MiniMig with AGA

[Captain Case]

The memory bus of the Minimig runs at 7.09 MHz so it was the simplest solution. The CPU can access the bus every clock cycle if it's not used by the chipset DMA.


The 16-bit opcodes are executed one per clock cycle. The performance could be even better if the data bus was 32-bit wide.

 
According to timing analysis results both these cores can run up to 20 MHz on Spartan-3E. I will try to run the CPU twice the speed of the memory clock. And with a prefetch buffer to improve memory throughput.



24 MHz SPI, no DMA.

:rtfm: At 7.1 MHZ the bus speed would be 14.2 Mb/sec, or twice the speed of the A1200 chipmem bus: From that limitation, I wouldn't expect any significant performance gain over the current speeds. The Sysinfo speeds as indicated by Yacube  1.85..2,5 x A1200 correspond to that. Could a future Minimig AGA core perhaps take a bigger slice out of the 133 MHz DRAM bandwidth of the FPGA- replay board to allow for greater speeds (perhaps up to 68040-25 level) in the future?

[kolla]

Have another look Kolla :-)

Any updates tonight?

[trip6]

@Crom00 - Loriano has the hookup for plastics (because he does it for a living), maybe you two could collaborate or merge designs and base them on mini-itx form factor able to accomodate an internal power supply since MikeJ said the power hookup would be a 4 pin molex to the board... This would also go along with the ATARI ST theme, since it too had an internal power supply...

@MikeJ - Any chance of getting a metal backplane cutout for mini-itx made? This could help the case designers Crom00 and Loriano and lower the cost by one large pane of plastic... or give a whole host of standard mini-itx casing options to the mases that already exist and would only need a cutout metal backplane to be accomodate your board to them... Would seem to be pretty cheap to manufacture at any machine shop where they work with sheet metal.

[TheDaddy]

Any updates tonight?

Hi Kolla,

Next update this week-end...hopefully something more visible :-)

[Linde]

I'll second (third?) the backplate request. It would be nice to be able to put this in a case out of the box.

[mikej]

When I have the board in my hand I'll see if I can find a metal vendor who can stamp them out. I am not sure how accurate my CAD models of the connectors are. If I can just send one to a chinese vendor and say "may me one that fits that" it would be great.

The PCBs are delayed slightly as some components are on long lead time. The bare boards are in China and I am not at the moment, so we need to get reunited

I'll let you know as soon as I know.
/Mike

[mikej]

Still waiting for some components...
/Mike

[kolla]

Still waiting for some components...
/Mike

Thanks for info

[wizard66]

Still waiting for some components...
/Mike

The waiting is killing me ;-)
O well, nothing we can do about.
Thanks for the update keep us posted (beter give me a E-mail to order LOL )

[mikej]

I don't know why but some parts are on lead times of 2 months!
I'm trying to get enough samples to at least build the first few for testing while I wait for the rest of the bits.
I'll keep you posted.
/Mike

[tonyyeb]

I don't know why but some parts are on lead times of 2 months!
I'm trying to get enough samples to at least build the first few for testing while I wait for the rest of the bits.
I'll keep you posted.
/Mike

What are you missing?

[mikej]

A couple of semiconductors, mainly the DAC.I've got a few samples now.

I've released the schematic and board mechanicals

http://www.fpgaarcade.com

/MikeJ

[bbond007]

@Crom00 - Loriano has the hookup for plastics (because he does it for a living), maybe you two could collaborate or merge designs and base them on mini-itx form factor able to accomodate an internal power supply since MikeJ said the power hookup would be a 4 pin molex to the board... This would also go along with the ATARI ST theme, since it too had an internal power supply...

@MikeJ - Any chance of getting a metal backplane cutout for mini-itx made? This could help the case designers Crom00 and Loriano and lower the cost by one large pane of plastic... or give a whole host of standard mini-itx casing options to the mases that already exist and would only need a cutout metal backplane to be accomodate your board to them... Would seem to be pretty cheap to manufacture at any machine shop where they work with sheet metal.

In that case I suggest Loriano makes a mini A1000 case. I'd like the ability to slide a Solidtek ASK-3100SP mini keyboard under the case. I'm lucky enough to have a PS2 one.

That would be fantastic, thanks.

[amigadave]

MiniMigAGA core demo running on the FPGA Arcarde board looks great.  Is it really that fast, or did someone speed up the video playback on that YouTube video?  :lol:

[mikej]

In that case I suggest Loriano makes a mini A1000 case. I'd like the ability to slide a Solidtek ASK-3100SP mini keyboard under the case. I'm lucky enough to have a PS2 one.

That would be fantastic, thanks.

I need to update the dimension drawing. I'll remove the connector details and do a second drawing with the heights. I need this to make the ATX panel thingy.

/Mike

[ElPolloDiabl]

What connectors does it come with? Can you plug in an Amiga floppy?