Mini-Mig Bill of Materials

[wizard66]

@ Dennis

Is it possible to put the vendors and part numbers behind the components on the bom list?
Just like in the list for the critical parts?
I think that save a lot of trouble for all and questions.

Just for example there is no where to find how much volts the capacitors must be!

[whiteb]

Guys, Digikey 122-1519-ND for the FPGA are back in stock, with 200 in store.

Lets see if us Amiga people can clean them out.  I just been chatting with them on their Webchat about it.

[koaftder]

wizard66 wrote:
@ Dennis

Is it possible to put the vendors and part numbers behind the components on the bom list?
Just like in the list for the critical parts?
I think that save a lot of trouble for all and questions.

Just for example there is no where to find how much volts the capacitors must be!

3.3 and 5v design. Pick ~20v caps. Look at the schematic, where it really matters he clearly states what v for caps in the schematic.

[hifibonsai]

Dennis wrote:

Does anyone have any idea if:

http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=122-1520-ND

is compatible (no changes to the rev1.1 pcb) with 122-1519-ND?
If it is just a matter of recompiling the core and maybe adjust it a little bit it might actually be worth it...

No, that part is not compatible!! The Spartan 3E is not pin compatible to the classic Spartan 3.

Dennis

Ciao,
Ok, thanks (and thanks for the minimig!). I was hoping that by disabling some of the components (for example I don't care about sound) it would have been possible to free the incompatible pins, but looks like it's not feasible.
Thanks anyways!

[whiteb]

Just a side track, has anyone got a fully compiled Minimig core ?

Dennis only has the Source on his website, which means it needs to be Compiled.

Same goes for Pic Controller Firmware.

Dennis said he would put them up on his Website, but I guess he is a bit busy at the moment.

Power, have we worked out the power requirements ? I know it is 5V But whats the Max current 1A ? (or something like that ?) I know that if it draws 500ma, then a 1A powerpack will be fine, i do not just want to UNDER SUPPLY the thing.

I want to make sure I have at least a variable Powerpack to get mine up and running.

[edit] I also noticed from the Schematic, that according to the LM1117 datasheet, they recommend a 10uF Capacitor on the Voltage input SOurce, but Dennis has a 100uF, my thought is by having a Capacitor that is 10 times the capacitance, he *REALLY* wants to eliminate noise on the board. (Which I can understand, Given that the chipset timings would be SEVERELY hampered by any noise.)

[freqmax]

But there is also two LM1117 linear regulators that use it. It does however not hurt with excess capacity.
I have noticed that +5V is unfiltered:
http://www.opencircuits.com/Image:Minimig_v10_board_main_pwr.png

[jkonstan]

whiteb wrote:
Just a side track, has anyone got a fully compiled Minimig core ?

Dennis only has the Source on his website, which means it needs to be Compiled.

I have created an ISE 8.1 project and compiled the Verilog into a .bit file for the Spartan3 FPGA. It took way over an hour on a 2Gz PC.

 :-)

[whiteb]

Oh right, so thats the file that the Microprogrammer uses to flash the FPGA right, because I cannot make any sense out of Xilinx ISE 9.2 software.  And i got a 2.1Ghz dual core.

And the Pic Firmware, I tried Hi-Tech Picc lite, but it appears to only support 16 series Pic's not Series 18.

[jkonstan]

That is Correct.
The bit file is the binary FPGA data. The bit file will need to be placed on an SD card for the PIC micrcontroller to read and download it serially into the Spartan3 FPGA.
 
:-)

[nBit7]

they recommend a 10uF Capacitor on the Voltage input SOurce, but Dennis has a 100uF, my thought is by having a Capacitor that is 10 times the capacitance, he *REALLY* wants to eliminate noise on the board.

The 100uF will only be good with low frequency ripple (something that the regulator is good at).  To get rid of noise ( due to input rejection ratio) you would need a low capacitance tantalum or ceramic (ie low ESR and ESL). Having a large reservoir cap is a good thing.  But ideally a 1uF to 10uF tantalum (or maybe a 100nF to 1uF ceramic) should back it up to provide for the high di/dt loads of this type of circuit.  With engineering there is always a trade off.  Higher capacitance tends to means lower performance in other areas.

[nBit7]

And the Pic Firmware, I tried Hi-Tech Picc lite, but it appears to only support 16 series Pic's not Series 18.

That's correct there is no free c compiler that supports the PIC18 series.

[whiteb]

Alrighty, so I am back to Hoping Dennis is not to busy to upload a pre-compiled version some time soon then

Care to share your compiled core ??

[jkonstan]

I can share the compiled core that was created from Xilinx ISE ; however, I did not check the final pin mappings for the Spartan3 which should be ok since I used Dennis's UCF file. The real issue is that I have no place to upload these files ....

  :-)

[whiteb]

You can email it to me or use a Free file share site, like Rapidshare.

I found a DEMO C compiler, that supports 18f252, but not 18LF252.  I test ran the compiler and its complaining about not finding hardware.h, which is not in the archive, yet main.c refrences to it.  See this is why i did not learn C

[wizard66]

whiteb wrote:
You can email it to me or use a Free file share site, like Rapidshare.

upload @ Rapidshare please so all can use it ! thanks

[whiteb]

This is only temporary until Dennis posts the Core and compiled PIC code on his site.

I would compile the core myself, if I actually knew what the Frag I was doing with the Xilinx software.