TG68 - The Open Source Minimig CPU into the FPGA

[TobiFlex]

eslapion wrote:
What really gets my attention with the Xess board is that it is said to be able to carry up to 1Million gates. The DE2's cyclon II is said to be limited to around 68000 (hey nice number...) logic elements.

You can't compare Gates with logic elements. On the xilinx webside i found this:
XC3S1000 = 17280 LC's
XC3S1200E= 19512 LC's
On Alteras Webside I found this:
EP2C20 = 18752 LC's (the DE1 Board chip)
EP2C35 = 33216 LC's (the DE2 Board chip)
The Minimig Core on the the DE1 Board use 13708/18752 = 73% of the Logic elements. It include Dennis Minimig Core, my TG68 Core and my Spihost with Z80 Core.
The complet Core will fit into all this chips.

Minimorph wrote:
Is this an Altera DE1 :-

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=544-1736-ND

Yes it is the DE1 Board!

Belial6 wrote:
If there is any testing I could do, and I could get the bitstream (?) files from you, let me know, and I will get a DE-1.

You can test Games and applikationen. If you like I send you the Bitstreamfiles.

Viele Grüße
TobiFlex

[TobiFlex]

MskoDestny wrote:
Out of curiousity, what's the "Spihost with Z80 Core" used for?

All what the PIC18 do on the Minmig do the DE1 with my spihost except the FPGA Config. I have take Dennis C-Code for the PIC and have it adapted for SDCC and the Z80.
So you don't need a PIC anymore.

[TobiFlex]

bloodline wrote:

ChaosLord wrote:
Why Z80 instead of 6502?

The Z80 was a better CPU than the 6502

Oh no! Please don't discuss that here!

[TobiFlex]

xmag32 wrote"
I think it would be cool to have the minimig running on the colour lcd

Yes it would be cool. But you cant here build a Joystick adapter an you need also the patch for the PS2 Conntector to use Keyboard and mice simultanos.

I think the best choose is the DE1 Board and this LCD Screen:
Terasic LCD Screen
or an other.

But I have no plans to do this next time.

[TobiFlex]

xmag32 wrote:
don't you think it might be possible to just misuse the rs232 connector for the amiga joystick. I dont'know how many pins of the connector are wired to the fpga.

No chance!
There is no direkt connection between rs232 connector and the FPGA. The rs232 ist connected to a Level Shifter. Remeber the rs232 signals are +/- 12V.
 

[TobiFlex]

xmag32 wrote:
Where did you connect pin2/6 of the ps2 connector on the DE2? And are there any spare pin headers on the board.

Now I have finish the doku for the MICE/JOYSTICK Adapter for the DE1 and DE2 Board.


EDIT:
Please wait for a new Schematic. Please check the Mice connector.

[TobiFlex]

MiniMorph wrote:
When the RTL is released I will find out for myself.

DE1 and DE2 Minimig complete Source Code is available now.
Look here:
minimigtg68 group

Viele Grüße
TobiFlex

[TobiFlex]

webmany wrote:
could you use the Nios II Embedded Evaluation Kit

I don't know. The Bitstream files for the DE1 and DE2 are ready to use. For the Nios II Embedded Evaluation Kit you must do it yourself.
The minimigtg68 is Open Source. Have a go at it!

Viele Grüße
TobiFlex