First Start Minimig with FPGA-CPU!!!

[Lemmink]

Well apart from the question can it be done or not, has anyone looked at the priecetag ? Sheesh 495 $ !!!  :-o

[TobiFlex]

downix wrote:

I just finished checking this option out.  In a word, can't be done.  The EP2C35F672-C6 FPGA it utilizes only has 32,000 gates.  The MiniMig's FPGA is 400,000 and is 80% utilized.  In short, the chipset alone won't fit into the design.

You want to annoy me. Right? Check it again and figure out your error.

[alexh]

@downix

The EP2C35 FPGA on the DE2 has 32,000 LE's (CLB) and 4Mbyte RAM!!

The XC3S400 used on the original minimig board has 896 LE's and 288Kbyte RAM!

Which one do you think is better?

Read before posting ;-)

@Tobiflex
How did you manage to interface to SDRAM?? I guess you had to implement a FIFO with some sort of prefetch logic? Or clock it many times faster than the design. I think the reason Dennis used SRAM was to overcome the problems with the bursty nature of SDR SDRAM.

[asian1]

If someone mass manufacture Application Specific IC (ASIC) based on this FPGA CPU + modified Minimig, will there be a legal problem with Freescale?
(ie: patent/copyright infringement of 68K design)

>Cost US$ 495.
Is it possible to lower the cost using ASIC / Structured ASIC?
What is the minimum volume?

[Unit01]

Hi TobiFlex,

Great work you are doing much appreciated.

Could your design be used on the Trex prototype board? Cause they are like US $150

http://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=39&No=14&Revision=018&PartNo=1


http://www.symbos.de/trex.htm

24Mhz  Amstrad CPC design core!

Oh sorry you're using the DE2 board must have a bigger fpga my bad. Became too excited there  :oops:

John
 

[alexh]

Video output isnt suitable for Amiga

[Unit01]

oic that too thanks Alexh

[alexh]

It's only 4-bit aka 16 colours, you'd need 12-bit (4096) colours for OCS/ECS and 24-bit for AGA

[TobiFlex]

alexh wrote:
It's only 4-bit aka 16 colours, you'd need 12-bit (4096) colours for OCS/ECS and 24-bit for AGA

Thats not true.
The TREX-C1 Board and and the DE1 Board from Treasic use 4-bit per Color (4096). The DE2 Board use 8-bit per Color.
The TREX-C1 Board is to small for the Minimig. The DE2 Board is to expensive for the most people but its very nice for debugging the Core.
My goal is to use the DE1 Board for the Minimig. It cost 150$. But I must rewrite the SPIhost to use exteral RAM.

http://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=39&No=83

[downix]

alexh wrote:
@downix

The EP2C35 FPGA on the DE2 has 32,000 LE's (CLB) and 4Mbyte RAM!!

The XC3S400 used on the original minimig board has 896 LE's and 288Kbyte RAM!

Which one do you think is better?

Read before posting ;-)

I did read, just read the wrong column.  Sorry for that, but it did bring the topic back to life.  

But I still was unaware that there was a freely available 68000 core available out there.  If so, perfect system I'd have to say.

[jkonstan]

TobiFlex, a working soft 68K cpu sounds great.
I hope that you will share some of your development work with the rest of us. Keep up the good work !

 :-)

[Dennis]

Hi Tobiflex,

This is excellent news! This is just what I was hoping for by releasing the sources, active development to make Mimimig a better design. I have been seriously looking at the Trex C1 as an "easy" platform for the Minimig, but I can see why the DE1 would be better. Keep up the good work and keep us posted!

Dennis

[TobiFlex]

Hi Dennis,
I would like to make the source code also open source some day.
Viele Grüße
TobiFlex

[krize]

Great work!! Looking forward for more updates on this project!

[mumule]

TobiFlex wrote:

The TREX-C1 Board and and the DE1 Board from Treasic use 4-bit per Color (4096). The DE2 Board use 8-bit per Color.
The TREX-C1 Board is to small for the Minimig. The DE2 Board is to expensive for the most people but its very nice for debugging the Core.
My goal is to use the DE1 Board for the Minimig. It cost 150$. But I must rewrite the SPIhost to use exteral RAM.

Did you check out the digilent boards nexus and nexus2 ?
www.digilentinc.com

[mumule]

TobiFlex wrote:
Hi Dennis,
I would like to make the source code also open source some day.
Viele Grüße
TobiFlex

Any idea when ?
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