Thanks for the reply!

I realized four 8bit counters in the CPLD and just want to send this
information (4Byte) via the CAN-Bus, lets say all 100ms. Right know I am not
thinking wether this is the optimal solution but if it is possible without
an aditional uC (Project at university)
I will have a look if I can store enough information in the CPLD for the
initialization of the SJA1000 chip...

FalkS.

"Jim Granville" <[email protected]> schrieb im Newsbeitrag
news:mBCqd.13010$[email protected]..
> Falk Salewski wrote:
>> Thank you very much for your reply.
>>
>> However what I am looking for is how difficult is it to connect a CPLD to
>> a CAN-controller chip like the SJA1000
>> http://www-eu3.semiconductors.com/pip/SJA1000.html
>> and how many of the CPLD resources it takes to initialize/communicate
>> with this CAN-controller.
>
> You'll need to setup the registers [either a rom in the CPLD, or
> a Serial EE holding the init values, to BUS], and then be able to poll
> messages, and manage TX packets (which come from where ?).
>
> All of these are not CPLD-centric tasks, so why not use a small uC
> instead - or even better, choose a uC with CAN on chip ?
> If you have the XC2C256 there already, needing > 128 MC for other tasks,
> then you could use a small portion, for SPI-SJA1000 bridge, and then use a
> small SPI uC for the CAN manager/init.
> Philips LPC9xx or Silicon Labs C8051F33x series would do this, in tiny
> 11-20pin packages.
> -jg
>
>