or 133 MHz and
> switching to separate address/data mode from multiplexed address/data
> mode.

We seem to be thinking in the same direction. ;-) Lets crank the EIM
interface up a bit for the alpha board without adding too much
complexity on the board design. Would you say that 32-bit data @ 66 MHz
is a reasonable target?

And yes, the way our use cases are there really isn't that big bandwith
requirements. Neither in writing of at all. But what we do kill us
pretty fast is latency. If we would use SPI for example we could
probably get enough bandwidth. But those mux-demux operstions back and
forth will add hundreds of CPU cycles just to get a 32-bit random data
word. Not good.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
========================================================================
 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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