Minimig Discussion Forum

New core for the Altera DE1 & DE2 released!

It's based on latest Yakube's version, and you're late getting this if you're the lucky owner of this nice new Altera Amiga

http://gamesource.groups.yahoo.com/grou ... g68/files/

get the file configDE1&2_release20.zip and get ready


I'm having problems myself with my Altera DE1 equipped with ZENTEL Ram chips. Maybe you have more luck while I try to fix mine!

Thats nice, thanks

New Minimig core for DE1 & DE2 released today: ARM controller support (without the ARM controller itself...)

Cool stuff
I guess there still is an IP Z80 working as PIC/ARM replacement?
Do the TG68 core also support 28MHz? If yes, how fast is it in Sysinfo V3.24?

The TG68 at 28MHz with the "fast" interface is 12x faster than a vanilla 68k, providing you can feed the beast with a continuous stream of instructions and data.
You need an instruction/data cache to achieve that performance since an SDRAM in pure random access has a minimum cycle time of 60-70ns (tRC value in an SDRAM datasheet). I do not know if Tobias has done it yet.
The Minimig does not have this kind of problem since it uses 10ns SRAMs.

Regards,

Frederic

If I do remember right, the TG68 core is working faster then the real 68000 because there is no machine cycle present to decode each instruction. Therefor even at 7.09MHz sysinfo points out a higher result compared to the real chip.
This also causes trouble in some (old) game/demo if the code suddenly runs faster then expected. Jens once told me the ip-cpu need some slowdown in this case (via idle loops) to match original cpu speed.

Dennis' Minimig V1.x design is based on 10ns S-RAM but ACube uses 45ns chips. Therefor the real cpu can not access the memory at full speed. Also the RAM chip IC7 get a bit warm if running FPGA64, due to faster timing then "allowed", but its still working.

Has anyone tried to switch the cpu frequency ?
The OSD selector only allows "normal" speed.

The DE1 version works nearly flawless for me. All adfs which aren´t possible to load in the past doing their job now.