minimig powersuply

[boing4000]

Minimig needs max. 150-200mA without PS/2 components.
With keyboard and mouse the PSU should provide at least stable 500mA. 1A and more are just for reserve and additional stabilizing.
Maximum power consume (200mA) is for about 1.5 sec while the FPGA is "booting". After uploading the firmware (minimig1.bin) the FPGA will internaly checksum the uploaded binary. this takes more power then normal operating but just for a short time.

[boing4000]

alexh wrote:
I still need to get a shaver adapter for mine. It arrived months ago and has still never been used.

Dont you have any other PSU for test? I also have one from an d-link router, it provides same polarity and voltage (5V) with the same plug into minimig.

In any case please check the polarity and output voltage at least once bevore plugging in! A bit too much or too little voltage will not directly harm but surtenly a negative polarity will.

[boing4000]

rkauer wrote:
 The board itself don't have 3.3 and 5V regulators? :-?

The board has regulators for 3.3, 2.5 and 1.25 Volts. The 5V from input are for the blue LED and to directly supply both PS/2 and joystick ports. All the other components on minimig are working at 3.3V. The FPGA is internaly working at 2.5 and 1.25V.

There are capacitor to stable voltages but the 5V source must also be stable enough to let minimig work fine.

[boing4000]

I dont know this PSU from Amigakit, but if this is a normal AC adapter it can handle some fluctuations in AC part. All this AC adapter do have some regulation and capacitor to support stable output voltages.
Minimig just need about a maximum of 200mA without PS/2 components. That is very few current and even with PS/2 the PSU easily should handle it :-)

Else many other ppl with Amigakit PSU should report problems. Until now I dont read anything about that.

[boing4000]

I dont know who wrote this, but this one never really measured the current. I did it using a laboratory power suppley. There is a maximum peek of 200mA only while the FPGA is booting (short after loading up the minimig1.bin and 1st reset).

In normal operation there is 135mA of current (FPGA and CPU active).
I could only get about 110mA without loaded FPGA core but this is non normal operation state. 100mA was never seen here :-)

Or just try to measure at your own minimig, perhaps it take more or even less mA... I can only say what I found out.

[boing4000]

That makes no different, The Amiga chipset is always working at "full speed", only some big blitter action could cause more heat in real (Fat)Agnus. In FPGA there is no more or less power consume if the Amiga is running a complex demo/game or just showing the kickstart hand.
The real 68000 cpu is also all time working, no halt-instruction will block it. This is doe to the minimig internal hardware design (Verilog).

Only when the PIC is operating (floppy drive simulation) the power consume could slightly rise about 45-50mA.

[boing4000]

Input 230V~ only (germany).
Output voltage is adjustable from 0V to 24V.
Ampere can manualy set to a maximum limit of 0mA to 800mA.
Both is displayed via digital numbers (0.2 sec update time).

[boing4000]

Yes I know that. The FPGA is working at a very low speed (28MHz) and could work up to 250MHz. All internal gates of all components are static switches (like S-RAM). The FPGA core is operating at 1.25V.
Depending on that the power consume will not grow much if some internel parts like blitter, copper, cpu etc. is active or inactive.
I did check it out but you can also do it by your self :-)