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

[Павел Шатов]

On 26.02.2015 0:41, Joachim Strömbergson wrote:
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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?

Yes, this will simplify EIM arbiter a bit too. 66 MHz I/O is by all 
means possible in Spartan-6.

Speaking of Alpha Board. Joachim, what do you think about my idea to use 
CPU+RAM module from http://www.imx6rex.com/ ? If we use it, it will save 
us a great amount of time, because we will only have to develop a rather 
simple baseboard containing only power supply, an FPGA of our choice and 
mating connectors to accept this module.

The only problem is that EIM interface is not exposed on this module. It 
is not very difficult to modify it by removing unnecessary wires from it 
(HDMI, audio, UART, etc) and connection EIM pins instead. Maybe we can 
even ask authors of this module to make a customized version for us. For 
a fee maybe? They have rather user-friendly open source license.