[BBC-Micro] Harddisc fakery using a microcontroller - back on topic - AVR, FPGA, & SD cards
jumbos.bazzar at btopenworld.com
Fri Dec 17 20:27:45 GMT 2010
----- Original Message -----
From: "Phill Harvey-Smith" <afra at aurigae.demon.co.uk>
>> Since single chip micros don't tend to make good bus interfaced
>> peripherals I was wondering if anybody had any experience with
>> AT94K10AL-25AJC. Its from the Atmel FP Slic family and is a FPGA with
>> an AVR core and can come in a 84 pin PLCC. I can get them for about
>> AUD30 but they also need their config ram for another $12, and I have to
>> buy 10 of each so its looking a bit pricy to start with.
>> The chip looks very nice for this sort of thing but the licensing for
>> the dev tools is some what draconian. Its free for a very short time,
>> after which I think its about $1200 a year.
> Yeah that is the major disadvantage I wish Atmel would get with it and
> release their PLD dev tools for free as Xilinx/Altera etc do, and as
> Atmel themselves do for the AVR etc.
How about a Xilinx Spartan using a Picoblaze processor, or even a Z80 or
6502 core, there's plenty of space left in an XC3S200A to put a core plus
other support logic, small ROM and RAM. Yes, you'd need to interface the bus
to 3.3v, but should be doable with a single LVTH162245, or two at the most
(I've not looked at how many signals needed). The other side (SD) is already
3.3v so no problem there.
More information about the bbc-micro