[Cryptech Tech] Open JavaCard platform

[Joachim Strömbergson]

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Aloha!

Vicente Sanchez-Leighton wrote:
> Have you already chosen the family for the on-chip cores (ARM, MIPS,
> ...) ?

No. There aren't that many open cores to choose from.

OpenRISC is a LGPL licensed RISC core. The 32-bit version is mature and
has ben used in real world HW applications.

https://en.wikipedia.org/wiki/OpenRISC

LEON is a LGPL licensed SPARC implemntation that has also been used in
real HW applications.

https://en.wikipedia.org/wiki/LEON

AFAIK there are no open ARM implementations. The one I know, a student
project in Sweden was killed off by ARM pretty fast. There are a few
MIPS ones also. Don't know their implementation status.

IMHO should not force their users into a given architecture but be as
open as possible in terms of technology. What we need to do is decide on
bit and byte ordering, data bus widths etc. But those can always be
fixed with simple HW converter. For the reference/example designs we
will be using specific cores or companion MCUs (which could be an ARM
Cortex something). But if a user wants to use OpenRISC, Microblaze, a
hard ARM core, MIPS or x86 in a separate CPU that should all be possible.

Currently I'm not following any specific bus standard, but is pretty
close to WISHBONE, APB, CoreConnect - It is basically the interface for
a memory with 32-bit wide MSB data.

The HW designs are written in generic Verilog 2001 that don't explicitly
instantiate any hard macros. The HW should be implementable into any
FPGA as well as ASICs. The only thing that might have to change is the
reset which currently is synchronous which some ASIC designers don't
like. It is another Bikeshed in itself but both Altera and Xilinx
recommends synch reset so we go with that.

- -- 
Med vänlig hälsning, Yours

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