[Cryptech Tech] Alpha board block diagram v0.001

[Joachim Strömbergson]

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Aloha!

Joachim Strömbergson wrote:
> Павел Шатов wrote:
>> I'm afraid, MAX3421E is not what we need. It is not a transceiver,
>> it is a Peripheral/Host controller. It does have SPI interface,
>> but this interface is used to communicate with its internal
>> registers, not to communicate with external system. I believe, what
>> we actually need is FT232R from FTDI or maybe CP2104 from SiLabs.

I've looked at the FT232R. One thing I don't like with the chip is that
it has an EEPROM programmable from the host side. And changing values in
the EEPROM affects the USB as well as the serial interface functionality.

The FT232H does not have internal EEPROM and is actually a simpler chip
even though it supports UART as well as a few other serial interfaces
(I2C, SPI or general FIFO). The performance is also a bit better when
used as UART interface.

- -- 
Med vänlig hälsning, Yours

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